Unleash the Beast: 4EAT Performance Transmission Rebuild
2004 Subaru Forester 4EAT Performance Transmission Build
This video demonstrates a performance transmission rebuild of a 4EAT, found in the 1997 to 2012 Forester, WRX, Impreza, Legacy and other Subaru vehicles.
This particular video is of a 2004 Subaru Forester automatic that was sent to us for our 4EAT transmission upgrade.
Teardown of this transmission: • 4EAT Teardown- Nasty M...
4EAT Valve Body Rebuild: • Secrets Revealed- 4EAT...
The transmission fluid is pretty gross- 20 years without a flush or service!
The 4EAT was at our shop for a complete performance transmission build, including our extra clutch set up, our upgraded performance modified valve body and of course, it's going to also get a high stall torque converter.
The high stall torque converter makes a night and day difference in the performance and acceleration of these vehicles, it almost makes it feel as if you put a second engine under the hood and causes no undesirable effects as far as streetability is concerned.
IPT Performance Transmissions specializes in Subaru high performance automatics and Subaru built autos, as well as performance rebuild kits, modified valve body and high stall torque converters. IPT is recognized as the leader in 4EAT transmission technology and has been upgrading the performance of the 4EAT since opening in 2001.
If you own or work on an automatic transmission equipped Subaru or have one that's got transmission problems, be sure to watch this video to learn about the 4EAT auto gearbox and how to avoid some of the common problems. If you're experiencing any transmission problems or need an upgrade to handle additional torque and horsepower, be sure to contact our experts at IPT Performance Transmissions for a free consultation!
More details on our products can be found here:
www.importperformancetrans.com/
Subaru High Performance Automatic Transmission Parts:
www.importperformancetrans.co...
Tool: Subaru Pinion Nut Tool 499987003
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This transmission incorporates a lock-up torque converter, engaging in all forward gears except 1st, and it's available in both FWD and Full Time AWD setups.
Since its inception, the 4EAT transmission has undergone continuous development and refinement, with various Subaru models witnessing changes, including a significant redesign in 1997.
This redesign eliminated the 2-4 band, revamped internal components, and introduced a new electronic control system. The second design is easily recognisable by the lack of a band adjusting screw and the addition of a spin on oil filter, which was eliminted in 2008.
For a comprehensive understanding of specific 4EAT operational traits and features, consult the relevant Subaru service manual for the specific year and model you are working on.
Some 4EAT's are also equipped with the VTD (Variable Torque Distribution) AWD system. This AWD system adjusts power to wheels depending on driving conditions. Typical biasing is 45% to the front wheels and 55% to the rear wheels.
Gear ratios are as follows:
Automatic transmission gear ratios:
1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.694
reverse - 2.272
final drive ratios (application dependent) - 3.73, 4.11. 4.33
IPT Performance Transmissions specializes in Subaru high performance automatics and Subaru built autos, as well a performance rebuild kits, modified valve body and high stall torque converters. www.importperformancetrans.com/ Find us on Social Media Instagram - @IPTperformancetransmission Facebook - Import Performance Transmissions Tik Tok - IPT_Transmission
I'm looking into getting either a 2008 or 2011 Forrester XT both have the 4EAT and are making over 400awhp the 2008 is making 522awhp and 501awtq with higher stall tq convertor and external trans cooler, is there any advantage the 5EAT has over the 4EAT? If not what's the recommended HP/TQ limit on the 4EAT with your rebuild upgrades?
every day is arm day when u wrestle transmissions for a living!
Джон,хороший обзор акпп спасибо за ролик!
100% TOP SHOW and quality video = well done Sir .
this trans is incredible. similar to toyota a140e before AWD mods
Those output shafts make excellent screwdriver handles, great tool steel.
Outstanding! Thank you!
Great Video, I toasted one of these last year, and before I knew about this channel, I decided to swap out the ej and 4eat for an ez and 5eat, as I want super low ratio 1st for crawling over rocks and up steep hills. Is it possible to alter the final drive in the 5eat reliably? and Have you ever come across an e locker or air locker in a 4eat or 5eat? Thanks in advance.
Amazing, you make this look so easy, d you have any rebuilt transmission for a 2009 Subaru Forester 2.5 XT Limited Turbo?
excelente muy profesional. saludos
Thank you ⚙️
It's absolutely awesome the way you narrate these videos and describe everything, especially the "bowl" and "cone" descriptions of certain pressure plates. Your videos gave me confidence to tear down my 5EAT and made everything recognisable and easily understandable in coordination with the Subaru Service Manual. Is that lubricant mixture consisting of ATF and Assemblee Goo ? I noticed that you only used the Goo in the 5EAT video, and the SSM says to use ATF so I assume this is the ideal combination you're using ? It looks perfect. Thanks for these videos !!
Thank you. The mix is 1:1 atf and STP oil treatment
@@iptperformancetrans Great, thanks! I'll try that.
I was wondering if you were going to pressure check it The Pistons are Working! Nice Job thx
I don’t show everything in every video but there are several air check procedures in some of the other videos
Could you use the 4eat trans in a 2015 Wrx???
