Is the differential fluid separate from the tranny fluid?

[SaltyBeefCubes]

In my 90 legacy fwd the tranny is making a gear wind noise. I noticed there is a differential dip stick and I never put fluid in it. I just filled the entire transmission up with oil assuming it was included. So my question is: does the differential need to be filled up as well via the dip stick tube?

[SaltyBeefCubes]

Mother of god...they are separate. Hopefully it hasn't been completely wrecked by my idiocy. Will normal tranny fluid work?

[SaltyBeefCubes]

Also, just kidding as well. It's 80w oil. Please disregard noob post.

[Dave_J]

Well, now your post count is at 40.

You can use any good 75W90 in both Dif's and the Transfer case. Just don't put it on your Mashed Potatoes, tastes bad.

[Legacy777]

For some reason the AT differentials call for 80w90. 75w90 should work as well.