Most information about fluids, quantities, and torque specs can be found in the
general information thread.
Use any 75W-90 GL-5 gear oil for your differentials. Most contain LS additive already. You can get Mobil 1 LS 75W-90 for cheap at Advance Auto if you order online using
discount codes then pick up in store. You'll need 5 quarts of the fluid, and I'd suggest getting
a fluid pump too to ease filling the diffs.
Use Nissan Matic D (preferable) or any fluid that states Dexron III / Matic D compatibility for the transfer case and the transmission.