Is the modified pack with added friction just for high output turbo applications, or does it benefit the n/a daily driver as well?
It would help anything but is more necessary for higher power applications
Could you write all the clearances and tolerances in the packages between the clutches and the steel. Not just low reverse. You take a measurement but don’t wrote it. Thank you
Hello sir , quick question the exterior plug fpr the valve body that is mounted on in the case of the trans ,is that replaceable? Mine is cracked and leaking fluid .
They are, they connect from the bottom to close to the firewall on top of the transmission bell housing. It’s the ‘external transmission wiring harness’ and they differ from year to year
@iptperformancetrans how do I pop it out of trans housing ? From I side ?and also what's it called ?
@@pyzik17 External wiring harness like it said Drop the pan, unplug everything and push it up through the bottom
Odd question, but something I haven't been able to find an answer to: When I shift my car (2003 Outback, 4EAT) into reverse, it makes a relatively loud pop noise. It will also occasionally make a softer pop when slowing down/downshifting. It drives fine other than the noises. I have replaced the driveshaft, as well as the engine and transmission mounts. Cound this noise be a transmission noise?
It could be but I haven’t seen or heard of that particular complaint before
@@iptperformancetrans could the pop when coming into reverse be low reverse and input clutches not comig on at the right time? in your video at around 22:00 minutes, you say that could cause a clunk.
@@jonnysperanzini3897 It’s possible but it would be accompanied by a harsh engagement in all likelihood
@@jonnysperanzini3897 Also, this is a lot of back and forth here, I’d be happy to try and answer your questions if you contacted me at the shop, it would be a lot more efficient Contact should be in the description
is it the same transmission for toyota K3-vet engine?The 4EAT?
Definitely not
What is going bad on that transmission when it revs high but hesitant to switch to the next gear. With loss of power going up hill? All my other parts are new like my Cat and basic tune up stuff.
Are all of your symptoms accompanied by higher rpm’s (slipping) or is it just a lack of power?
@iptperformancetrans so I feel like the engine is running strong. At least it should be bc I replaced everything. Anyway sometimes it goes into like a limp mode going up hill. It could be the engine is week but the fact it revs up to 4-6 k and just stays there not wanting to shift. Sometimes it shifts. Then also it'll like to stay at around 3k.
@@iptperformancetrans so I'm guessing it's the solenoids.
Is there a difference between the six and four cylinder 4eat?
There are a lot of differences among all 4EAT’s- clutch stacks, valve body calibration, final drive and transfer gear ratios etc
@@iptperformancetransis there a specific model and year that is best to build from?
@@jeremyclose705 The one from the car originally is best
Question regarding operation. I have a 2009 Subaru Impreza OBS, today I was out driving and went on a dirt road for shits and giggles (we’ve had lots of snow and it’s melting) I kept hitting tractor tire puddles which make the whole car shake. Long story short, I went back to my car from a Walmart I was driving to and while I was sitting at idle in park, I noticed what sounded like a knock coming from around where the cup holders are. The noise could be compared to coins in a dryer. What’s weird is it only does it if I’m in park or at a complete stop in D. When I got back to my dorm I sat for a good 6 minutes and didn’t hear it knocking again. Is my transmission completely fucked, or do I need to just change my tranny fluid? Is it a transmission mount?
Changing transmission fluid is not a repair, it’s maintenance That said, based on your symptoms you *may* have a cracked flexplate
@@iptperformancetrans so keep driving and pretend I don’t hear it 🫡
@@throbbingshaft Sure, do you. What I can tell you is when they go, it looks like the pilot on the converter will look like someone put it in a pencil sharpener
@@iptperformancetrans how do they break? I have a hard time believing my roaring EJ253 has enough oomph to really damage one.
@@throbbingshaft IDK why they break, it’s a weak part. It happens all the time
What kind of hp and torque can these builds handle?
They are good up to around 500hp
@@iptperformancetrans is there any difference performance-wise between the 04 Forester XT and the 2006 Baja XT with the VDC and the sport shift when fully built by you guys? I am really liking the option of having the sport shift. My build will be right around 500whp
John. Whats the best way to contact you personally?
⚙️sales(at)import performancetrans(dot)com
Hey john. I did send an email with a question i had. Really hope to get a reply from you!
@@mikev350z I don’t think that I got anything Sales@importperformancetrans.com
@@iptperformancetransCould you write down all the clearances and tolerances in the packages between the clutches and the steel. Not just low reverse. You take a measurement but don’t voice it. Thank you
Sales@importperformancetrans.com
Dude pass your arm routine! Or is it fixing gearboxes?
lol, transmission work doesn’t do much for that. I have a dedicated arm day, supersets of bi and tris- weighted dips, ez bar curls. overhead cable extensions and dumbell concentration curls. Cable push downs and I don’t know what they are called, like a 1 arm extension Check out @wyckedtraining he’s the man when it comes to technique I’m 54 btw