STI 6-Speed Transmission Swap FAQ's
Ever since we made our first two videos about swapping an STI 6-Speed into either the GD WRX (2002 - 2007) or the GR WRX (2008 - 2014), there are a number of common question that we have received. This is something that we have wanted to circle back to for a while now, and since we were helping Tasso Koch from OTC Racing put an STI 6-Speed transmission into his Rally car, we decided that this would be the perfect time to revisit some of these topics.
Hopefully this video with the others that we have put up will be able to answer any questions you might have, and we also go over some new solutions that are available when it comes to the wiring that is involved, etc.
The main topics covered in this video are:
00:00 - STI 6-Speed Swap FAQ Intro
00:42 - What are the wiring options to connect the STI 6-Speed to my WRX?
01:38 - Can I install a newer STI 6-Speed without a speed sensor into an older WRX?
02:15 - Neutral Position and Reverse Switch wiring between 5-speed and 6-speed
03:55 - Clutch compatibility between the 5-Speed and 6-Speed Transmissions
05:11 - Which driveshaft do you need for the swap, and which Rear Differential Flange?
06:20 - What rear differential do I need to go with the STI 6-Speed?
09:00 - What is involved to run STI Hubs on a WRX? And how are axles related?
12:35 - How can I swap an STI transmission into a narrow-body WRX? ( that is a 2008 - 2010 WRX)
Thanks for watching!
To follow OTC Racing, please check out:
Facebook: @obeythechihuahua
Instagram: @OTCracing
If you are interested, here are links to the parts that we discuss in the video:
iWire Adapter for 6-Speed conversion:
www.flatironstuning.com/iwire...
MAP Wheel Speed Sensor Signal Processors:
www.flatironstuning.com/mapdc...
www.flatironstuning.com/mapdc...
Differential Flanges:
www.flatironstuning.com/sti-r...
www.flatironstuning.com/wrx-r...
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You guys rock, such great distillation of a lot of 6 speed info!
Thanks for the comment! Coming from you all, that is high praise indeed :-)
You guys simply rock. Dispelling all the swap myths in one place....so great!!!
Thanks Javier, and thanks for watching!
Great video!!!!! This is thousands upon thousands and years upon years of threads on the internet into one video. You guys are great!
Thanks Toua, and thanks for watching!
Always a plethora of information! Thank you for taking the time to make these videos!!
Thanks Derrick, and thanks for watching!
All the little bits of information are really helpful. I’m in the process of putting an 04STI trans in my auto 05 wrx.
Thanks Andres, and thanks for watching! Converting from an Auto is a lot more work. Good luck with the swap!
I love all the information available in your videos. I’m doing a mild build on the EJ257 and looking for as much information as I can for the trans swap. Keep up the great videos!
Thanks Andres. Will do!
Great video! Time to start saving and buying parts and watching and rewatching and watching this video again.
Glad we could help, and thanks for watching. Stay Tuned!
This guy is a wizard
Thanks for the comment, and thanks for watching!
Thank you..this video made me realize the 08-10 narrow body rear hub is really different..was all looking the same. I shoulda know it was going to easy ;) Thanks again for the info!
Thanks for the comment, and thanks for watching!
Great video as always, one note the gravel rotors came OEM on STI V6 RA(and 22B) it had 2 pots and an R180 Rear end, and can be purchased from Japan
Thanks for watching and thanks for the note!
Yep...your videos are awesome. Always super helpful.
Thanks for that, and thanks for watching!
Love the video and appreciate the insight. I do have a question though. I know the 11+ have adjustable differentials settings and the likes with their electrical systems. How do those translate or are they completely disabled in the swap?
I have an 11 Sti 6mt in my 95, perfect fit with the og fwd braces removed from the tunnel.
Thanks for the comment and Stay Tuned!
Great videos. We have a 2013 wrx. We were going to buy a 08-14 jdm 6 speed but ended up buying a wrecked 13 sti for the transmission/suspension. What are the differences between jdm and US trans? Thanks
Great video and answer a lot of the common questions or even the hiden. But, just to confirm a quick question... Does 2018 STI 6 speed fit on GD serie? Thank you very much
For those that are looking for simpler. Look into the TY856B1CA trans from the Version 7 STi RA. It’s the only 6 speed Subaru made that was non DCCD but has the front and matching rear lsd.
Thanks for the comment Brandon! Yes, the very early 6-Speeds do remove the complexity of the DCCD. However, with a good controller like the MAP DCCD, the functionality that you get from the DCCD is pretty impressive. I my opinion, if you are going to go to the trouble of putting in the 6MT, you really want the functionality that the DCCD brings. Thanks for watching!
FlatironsTuning not knocking the DCCD at all. I just finished my swap a few weeks ago and it was just another cost and headache of wiring to deal with so I tried to avoid it. My suggestion was just something in the middle because the Spec B is open diff and usdm STis are dccd.
You can also have the 2012 and later 6 speed trans machined to accept the speed transducer. It's a relative cheap and straight forward job, you just remove the front diff housing and take it to your machinist.
Excellent video! Can you possibly do a vid for the 08-09 LGT for swapping the STI 6-speed with DCCD?
Thanks for the question Brian. Basically, it is the same as the 08-14 WRX video that we did: kzhead.info/sun/ds2ed72thnyHnWw/bejne.html Since there is a Spec-B to refer too as well, that is a fairly straight forward swap. I hope that helps, and Stay Tuned!
ive also noticed that the r180 rear diffs before the my06 sti that run the suretrak diffs have the smaller flange and the ones with the plated diffs run the larger flange. my06 and my07 stis had the larger flange.
Thanks for that Kaeros! We actually ran into exactly this with the parts that Tasso was using. Though his was a 2003 JDM drivetrain. My guess initially is that this was more on the JDM cars than the USDM cars, as this is the first time that we had seen that issue come up, so we'll have to do a little more investigating. Thanks for watching!
