Transmission and rear end swap
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This is a discussion on Transmission and rear end swap within the Transmission & AWD forums, part of the Tech & Modifying & General Repairs category; Hey all, I have a 02 wrx and broke the stock 5speed so there's a local jdm shop that I ...

  1. #1
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    Transmission and rear end swap

    Hey all, I have a 02 wrx and broke the stock 5speed so there's a local jdm shop that I got a tranny and rear end from. I got told the rear matches the tranny but the test drive doesn't seem so. It was supposed to be swapped to a 4.44 final drive and the tranny number is saying its a 4.44....so my question is other than pulling the rear diff cover can it be identified? There is a stamped number on the bottom, kn31. Any help would be really great!

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  3. #2
    He simply abides. SD_GR's Avatar
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    Sorry, I've lost you. If your car has a 5spd, then the diff is a 4.11 ratio. Are you saying you're swapping both a final gearbox output ratio and a diff ratio to 4.44?

    The 4.44 ratios were used in atmospherically aspirated automatic transmission cars with the 2,5l motor and in some manual STi cars; however in the latter case the diff would be a R180. Do you have an R180 or R160?
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    Subaru Newb MainFrame's Avatar
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    If you are having a problem take it up with the shop. They did the work, they have a responsibility to be sure the car is functioning correctly before releasing the car to you. What does their warranty information say?

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    Yea, I'm changing both to a 4.44. Its a jdm forester xt tranny and its a r160. The shop is just an import shop. They don't do work and I don't let anybody work on my car. I do all the work myself

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    Luke Skywalker Mikie13's Avatar
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    Ohh so you only bought through them...they didn't do any work.
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    Quote Originally Posted by Mikie13 View Post
    Ohh so you only bought through them...they didn't do any work.
    Yea, just bought from them

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    He simply abides. SD_GR's Avatar
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    Do you have a US R160 side by side? The housing on the inside should be trimmed by Subaru themselves on the import if the import had the 40 ring and 9 pinion (4.44). Even this isn't reliable though, and I don't know of an external way to tell. Then again, if you can see a 40 ring and 9 pinion that answers your question, although by then you've opened the thing. Doh! I'm thinking in circles, sorry.

    EDIT: Wait. You said Forester. Are you sure you have a mechanical LSD? I'm getting more confused now. When you spin one axle forward, the other axle should also go forward, right?
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    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
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    Quote Originally Posted by SD_GR View Post
    Do you have a US R160 side by side? The housing on the inside should be trimmed by Subaru themselves on the import if the import had the 40 ring and 9 pinion (4.44). Even this isn't reliable though, and I don't know of an external way to tell. Then again, if you can see a 40 ring and 9 pinion that answers your question, although by then you've opened the thing. Doh! I'm thinking in circles, sorry.

    EDIT: Wait. You said Forester. Are you sure you have a mechanical LSD? I'm getting more confused now. When you spin one axle forward, the other axle should also go forward, right?
    I have the stock rear diff, but if I had a 180 my axles wouldn't fit..but they do fit. If I were to spin a front wheel the other front would go back

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  10. #9
    He simply abides. SD_GR's Avatar
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    That's because the front diff is open, not LSD.
    WRX Info Links, Courtesy TheJ
    The world breaks everyone and afterward many are strong in the broken places. Ernest Hemingway
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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