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Old 10-02-2016, 11:46 AM   #1
570Justin
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Member#: 453412
Join Date: Aug 2016
Location: Dallas, Pennsylvania
Vehicle:
2008 Impreza 2.5i
BMW Alpine White

Question 2008 2.5i Final Drive Gear Ratio

Hello and thanks for viewing, unfortunately it looks like ill need to replace my rear diff looking through all of the service manuals i could find nothing about my 2.5i 5MT Hatchback. It seems like (at least the websites ive found) subaru only offers specifications for the 2.0i and the 2.5 turbo but mine is a 2.5 NA. I really dont want to buy one and find out its the wrong ratio. Ive checked:
http://jdmfsm.info/Auto/Japan/Subaru...008/index.html
http://techinfo.subaru.com/proxy/695...5M0812A_19.pdf
and a couple more that ive already closed off my tabs.

It would be so helpful if someone could help me out here or even point me in the right direction. I thought it was 3.54 but again I dont want to waste money, I dont really have much to spend in the first place. Also if there is a true Rear Dif guru out there would they be able to let me know if there are any wrx'/s that cross thread with the same ratio? Thanks a bunch guys!
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Old 10-05-2016, 11:55 AM   #2
570Justin
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For those who are wondering the ratio is 3.90, it is shared with the 05-09 legacy as well as the 08-14 impreza and wrx
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Old 04-18-2017, 01:27 AM   #3
terrainasaurus
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2008 OB(Wan)S
OBP/DGM 2-toner

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Quote:
Originally Posted by 570Justin View Post
For those who are wondering the ratio is 3.90, it is shared with the 05-09 legacy as well as the 08-14 impreza and wrx
Hey Justin!

Do you know what kind of rear diff you've got? I'm thinking the MY08 OBS and 2.5i are the same...
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