So much good info! Still confused on what my options are for an 02 legacy be/bh n/a chassis thinking a pre 06 6 speed
Thanks for the question. The year of the STI transmission really wouldn't matter, it just has to work with the rear differential you are using. Hope that helps and Stay Tuned!
@@FlatironsTuning So if I grabbed an r160 diff I could keep my 5x100 hubs if I just chose the proper front axles whether theyre female or male stubs then grab an auto driveshaft and bolt it all in?
This is very informative. Thanks for taking the time to make these videos. I have a question though. I'm currently considering putting an sti 6 speed into my 2011 gve/g3 wide body wrx as my 5 speed has blown synchro's and might not be worth rebuilding. I've been trying to find out exactly which sti boxes will bolt straight up but I keep coming up short. I've been told that a sti box from the same year will work, but I will need a sti shifter linkage, shifter surround and a tail shaft. If you can offer some advice or guide me to the right place to look it would be greatly appreciated. I've spent many hours on forums trying to find answers to suit my model wrx but can't seem to find concrete information. Your videos seem to be the most accurate information I've found, Thanks again and great work. Looking forward to your next videos!
MY04-MY05 STi transmission would allow you to keep your rear diff (r160) as they are both 3.9:1 gear ratios. Otherwise, you'll have to swap the rear diff (r160 to r180) and the transmission together (from the same year/code STi). You will still need the shifter linkage and all the other wiring he mentions in the video. Clutch and flywheel from the STi also, along with the clutch fork and slave cylinder from the STi (push vs. pull). The slave cylinders might be the same, I'm not sure, but I would think you might need the longer pressure line from the clutch master cylinder to the slave cylinder in any case.
Thanks for your question Dose. The reply below pretty much covers your question. Thanks for that Sam! I will add that you want to keep in mind that you have an open rear diff. If you do keep your R160, that can cause some odd behavior from the drivetrain, as it is far less than ideal considering you are getting a DCCD center diff and TBD front diff with the 6-Speed. This is especially true without a controller, but either way, that open diff in the back is an issue that you will want to address at some point. For that reason, it may be better long term not to be too attached to that, and look at other options. A 2002 - 2005 diff will have a viscus diff, but at this point, most of them will have lots of miles on them, and that viscus coupling is most likely not in great condition. This is why in our car, we just went to the STI R180 because it has a TBD to match the front in the STI transmissions, and since you have a wide-body WRX, all you need are STI axles. Lastly, you will need a slave cylinder with the STI transmission. The slave cylinder is not interchangeable between pull and push style transmissions, but your master cylinder will work just fine. Hope that helps, and good luck with your swap!
@@FlatironsTuning if the spline count on the R180 are the same as the R160, can you just use the WRX axles until you can afford also getting STi axles?
@@nekidfrog The spline count on the differential is not the same. That is why you have to use a different axle if you are going to run the R180 differential. Hope that helps and Stay Tuned!
Another Great video! Heres a question, looking at the subaru transmission charts you will notice that the suretrac r180 was never paired with a dccd., do you know why that could be? Would it be dangerous, bad to pair a rear suretrac with a dccd and lsd front?
Thanks for your question Josh. That is an interesting one. I would say that you would not want to pair a torque biasing differential (which the Suretrac would fall under) with a front LSD (clutch type diff) in most cases in general. But the work fine if both front and rear are TBD's. I don't that a DCCD would have any negatives with a Suretrac rear, but I've never heard any reason why Subaru largely went away from them. It could be as simple as cost really... I hope that helps, and thanks for watching!
oem subaru also have the rear rotor to run the subaru 2 pots with the r180 rear hubs. The gc8 type ra came standard with 2 pots and a r180 rear end running the larger handbrake.
Thanks Kaeros. That makes perfect sense as the GC STI's had the R180 diff, but still were still running the Subaru 2-Pots. We may have to see if that opens up any more good options for those rotors. Thanks for watching!
Watched one video 1 min in subed thanks guys
Awesome! Thanks for the sub, and thanks for watching Ryan!
Love your videos, it's helping my with my GR 6mt swap right now. I have 1 question, if I'm understanding correctly, I can use a 02-05 r160 with my 2014 sti trans?
Thanks for your question Jonathan. Yes, that is correct. The 02 - 05 R160 has the correct R&P ratio for the late 2006+ STI transmissions. It will bolt up to your car, but they did change the forward differential mounts on the GR, so you will need that forward diff support to run the older R160. Good luck with your swap, and thanks for watching!
Thanks! I made note of that. I ended up finding my R180 this weekend that I had been hunting for.
This video has me very excited! I was debating on selling my 13 hatch wrx and looking for a a Sti hatch but if the parts are interchangeable this looks better to do. My question is can 6 speed be done to the stock ej 255 engine the wrx comes with? Thanks!
Thanks for your question. Yes, absolutely! The EJ series bellhousings are the same so you can bolt up the STI 6-speed no problem. Thanks for watching and Stay Tuned!
great video. I have 2006 sti. engine swapped to 2003 ej205 and standalone ecu. currntly my DCCD is not working with ej205. while its working with the ej257. how I can keep the dccd working with the ej205? also what is the other things that I need to look into for this kind of engine swap? Thanks in advance
Thanks for your question. All you need to get the DCCD working is a separate controller. We like the MAP-DCCD controller, and we keep them in stock :-). Here is a link to our video explaining how that works: kzhead.info/sun/aKiMc7uhnneYgps/bejne.html Hope that helps, and let us know if you have any other questions. Thanks for watching!
Will an 07 sti transmission and gear be a direct swap for a 04 sti transmission and gear?
Hah, a year later I just realized this video came out very close to the date my 3rd gear (5spd) shredded.
Great info so I can keep my hubs on a 09 wrx narrow hatch and use sti axels in the rear correct?
Thanks for your question. As we discuss here, the answer to that is no. The STI axles are too long. For the narrow-body cars, if you aren't using the STI knuckles in the rear, you need to run the Driveshaft Shop Rear axles. Those are the only ones that we have found to work on the narrow-body cars if you are running the R180. Here is a link to them on our site: www.flatironstuning.com/driveshaft-shop-direct-fit-axles-800hp-08-14-wrx-w-r180-differential-conversion Hope that helps, and Stay Tuned!
