Rear Diff compatability

[turboboxer92]

What is better to rebuild a bad rear diff or replace? Also what years will work and what is the gear ratio?


I had recently replaced my rear cv axles and they were extremely worn. There is still a lot of noise coming from the rear and I feel that its the differential. That could be why the axles went bad in the first place who knows... I don't know what will work as a replacement and are certain years the same? I know they are really inexpensive for used ones I was wondering which ones will fit please help.

[rallyak]

The ones that are a straight swap are 90-94s, you need to check ratio. 90-91 5spd and 4eats are 4.11, 92-94 4eats is 3.90.

My self I'm replacing mine right now with a 01 legacy gt vlsd rear end w/95-99 outback axels, I've done this on my other car and its a nice up grade, and I believe it run smoother.

[cj91legss]

Although rallyak gave you some great information, You haven't given us any information about your car. Yes this is an 89-94 Legacy forum, we have many users from later models. We will need more information from you before we can chime in with solid answers.

[turboboxer92]

ohh sorry about that its a 92 ss 4eat. I don't think that there would a be a need to upgrade unless it will fit without modification. I was wondering if anyone rebuilds rear ends on these or just replaces. The rear cv's are brand new so It would be nice not to hanve to yet find another pair. Side thought the abs wouldn't have anything to do with this binding issue in the back would it otherwise Im stumped.

[cj91legss]

Its probably less of a hassle to find a replacement.

[Legacy777]

All the turbo models 91-94 had 3.90 final drive rear ends. Only the 91 had a VLSD. You should be able to easily find a 3.90 rear end.

I will say though, that these rear ends don't typically go out, so your noise may be a wheel bearing (more common). You may want to see if you can confirm the noise is coming from the rear diff before replacing it.