How do you know what kind of diff you have?
We bought a 96 grand a little while ago and was wondering how do you tell what kind of diff is in the back. I want change all the oils (diffs, transfer case etc) in this thing but on the rear it says to put in the additive if it has a certain diff. Also is their anything special about the atf listed in the owners manual? Or can i use an aftermarket fluid?