Ok. Course I have used search button, but never came up with anything that made me 100% on what to use. From what I gathered, I use 75W90 in the front diff and in the rear a syntetic 75W140 with a friction modifier. Correct? Also what does the t-case take as in fluids? I'm doing just small routine maintence right now such as chaning diffs, t-case, fuel filter, and PCV. Is there any other small tune-up like thing I should change(excluding plugs, wires)?

Thank ya

 

Use 75w90 SYNTHETIC in the front and you've got it right on the rear. The T-case uses regular mercon, NOT mercon V.