Question: The ending of this video addresses the narrow body GR vs. the widebody GR suspension differences. Does this also apply to the GD chassis between the Wagon and the Sedan? I believe the wagon will need rear lateral links and front control arms to complete the 'wide-track'. Correct?
Thanks for your question. Yes, in the case of the GD Sedan Vs. Wagon it is the front control arms, and rear lateral links that are different between the two. There is less of a width difference between the GD's than the GR's, but yes, to do it properly you would need Sedan lower control arms and Lateral Links if you were going to run STI axles.
Much appreciated :)
I just got a Subaru impreza coupe 1996 so would a sti engine 2004 or 2006 fit fine in my coupe
First thanks for all these informative videos. I will be doing bolt on upgrades to the bugeye when i get back from deployment: Tomei headers and catback, sti control arms, adjustable sway links cause i put king lift springs for a gravel setup. And I will gladly purchase from Flatirons Tuning (I already have the items bookmarked). looking at doing a 6 speed swap. While looking at the JDM 6 speed options I saw some have female splines and others with the male. My question is: are these output splines interchangeable? I found a good deal on a 6 speed kit with rear diff and drive shaft for under 3k. to keep the wrx axles and knuckles id need the male spline from trans. can I change the 6 speed output spline from female to male? thank you
Thanks for your question. If you have not found our GD video yet, I'd recommend starting there: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html We go into those exact details in that video. I hope that helps, and Stay Tuned!
Great video, Very good info. My question is about running sti axles. Can i still use the wrx axles? will they fit the 6speed? If use sti front axles is is possible to just press 04 sti bearing and hub into the WRX knuckle? and I assume i can just leave the rear axles the same if im running the R160, correct? Once again thanks for the video! keep up the good work!
Thanks for your question . Yes, you can use your WRX axles up front. If you want to run 04 STI axles, try to fit them in the WRX hubs. One of our customers tried this and said it worked, but it is the only instance we have seen that. If this does work, it is most likely because the 04 STI also uses the 5x100 hubs. From our experience, all of the 5x114.3 hubs have different splines compared to the 5x100 hubs. The STI bearings are physically larger than the WRX ones, which is why you can't just press in the STI bearing and hub into a WRX knuckle. And yes, in the rear, if you are using the R160, you can keep your WRX axles as well. Hope that helps, and thanks for watching!
FlatironsTuning wow thanks for your response, i was a littke worries id not get an answer because it an older video. Thanks for the info. Much appreciated.
Thank you so much for your channel. It's been invaluable to me. Question: I want to put an STi transmission into an '05 OBXT. How is that process going to look different than what you've described here? Information on BL/BPs is hard to come by, and so I usually go with whatever the wisdom is for the GRs.
Thanks for your question. Basically it would be pretty much the same as the process of installing a 6-speed into a 2011 - 2014 WRX. The main difference you have is the body lift in the OXT. For an Automatic driveshaft, it would have to be from an OXT only to have the correct spacer. For axles, you can use the Spec-B rear axles if you go with an R180 as well. I hope that helps and Stay Tuned!
@@FlatironsTuning Thank you so much. I don't quite follow you on the issue of the drive shaft, and do you have a video on rear differentials?
@@FlatironsTuning i have a 2005 outback wagon N/A with 5 speed but I need a little more to keep up on the freeway.If I get a wrx 5 speed trans can it work with the outback diff and can the axles work?
awesome stuff how hard would it be to put a 2011 sti transmission in a 2005 sti thers not really any forums on this but im just curios what your thoughts are on older sti to newer sti part swaps?
Thanks for your question. If you go back through this video, there are issues with the speed sensor and rear R&P ratio that you would have to address. Beyond that, there is a different center differential in those two years, so the stock DCCD controller may not work properly with the newer transmission. Hope that helps and Stay Tuned!
I just recently got the 04 sti 6speed conversion can’t figure out what front diff I have replacing axles now hoping not diff
Great video! I’m doing a 06 sti trans swap In my 04 wrx, now I’m wondering if I have the right 06 sti trans that’s compatible with the rear diff. Any idea how I can find out if it’s from an early 06?
Thanks for your question. You need to verify the transmission serial number that is on the bell housing. That will tell you what you need to know. Here is the best chart that we have found: www.rallispec.com/downloads/Transmission%20ID%20Chart_Public.pdf Thanks for the question and Stay Tuned!
Whats a ballpark figure at the labor cost to do a 6 speed swap into a 2011 WRX if i were to source the parts?
Imported sti 6 speed will run u at least 3k for a good one and depends on the shop for labor tbh
What do you do with he wires from i wire if you don’t use a DCCD
So can I just plug and play a sti 6 speed with the sti clutch and flywheel on a 2011 limited sedan 5 speed?
Previously wanted to swap 04 sti knuckles into my car but now learning that they still have the press in style wheel bearings is making me second guess. I have heard that they can never hold up to extended track use. Have you found this to be true? Would rather not have to swap my whole suspension to go with the 5x114 knuckles too much invested into it already.
Thanks for the question Frank. The STI bearings are larger than the WRX ones, which is a start, but I'd never say that they can't stand up to track use. As long as you keep an eye on them, and replace the bearings when they start to fail, rather than replace them when they are completely shot, you should be fine. It is more work with the press-in bearings to be sure, but after you do a few, it isn't that bad. Staying on top of them is the key. And yes, if you have wheels and suspension sorted, it doesn't make sense to start over completely for a simpler repair that will come up occasionally.
So up front of car. I have an 09 all I would have to change to is a 2011+ swingarm to run sti driveshaft?
woh, great channel
Having done the 08 sti swap into a narrowbody, the rear sti axle fits no problem.
Thanks for your reply. It will go into both the diff and the rear hub, but we have seen binding issues because of the length of the axle. Thanks for watching and Stay Tuned!
