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Old 05-23-2020, 11:10 AM   #6
Samurai Jack
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
2002 Enemy of Aku



US Impreza 2008
You have a Transfer Ratio of 1.0 and a Final Drive of 3.90.
That means you need a Rear Diff with a 3:90 ( R160 ) to match.

You have to match the transmission to the rear diff, like I showed above. All the info is on the Rallispec chart you looked at.

Can you use any USDM or JDM transmission ( 5MT or 6MT ) with a USDM motor?
The answer is "yes you can".

If you go to a 6MT, then you will need a 6MT clutch, 6MT flywheel, 6MT driveshaft, whether or not you use your current rear diff ( R160 ) or get a 6MT ( R180 ) rear diff.
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