legacycentral bbs

So i'm gunna be changing my diff oil soon, and i was just wounding what type of diff oil is everyone using.

the book says 80w-90, but i have 75w-90 at work and it would be easier to use that, but if 80w-90 is what has to be used then that what i'll use

the front and rear diff in a 90 auto
thanks

In about two weeks when I get this LSD back together I'll be trying out some Amsoil 75x90. We'll see how it goes.

Depends on what diff you're referring to.

The front diff in the AT
The rear diff
The MT