gear oil help!
First off, I know the answers probably already been answered but I can't find it. Sorry in advance. I need to change the front and rear diff fluid and I just want to make sure Im using the right fluid. Im driving a 94 4x4 with 135k miles. Just bought it so not sure when last service was, if ever. I picked up some valvoline 80w90 with limited slip additive for the front. I didnt realize that it had the LS add until I got home. Is that ok to use in the front. and then what to use in the rear? I am using a syn atf for the trans case as well. I have seen discussions about this, but it seems to all be for 99 and newer. Just making sure im putting the right stuff in. Thanks for the help!