For differential fluid I used Mobil 1 75-90 I think. (that was 20k miles ago). Cant' comment on the tranny fluid, i have a different model. Go check the tips-n-tricks (FAQ?) section (go to the homepage, you'll see a link for it) They should explain all you need to know there.

Good call on the diff and tranny fluid changes. Not a bad time to do transfer case as well...I think ECS tuning sells transfer case fluid.