FlatironsTuning hasn’t happened to me yet but thanks for informing me about this! I’ll keep an eye on it.
If in binding you mean blowing out front wheel hubs, this is happening to me.
Hello, what Is the actual weight of a 6 Speed gearbox only? Need the info to organize my self for the swap!
Thanks for your question. It is right about 225 lbs.
I really want to put a 6 spd in my wrx!!
Would this video be helpful for someone trying to put a 6 speed in a 99 SF forester? I eventually intend on putting an EJ202 or EJ207 to accommodate the transmission components
Thanks for your question. Yes, definitely. I would also recommend looking at our GD swap video as that will also give you a good picture of what it will take to swap a 6-speed into your Forester: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html Hope that helps and Stay Tuned!
So if I change the rear to sti nd keep the front the same as a wrx would that work
I am looking to put in an offer on a good deal for an 18’ sti. I want to swap the motor into my 06’ sti. May as well swap everything I can. Is this going to be expensive as far as missing for things to fit? I’m going to have help for the swap, but they haven’t worked on Subaru’s much. Just older cars. I am researching everything I can to make the job easier, if at all possible. What do you recommend? Edit: The 18’ sti is wrecked. Tires, rims, brakes, discs, tranny, engine, all pristine. Except the impact on the passenger side.
Best of luck with the swap, and hopefully our videos are a good help to you! If you need any parts, etc., feel free to reach out. Thanks for watching and Stay Tuned!
Great vid, and I have a question! Found an 04 JDM Forester STi transmission that I want to mate to my USDM GR WRX's R160 with a 1.5 Way LSD I installed in it. Since the Fozzy 6-spd has the 1:1 and 3.90 specs in theory it sounds like it should link to my WRX R160 fine and therefore I can avoid new axles. Any concerns however still running my upgraded WRX R160 with this Fozzy transmission that's non-DCCD but also had a non-Open front diff? The Fozzy STi 6-spd paired with AP SureTrac Front diff, and I know my GR WRX has an open front diff.
Thanks for your question. Yes, as long as your rear differential has the correct ring and pinion ratio for the transmission you are running, it will work just fine. As far as pairing of differentials, there is no issue running a rear clutch type differential, and a front torque biasing differential. That should work well for most applications. Hope that helps and Stay Tuned!
@@FlatironsTuning Appreciate the quick reply! Which DSS would be the proper one to link this Fozzy STi transmission to my WRX r160? www.flatironstuning.com/dss-carbon-fiber-driveshaft-wrx-sti .. actually I think I answered my question already and it's part SUSH12-C. If that's right, then with this shaft I will not need to buy a different rear differential flange?
@@paterick4o8 If you have a 2004 - 2008 Forester XT, you need the SUSH6-C. That is for the 6-Speed conversion with R160 rear diff. Thanks for the question!
@@FlatironsTuning Hmm.. My car is a 2012 WRX, and throwing in a Forester STi trans TY856WL4CC.. it sounds more like it would be the SUSH12-C shaft to fit this to my 2012 WRX R160?
@@paterick4o8 Gotcha, sorry, I got confused with the Forester trans. If you have a 12 WRX, then you need the SUSH12-C as you had previously.
Awesome info. So on my 2010 WRX, if I wanted to keep my r160 I would need a late 06 or newer STI transmission, correct?
Thanks for your question Mitch. I'd recommend you go back through the section of this video that talks about rear differential ratios. You would actually need an 04 - 05 STI transmission only to keep you stock 3.9:1 R160. And keep in mind that your rear differential is open. I hope that helps, and thanks for watching!
@@FlatironsTuning Ah I had it backward. Thanks for your videos, they are very informative. Do you know if all the splines for STI transmission and diffs are the same? So I could use my WRX axles in the front for the 04 STI transmission.. and if I opt for the 04 STI rear diff, I would just use 08-14 STI rear axles, correct? Or do I NEED the 08-14 r180 to make the swap easy?
@@bankruptsee Take a look at the end of this video because we talk specifically about doing the narrow-body WRX swap, and that should answer your axle questions. If you haven't all ready, you should take a look at our GR 6-speed video too, as we go into detail about the axles there as well. But for you, this video will detail the critical info that you need for the narrow-body conversion.
Secret Label I just did my 2011 Wrx 6speed swap with a 04 sti transmission retained my stock axles, 08 AT drive shaft 6speed starter, 04 sti slave cylinder 04 sti transmission mount stock 5spd crossmember
I have a 2007 Subaru Forester XT and would like the benefits of having the STI 5x114 lug pattern what would entail a swap for that?? Is there any benefit from going with an STI suspension instead of the Forester suspension???
Thanks for your question. That is actually a fairly involved swap, which will require switching around brakes, etc. Really, generally speaking, it isn't worth making this conversion unless you know that you need teh 5X114.3 hubs for a specific reason. Hope that helps and Stay Tuned!
Can you do a video on good oil for the FA20DIT lol street and track. I just started using Molygen 5w30 in a bran new car/engine and could smell what I think is oil burning when givin her. Its also the first time im reving past 4000rpm. I don't wanna gunk up my engine and turbo. Not sure if I should go back to factory mobil 1. Thanks
Thanks for your question. Thanks for the suggestion. At some point we may do just that, so Stay Tuned! For now, we do have a blog that is related to your question, so that may be a good place to start. Here is a link to that: www.flatironstuning.com/blog/what-is-low-speed-pre-ignition Thanks for watching and Stay Tuned!
Hi I have a 2006 subaru impreza wrx that I'm looking to do a full transmission swap in it. But im not sure what year I can buy. Thank you
Thank you for your question. You can use any STI transmission, you just have to make sure that it will work with the rear differential you use. Hope that helps and Stay Tuned!
So to take all this in...I have a 05 wrx and if I choose install a sti 06-07 trans plug and play. Get the driveshaft and rear diff to bolt right in. Choice of wrx or sti flywheel clutch kit. I want keep stock brakes and suspension, so I can still run wrx axles ?
