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Old 04-08-2013, 11:59 AM   #1
PurpleSauceGDA
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Default JDM vs. USDM 5 speed

hey guys, so my usdm 04 wrx's transmission is kaput. i now have a jdm replacement, i am aware the ratios are different however i cannot find what differential i need to make this setup work. or can i use my usdm diff with some sort of modification? etc..

thanks in advance for any help
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Old 04-08-2013, 12:40 PM   #2
Dirtyhobo010
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You will need a lot more information for someone to properly answer your question. Just saying a "jdm replacement" isn't enough. What year jdm trans did you get? Is it a 5 speed or a 6 speed?

I'm guessing you bought a 5 speed jdm transmission which usually had a 4.44 gear ratio. To put this in you would need to first buy a 4.44 rear end to match.
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Old 04-08-2013, 12:49 PM   #3
skets
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Is there any difference with the gears themselves?
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Old 04-08-2013, 12:54 PM   #4
mhoerath
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Old 04-08-2013, 05:27 PM   #5
PurpleSauceGDA
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Quote:
Originally Posted by Dirtyhobo010 View Post
You will need a lot more information for someone to properly answer your question. Just saying a "jdm replacement" isn't enough. What year jdm trans did you get? Is it a 5 speed or a 6 speed?

I'm guessing you bought a 5 speed jdm transmission which usually had a 4.44 gear ratio. To put this in you would need to first buy a 4.44 rear end to match.
yes it is a 5 speed, 4.44 rear end which you can source from a forester? or a baja turbo? if my research is correct. i suppose my question at this point is will my stock axels fit or will i need to modify/replace them?
thanks,
matt
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Old 04-08-2013, 05:45 PM   #6
Dirtyhobo010
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Stock axels and DS from an 04 wrx should work without a problem. You can pull the rear diff cover off to verify the ratio when sourcing your new diff.
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Old 04-08-2013, 07:52 PM   #7
PurpleSauceGDA
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Quote:
Originally Posted by Dirtyhobo010 View Post
Stock axels and DS from an 04 wrx should work without a problem. You can pull the rear diff cover off to verify the ratio when sourcing your new diff.
fantastic, thanks guys ill let you know how it goes
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Old 04-09-2013, 05:48 AM   #8
Uncle Scotty
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4.44 gears are gonna be REAL short and you will NOT like cruizin on the highway at 4xxx rpms
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