is for your differential, and I'm somewhat guessing that but pretty sure about the difference. Correct me if I'm wrong. See the two upper links for your transmission fluids. Differential is different.
I like to stick with Mobil 1, but to each his own. I'm sure you'll hear a bunch of oppioions though. Gdawg above is right about the types and what they are for. I think the manual transmissions take mercon ATF, but I would check your owners manual for the specific type, III, IV, etc.