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Old 05-20-2020, 08:42 AM   #1
PittISDTech39
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Default Transmission Swap/Compatibility

Hi All, long time lurker, first time poster here.

I know there are a few threads around about this topic, but I haven't been able to find enough information to make me feel confident purchasing a used transmission. I have an '09 Impreza 2.5I (non-turbo) wagon that has a failing 5 speed tranny and center diff. I've read a couple different things that have said I can drop any subie 5spd MT in as long as the final drive ratio matches that of the rear diff and that it matches if its a Push/Pull type clutch. Using the Rallispec chart, Ive found that my trans (TY758VC1AA) has a FD of 3.90, but I don't know if it's a push or pull. Am I missing any other pertinent info that would make a difference before pulling the plug on a used tranny? And are JDM transmissions compatible with our USDM motors (EJ253)? I've found a few JDM transmissions with the correct final drive that are alluring due to their low mileage and they tend to be less expensive. Thanks in advance for any input!
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Old 05-20-2020, 11:33 AM   #2
Jedi03
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go 6 speed an get the rear end to match!
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Old 05-20-2020, 01:08 PM   #3
snow_bound26
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You have a push type clutch. You can tell by looking at the slave cylinder. If the piston points at the engine then it's a pull type. Points toward the firewall than push type.

As for FD, you have to find out if your trans is a 1:1 or a 1.1:1 (more common). 1.1:1 has a 3.54 rear diff for a 3.9 FD.
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Old 05-21-2020, 07:56 AM   #4
PittISDTech39
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Quote:
Originally Posted by Jedi03 View Post
go 6 speed an get the rear end to match!
Wouldn't that be nice!
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Old 05-21-2020, 07:57 AM   #5
PittISDTech39
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Thanks Snow! I'll start trying to figure out if it's 1:1:1.
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Old 05-23-2020, 11:10 AM   #6
Samurai Jack
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TY758VC1AA

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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Old 05-24-2020, 05:58 PM   #7
PittISDTech39
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Quote:
Originally Posted by Samurai Jack View Post
TY758VC1AA

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.
I appreciate this info! I initially missed the T.R. column on the Rallispec chart but was able to pick it out eventually. The other info I was uncertain about was the rear diff, because that info is missing on the chart for this tranny part number, so you were able to identify it for me! I was able to find a low mileage JDM transmission that should work from Sunshine State JDM down in florida with all your help. Thanks again!
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