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Subaru Diff Clarification


corey_49

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  • 2 years later...
  • 4 years later...

@madkaw

 

i have the same axles as Derek, and a 17’ 3.54 STI Torsten (helical). I believe they were 3.9 and a clutch-type LSD from 05-07’, then all the future models (until last year to my knowledge) were 3.54’s. 
 

you will need shorter mounting studs on the diff cover. Swap your OEM studs with the longer Subbie studs, or buy new from Zcardepot. 

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2 hours ago, AydinZ71 said:

@madkaw

 

i have the same axles as Derek, and a 17’ 3.54 STI Torsten (helical). I believe they were 3.9 and a clutch-type LSD from 05-07’, then all the future models (until last year to my knowledge) were 3.54’s. 
 

you will need shorter mounting studs on the diff cover. Swap your OEM studs with the longer Subbie studs, or buy new from Zcardepot. 

I ran the clutch 3.90 before , but going torsion this time. I just bought a used ‘18 myself 

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I belong to several Subaru forums, and have bookmarked several good discussions on the topic over the years.  Here's a couple for anyone wanting to salvage an LSD diff:

https://forums.nasioc.com/forums/showthread.php?t=2597453

https://forums.nasioc.com/forums/showthread.php?t=1969700

http://legacycentral.org/library/literature/differential.htm#Which Subarus do I look at to find an LSD

 

Last time I checked, John Williams was offering the best price on adapter side axles, if retaining the stock half-shafts.  Futofab also offers them, but the sources are drying up.  Sadly, Fritz is no longer producing the integrated CV axles that @Derek and @AydinZ71 refer to (DatsunRestoMods)....I'm guessing he didn't sell enough to make it worthwhile.  (Just recently saw that T3 is marketing CV axles that appear very similar to the DatsunRestoMod units:  

https://technotoytuning.com/nissan/260z/long-nose-r180r200-cv-axles-240260280z)

 

FWIW, I've been running a 3.54 Torsen with John W's adapter side axles in my last two cars for several years issue-free.  Modest power with decent torque numbers and very sticky rubber in a variety of road course and auto-x applications.  

 

Hope this info helps for anyone considering the swap.

Edited by jhm
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