Thanks for your question. Definitely take a look at our GD WRX 6-Speed video here: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html We go into all of those questions in these. Thanks for watching and Stay Tuned!
So the WRX axles are compatible physically with an sti drivetrain? You can just slide them into the cups on the differentials? If that is the case one could get aftermarket uprated axles and install calipper adapters on the wrx hubs and you are set if you also get a big brake kit assuming youll be going for more than stock power? I imagine stock axles will be fine for stock ish power and still have live left in them. If that is the case that is genious and Ill be doing that when I do get to that bit on my SF5 turbo since most of the stock bits are virtually GC/GD wrx parts. However Im going to keep the stock axles for a little bit and then get conservatively uprated aftermarket axles because something has got to give and Id rather blow an axle or two than a 6 speed. even if the 6 speed is a SOLID unit Id rather be safe than sorry. transmissions are expensive and a lot more work to repair or replace than some simple axles you just undo a couple bolts and a boot retainers and slide them out given the new axle is a complete unit with a cv joint ready to go. I dunno it just seems like the easiest and simplest way instead of getting an entire STI suspension and fit it on the car and spend heaps of money on all those bits and then make them nice if they arent already in immaculate condition. its good to have options anyways.
Up front, yes, the WRX axles snap into the STI trans. This is not the case if you are using an R180 rear differential. Keeping your WRX axles definitely makes the swap easier, and that is one of the reasons that we made this video. We wanted to let people know that there was an easier way to get the STI transmission installed compared to going with a complete STI driveline. Thanks for watching and Stay Tuned!
Have you guys ever put an STI 6 speed into an automatic 2014 Forester XT? I'm assuming the trans would bolt up no problem as it is an FA20 motor, the same motor I have in my 2016 WRX. It seems like the more STI driveline parts you have (knuckle, axles, hubs, differential, etc.) the easier it would be. Am I accurate in saying that? Thanks for all the info.
Thanks for your question. We don't have any first hand experience there, but from what we know on the 15+ WRX, it is very similar to installing the 6-Speed into the 14 WRX, which is pretty straight forward. Lots of things like the axles and hubs, etc., can be kept. I hope that helps and Stay Tuned!
I have a 13' STI and having 4th gear issues. Car has a hard time going into 4th gear. All other gears are ok. Dealership already "corrected" the issue 20k miles ago, but it's coming back. Car is no longer under warranty. Question.. What would be better option? Pay to have transmission rebuilt or buy a 2017+ STI transmission with low miles for less than $3k?
Thanks for your question. Honestly, the first thing I would recommend is changing the fluid. The Subaru MT fluid is very good at helping with grinding issues: www.flatironstuning.com/subaru-high-performance-gear-oil-75w90 If that makes no difference/improvement, then the issue is most likely mechanical in the transmission. The decision to have your trans re-built versus buying a low mileage used trans is a tough one. You have a known quantity with your trans, but you are somewhat rolling the dice with a used trans. Hopefully it would work out, but you just never know. I hope that helps, and Stay Tuned!
I just installed a JDM '05 STI trans into my 03 WRX. I used your kit to keep my WRX front axles too. I had just changed the WRX's clutch so I wanted to keep it for now. However, Once running the car will not shift into any gear! I swapped the Clutch master and slave cylinders and adjusted according to the factory service manual. I've had also pulled the transmission again and checked for correct installation. Nothing. It won't shift into gear. When the car is started in gear and the clutch is let out, It will whine and grind. Although, I never let the clutch out completely due to the noise. I'm thinking of uninstalling and exchanging at the shop I purchased it from. Any advice would be great! Thanks. Your videos made this possible!
Sorry to hear you are having trouble. So can you shift through the gears when the engine is off, but not when it is running? It somewhat sounds like the clutch is hanging up and not fully disengaging. Hope you are able to find a good solution to get your car on the road. Hope that helps and Stay Tuned!
@@FlatironsTuning It has issue shifting when the engine is off too. I exchanged it and installed the new one. Waiting on a missing transmission mount ATM. Hopefully it's not the clutch!
Update! I got it working with the STI clutch set up without issue. Still not sure what the problem was with the WRX clutch though.
Hi Guys, your videos on the six speed swaps have to be the best on KZhead. From what I understand, if I have a Bugeye GD I should be able to swap in an 07 six speed while keeping my rear diff, axels, hubs breaks and suspension? Are there any other options for me you would suggest?
Glad that the videos were helpful! It sounds like you have watched our GD video as well, but if not, definitely go through that as well. kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html But it sounds like you have everything correct. Hope that helps, and Stay Tuned!
So is the Neutral Safety switch the same on both the 07 STI and 02 WRX? I can't remember whether I used the WRX or STI, but now that I have everything back together, I'm having issues with my idle. I've already replaced the IACV with a new OEM one, adjusted the throttle cable and did a smoke test, but I'm still having issues. I'm suspect it might be the safety neutral switch. Thanks.
Can you fit STI trans into the brz FA20?
Does body style matter? I have a 11' WRX hatchback. I plan on doing an entire STI swap into it. Do I have to use parts from a 11'-14' STI hatch? Or can it be a sedan? Or can I use other years
Thanks for your question. As discussed at the end of this video, the narrow-body WRX's require a few different things compared to the wide-body WRX's. Since you have a 2011 which is a wide-body, I'd recommend going through our video on the GR specifically as that will be the information that applies to your car: kzhead.info/sun/ds2ed72thnyHnWw/bejne.htmlsi=9DN_nbdoGQBynT4_ Hope that helps and Stay Tuned!
