Differentials no different than any other vehicle. Limited, you need the LSD additive. For the front diff, you need a 14MM allen. Be sure you can remove the fill before you remove the drain. Transfer case normal as well. Drain and fill bolts. Rear you need to remove the cover. Need soem RTV gasket maker to seal it up. Also, for the front, some get a oil pump, a cheap plastic one, make it a lot easier to fill.
FWIW: The search button is your frioend. Lots of info here.
Here's a maintenance shedule and parts: