I just ordered a MGW short throw shifter with inner dust boot, and 4.10 gears with small install kit, including gaskets, and a few bolts i think. but what else do i need for the install I am planning on doing them my self. gear oil, and new diff cover, what is this lube for the posi I hear about. also what tuner should I get. how much of a difference will all 3 of these things make separately and together. thanks for the help im new.