Hi. Did you have done any 4eat to 114.3 conversion? I have a 06 Forester 2.5XT and want to convert it to 114.3 and keep the 4eat. I do have a set of Front & Rear hubs and bearings from 06-07 GDB-F STi. It's not a problem to get a set of new shock absorber for 06-07 GDB-F STi. I thought the Front 114.3 hub would compatible with my 4eat front axel. But the rear end is a pain in the ass. As I know, there is no R160 to 114.3 hub rear axel exist? (Some said Tribeca rear axel will work, but I could not found any definite answer.) The ratio of my 4eat is 4.11, I believed. And there is no R180 with 4.11 ratio exist that I can just swap the whole rear end? I would be grateful if you have any good idea/experience for this. Thank you.
I have a 2007 WRX wagon, and want to swap a full STI drivetrain, 6 spd, axles, driveshaft, hubs, r180, and suspension. Is that possible? Are there any differences between the sedan and wagon body/frame that would cause a conflict?
Thanks for watching. The only difference is that the GD wagon is 10mm shorter track on each side. So you would have to run the STI lower control arms and lateral links to be able to use the STI axles, etc. The simplest path would be to stick with the WRX axles up front and the Driveshaft Shop conversion axles in the rear so that you can keep your hubs and suspension components. I hope that helps, and Stay Tuned!
So just to verify, because I’m a little slow, with a 11wrx I can bolt rear STI axles no problem, along with the R180 diff. And the proper diff mount for it. Also, I would need a STI tranny mount( even if I have a group N aftermarket?) wrx axles in the front, and I get to keep the suspension the way it is, I know I’m pretty much repeating everything but I want to make sure I fully grasped everything. Just to confirm again I do have a 11 wrx
Hello Marco. Yes on all counts. Sounds like you have it all straight. Thanks for watching!
Thanks so much, keep being awesome and posting awesome videos!!! So helpful!!
If I wanted to use a JDM Ver7 transmission on a USDM 2003 WRX what exactly would I need to change? I’m thinking of buying a JDM Ver7 trans and most come with a rear diff and JDM wiring.
Thanks for your question. I'd recommend going through our GD specific video. That one, with the FAQ video here has all of the information you should need. kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html Stay Tuned!
What difference would there be if I were to use a JDM transmission instead of a USDM when swapping to a 6mt?
Physically there is no difference. Some of the JDM transmissions have different ratios (mainly 5th and 6th), and as always, you will have to make sure that the transmission you are getting will work with the rear differential you are using. Hope that helps, and thanks for watching!
My clutch master cylinder started to fail on my 2004 Subaru TS. I went to a parts shop to get both the master and slave cylinder. When I got home I noticed the parts didn't fit my car. When I went back with the old parts off my car the guy told me the parts where for a WRX STI. I bought the car at auction and no nothing about it's history. It runs great, I've been driving it since last year. I've never tried shifting the car into six gear ever. Maybe at one point they used the same master and slave setup but why? Anyone have any clues?
Thanks for your question Lewis. For the Master cylinder, there hasn't been much change in those. For the slave, of course the clutch type makes a big difference. If you have a 2004, you should have a pull-style clutch. Most of the pull style clutches have similar slave cylinders, but there have been some changes over the years. Good luck getting your clutch working again, and thanks for watching!
I would like to mount 2001 sti 6 Speed on a 2007 wrx. Does the engine starter motor has to be changed?
Thanks for your question. You will definitely want to go through the transmission and rear differential ratios that we talk about at the end of this video. There aren't any STI's that have the same ratio as your 2007 WRX, so you will have to do something with your rear diff. Thanks for watching and Stay Tuned!
I have an 09 wrx would I have to change anything on the front to change the rear diff, and axles to an sti
Thanks for your question. As long as the R180 works with your WRX transmission, you wouldn't have to change anything with the transmission or front axles. Thanks for watching and Stay Tuned!
@@FlatironsTuning alright so in order for me to change the rear diff an axles I do need rear sti knuckles?
I got a 98 Impreza rs. does this swap work with that car also? what is the cost on doing all of this?
Thanks for your question. Yes, the process is basically the same for the GC chassis as the GD chassis. As to cost, there are a lot of variables in play there in terms of components. To start with, you can look at our 02-03 WRX kit (which would be most applicable to the RS chassis), and build the kit out from there. All of the parts that we work with are brand new, so they are more expensive than used, but you also know that they will not have any wear issues, etc. www.flatironstuning.com/flatirons-6-speed-transmission-swap-package-02-03-wrx Hope that helps and Stay Tuned!
Hey man I’m doing a 04 sti swap in a 04 wrx and I was wondering we’re is the reverse light switch
Thanks for your question. The neutral and reverse switches are the two things that are plugged into the side of the transmission, and then the DCCD is driven by the wires that go to the back of the transmission. Hope that helps and Stay Tuned!
Hello, Jon. What about gearbox crossmember? GD wrx vs sti. Thanks!
Thanks for your question. We cover that swap in specific detail here: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html&feature=shares The short answer is that the transmission crossmembers ar the same. Thanks for watching and Stay Tuned!
No, thank YOU for the priceless confirmation!
Do you have any recommendation regarding the decision between the early DCCD with 35:65 torque split and the newer version with 41:59 torque split? As far as I know, the newer versions (2007+) have an additional mechanical LSD, but I'm not sure if this affects the vehicles handling in a positive or negative way. Subaru claims, that this mechanical unit makes the car more predictable to drive, but I always thought the big advantage of the DCCD would be that there's minimal load on the front tires when the controller completely unlocks the diff, resulting in optimal corner turn-in. Doesn't the mechanical LSD (even if it seems to have very low ramp angles) counteract this advantage? And what about the 6% difference in torque split, is this very noticible? I heard someone say that the 35/56 version is close to undriveable in open mode, but can it be worse than a rwd car? Sorry for this complex question, but i'm looking to do the swap in my legacy and i'm not sure which gearbox I should look for.
