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Old 12-08-2011, 03:24 AM   #1
Scooby Newbie
Member#: 303291
Join Date: Dec 2011
Lightbulb JDM Version 9 2007 Spec C Rasc+Rar (Matching Diff??)

Ok So i ordered a new 6 speed transmission from Nagano japanese from montreal. I am swaping it into my 02 usd wrx. They sent me the transmission JDM Version 9 2007 Spec C Rasc+Rar TY856WB8JA.. And a matching Diff. Well i hope? On the diff was written 3.9 but when i opened it it was a 3.54 gear set. It is a R180 LSD with a 3.54 gear set, Now my question is what rear diff gearing do i need for this 2007 spec C rar, 3.9 or 3.54 Unfortanuately the dealer is dumb and dosent know... Does anyone know if the centre diff is a 1.1.1 like a wrx because they have a final drive of 3.9 but because of the 1.1.1 centre diff they run a 3.54 rear diff. I have searched forum after forum and no informaiton is avaliable. Does anyone know for sure? dont want to fry the transmission!
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Old 12-08-2011, 10:09 AM   #2
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Chapter/Region: SWIC
Location: AZ
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Give Rallispec a call. I can't seem to find that transmission code in my resources, but they might know. Great guys over there. If it's anything like the USDM 07 STi's, it's a 3.54, but JDM land is often different.
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Old 12-09-2011, 01:14 PM   #3
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Talking Heres The Answer!

Well turns out that you need a r180 3.54 diff gearing and the transmission has a 3.9 final with a 1.1.1 centre diff. I would just like to thank DAVE at ralli spec for the information and help i would be totally lost without you!!! Thankyou verry verry much!
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Old 03-01-2013, 08:59 PM   #4
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