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Posted: **Tue Sep 12, 2006 10:09 pm**

I recently purchased a used Rear LSD from Matt Monson out of a '91 Turbo Legacy sedan which I'll clean-up and re-build with new seals and gasket.
Question is will it change the final drive ratio???
I am putting it my BF '91 NA 5 spd. manual Leggy wagon if it all works out OK
Comments???
Previous experience???
and yes, I did a search and I read the sticky

Posted: **Wed Sep 13, 2006 12:32 am**

The '91 SS VLSD is a 3.9 ratio. I believe the N/A 5MTs are a 4.11, like oil and water the two DONT mix.

You are going to need a SS/TW (turbo) 5 speed trans... or you may be able to rebuild the rear diff with the VLSD carrier and a set of 4:11 gears, a lot of work and tricky to get set up right. If you wanna keep your 4.11 5MT there are 4.11 LSDs, I think they come from USDM/JDM WRXs.

Gary

Posted: **Wed Sep 13, 2006 12:59 am**

The 00-01 2.5 RS and 00-04 Legacy GT have 4.11 VLSD.

Posted: **Wed Sep 13, 2006 4:58 am**

N/A 91 4EAT's are 4.11 Final.

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LSD final drive ratio '91 Leg.

LSD final drive ratio '91 Leg.