Thanks for your question. This is a question with a couple of levels of answer, so for now, I'll have to give you the high points, and you can contact us directly if you want to go into more detail. First, I'd base your choice for transmission around what is available, condition, mileage, etc., first, before I'd focus on the center diff function alone. All of the STI DCCD's work well, and though there are differences, they are not what I would focus on. The early STI transmissions (03-05) use a center diff that is open when no power is going to the DCCD just as you describe. If you want maximum rear bias, this may be a nice feature, but the newer transmissions behave almost the same. The bigger benefit to these early transmission is that they have an internal pump for better oiling of the transmission as a whole, and I'd say that this would be a more significant factor to push the decision to an early transmission. But of course, it would have to be in good shape as well. The later STI transmissions (2006+) started to incorporate a viscus coupling that works with the DCCD. So though you may not be able to get the same rear bias as you can with the early transmission, it is pretty close. Both new and older transmissions will feel mostly like rear-wheel drive cars with no power going to the center differential. But these later transmissions did away with the oil pump for lubrication (starting in 2007+) and went to a more standard sling-trough. This makes the transmissions simpler in some ways, but maybe not as ideal for very high power or Motorsports use as the earlier transmissions with the dedicated pump. So they both have some pluses and minuses. But any STI transmission will be very durable, and should work much better than any 5-speed would. Hope that helps, and thanks for watching!
Thanks for your advice. Since the car will remain mainly a daily driver and I do not intend to exceed the stock 280hp very much, the presence/absence of the extra oil pump may not be very important. I will follow your advice and focus on availability and condition.
I really need your help I have a 2007 wrx and I want to do an sti swap. and I also will switch the clutch kit and the suspension to sti is there anything more I have to do and also. I have found some sti transmissions but I can't find the number anywhere when I look it up the article numbers on the 2 I have found is these 2: TY856UG1MA TY856UG9AA so I'm not sure is these will fit at all
o just recently had a 2016 Wrx with a STi transmission swap also opted with the DCCD pro controller kit with the adjustable knob on the interior I noticed when I got the car back the gear position indicator on the gauge cluster showed 1st 2nd 3rd 4th and 6th gear but when I put it in 5th gear it still shows to be in 4th gear just trying to find out if anybody else had this issue the shop is sort of giving me the run around saying that it's " apologize about that as far as the gear selector is goes off speed and rpm not an actual gear select sensor."
My 06 sti was built in 10/05. Would that be considered late?
You would have to check the serial number on the transmission but most likely it is a 2005 spec transmission since it was built in 2005. Hope that helps and Stay Tuned!
So for my bugeye I can run any ear 6speed sti transmission? If I get a driveshaft, and ddcd controller and iwire cables ?
Thanks for your question. The basic answer is yes, but you have to make sure that the transmission will work with whichever rear differential you decide to go with, and depending on the year, the STI trans may not have a speed sensor, so you would need to deal with that as well. I hope that helps and Stay Tuned!
Hey, do you guys know if SG9 STi forester 6 speed complete drivetrain bolts into GD WRX chassis? rear hubs, front hubs, axles, etc.
I’m looking at doing this in a 2011 wrx hatchback. What version transmission should I be looking got V10?
Thanks for your question. Really the model year of the transmission isn't the most important thing. I'd say that you want to find the 6-speed with the least miles that is in the best condition. From there, make sure that you are pairing it with a rear differential that will work with the transmission, and you should be fine. Hope that helps, and Stay Tuned!
FlatironsTuning 1. Any 6 speed transmission? 2. DSS speed conversion drive shaft Is this the driveshaft you guys use? www.importimageracing.com/collections/driveshaft-shop/products/driveshaft-shop-6-speed-conversion-1-piece-carbon-fiber-driveshaft-subaru-wrx-2008-2014 3. R80 differential? Or does this work for R60 4. Will I need the converter box you show in this video?
Have you guys made a video on 6 speed swap for GCs?
Thanks for your question. Basically, it is the same process as putting a 6-speed into the GD. Here is a link to that video: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html Hope that helps and Stay Tuned!
Hello again and again thank you for all your videos! Here's my question: do R160 axles fit intot he R180 rear differential? - or, if I change the rear diff from R160n to R180, then the axles need to be changed and then the everything else (rims, brakes, etc.)?
Thanks for your question Mihael. First, I would recommend that you also watch the video that we did about the GD STI Transmission swap, as that is covered more in depth there: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html But the short answer is no. The splines are different between the R160 differential and the R180 differential. If you want to run an R180, and keep your WRX hubs, the simplest path is to use a conversion axle like the ones that Driveshaft Shop make. Here is a link to them on our site for reference: www.flatironstuning.com/p-2691-the-driveshaft-shop-subaru-1992-2001-impreza-wrx-sti-gc8-2002-2007-wrx-gd-with-r180-differential-conversion-800hp-rear-axles-new-price.aspx I hope that helps, and thanks for watching!
Thank you very, very much for your answer!
Hello and again thank you for all your availability and knowledge to answer these questions! What is the situation in the front? Can a 6MT diff work with the 5MT axles? Do the splines match?
Yep, the front axles will work in both the 5MT and 6MT.
Oh, that is very, very interesting! So do you think that a 6MT front differential would fit into a 5MT gearbox? - it is hard for me to find a Torque Biasing Differential for 5MT but there are plenty for 6MT...
What's up guys, I am new to subaru. I have a 2005 outback wagon N/A, 5 speed. I need a little more, can I get a wrx 5 speed, will the outback axles work or do I have to get a diff too?
Thanks for your question. You wouldn't want to do that the WRX gearing is much taller because the turbo engines make more torque than the NA cars. If you put that trans in your NA outback, the car would feel a lot slower most likely. Hope that helps and Stay Tuned!
how much would you think to swap in a 6 speed sti trans in an auto wrx
Thanks for your question. You would be better off buying a manual WRX or an STI for that matter. Having to swap out for a manual pedal box is a ton of work, and in most cases, it just isn't worth it. Hope that helps, and thanks for watching!
What about 6speed swaps in 90s Impreza’s? I’m planning on doing this on my 98 Subaru Impreza outback.
Thanks for your question. For a GC, the steps are basically the same as what we laid out in our GD section. You just have to make sure that the rear differential you use works with your transmission. kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html I hope that helps and Stay Tuned!
@@FlatironsTuning omg thank you!!!!
would i need axles/hubs/brakes/ if i did 2004 sti transmission swap into my 2006 wrx?
Thanks for your question. Take a look at the video that we did that goes into specific detail about the GD swap. If you have any questions after watching that video, reach out to us through our Live Chat on the site, and we'll do our best to help! kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html Hope that helps and Stay Tuned!
Still kinda confused ? Can you use the wrx axle on the narrowbody and with what diff?
Thanks for your question Nick. I'd recommend going through the video again as those are topics specifically covered here. If you want to go over your build plan, set up a consult with us here: www.flatironstuning.com/6-speed-consultation And we'll do our best to help you out. Hope that helps and Stay Tuned!
@@FlatironsTuning thank you , will do and have a great day
My input shaft bearing is going out on my 2008 Impreza 2.5. and if I need a new transmission how difficult is it to swap the stock 5-speed with a 6-speed of that year?
Thanks for your question. I'd recommend starting out with our video about that swap here: kzhead.info/sun/ds2ed72thnyHnWw/bejne.html Hope that helps, and Stay Tuned!
Could a 6 speed be mated to a high and low reducer on impreza 1.5r 2010??
Thanks for your question. From what I have seen from the Subaru's with Hi/Lo transfer cases, that is inside the transmission, so you would lose that with the 6-Speed. Hope that helps, and thanks for watching!
@@FlatironsTuning that helps thanks
Can I utilize 07 wrx rear diff if I use 07sti transmission?
Thanks for your question. No, those are different ratios. I'd recommend going back to this video at 6:20 where we go into detail about the rear differential ratios as that should give you the information you need about this. Thanks for watching and Stay Tuned!
i have a 2001 wrx bugeye want to buy s202 donor for 6 speed swap, can it be done only the gearbox and the prop shaft? because i see the s202 has 5x114 hub and i don't want to replace my new coilover on a 5x100 hub. any suggestion? tq
Thanks for your question Lev. We talk about that a bit at the end of this video, but we have a detailed video on putting a 6-speed in a GD that goes into more detail about your specific question. here is a link to that: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html Hope that helps and thanks for watching!
Doing one of these swaps now on an 03 wrx. Will the iwire harness work if he doesn't have a diff controller as of yet?
Thanks for your question. Yes, the iWire harness would still work. The lines from the DCCD would just not be connected, then when you are ready to get that working, the framework is there to connect to the DCCD controller of your choice. Hope that helps, and Stay Tuned!
@@FlatironsTuning thank you so much!
What year, 6 speed sti transmission would fit into my 2007 Subaru Forester XT?
Thanks for your question. In terms of the STI transmissions, they are all the same fitment, so the year doesn't matter from that stand point. Hope that helps and Stay Tuned!
Thanks for the respond. Will I be able to use my rear diff with the sti transmission also? Or what would you recommend?
What's different if you're swapping an 02 wrx wagon?
Thanks for your question Cameron. I'll first say that you should look at the video that we did on the GD swap specifically. Here is a link to that: kzhead.info/sun/obmDZ6lqeZprmmg/bejne.html For the Wagon, the only difference is the track width. If you decide to run STI axles, you will need to widen your suspension to the Sedan width. Otherwise, if you are keeping your axles, and running your R160 diff, then they will work just as we describe in the video. I hope that helps, and thanks for watching!
So if i have an 2008 wrx hatch what sti gearbox must i get?
Thanks for your question. There is no specific year that you would have to get. If you wanted to keep your rear diff (which wouldn't be ideal because it is an open diff), you would need an early STI trans (04-05). If you are going to be swapping out the rear diff for an R180, then it would only need make sure that the ratios of the diff and transmission match. If you haven't all ready, take a look at the other video that we made specifically about the GR swap as well. Here is a link to that: kzhead.info/sun/ds2ed72thnyHnWw/bejne.html Thanks for watching!
Have you guys done a sti DCCD trans swap into a VA WRX?
Thanks for your question Chris. Not yet. We have started to look into it a bit, and from what we can tell, it is very similar to the GR WRX. With the different final drive, you will need to replace the rear diff with one that matches the 6MT, but that seems to be the biggest hurdle. Hope that helps, and thanks for watching!
Now if I were to swap in a 6 speed into my 11 wrx, and buy the I wire harness. Could I just connect the sti dccd like factory? Or do I need an aftermarket dccd controller
Thanks for your question. You would still have to run an aftermarket controller. The STI DCCD controller is on the STI CAN bus, so you would not only need the STI ECU, but everything on the CAN Bus that the DCCD controller needs to see to get it to work properly. The aftermarket controller is the simpler solution by a mile. Hope that helps and Stay Tuned!
Hi mate, I’ve put in a 6 speed DCCD into my gc8 v6 type ra (5 speed DCCD) but didn’t change the wiring harness to a 6 speed now my Speedo isn’t working, would you think the 6 speed wiring harness would fix this?
Thanks for your question. The speed sensor between the 5-speed and 6-speed transmission is the same. It also has its own harness and plug. I'd say it sounds like an electrical problem, or maybe the sensor got damaged in the transfer. Make sure that everything is plugged in, and that the sensor is in good shape. Hope that helps and Stay Tuned!
I have a 2011 wrx hatchback... swapping In a 2008-14 sti fb-ty856ub1ka from Japan with the short gear ratio 50/50 tourque split with no dccd... but I'm having trouble with the wiring harness 6pin connector on the trans to the 4 pin on the car... should/can I still use the "Iwire adapter" to fix this? Even tho I dont have a dccd controller... also there is another 4 pin connector near the tail of the trams but I have nothing for it to plug into I'm not sure where it goes to or what it's for? Should I just cap it off... please help I'm awful with electrical
Thanks for your question. If you aren't comfortable with the wiring part, then yes, the iWire harness would be the best way to go as it makes the wiring plug and play. www.flatironstuning.com/iwire-turbo-to-dccd-transmission-adapter Hope that helps and Stay Tuned!