The transfer case requires ATF. Any type of ATF is fine. If you are having trouble picking out one, just go for a major brand of ATF+4 like Valvoline, Castrol, etc.
For the axles, pretty much any GL-5 is fine. A 75W-90 is a good all around choice, the exact viscosity is not all that important. 70W-80, 80W-90, 75W-90 etc. are all fine. I am not including heavier viscosities since it's unlikely you're towing a heavy trailer behind your Jeep. Valvoline is good, as is Castrol, Shell, Mobil, etc. All modern gear lubes are very good at protecting your axle's gears.
If your transmission is a manual, a very good gear lube for it is Redline MT-90 which is available from Summit Racing. The factory has also added synthetic 10W-30 motor oil as a suitable gear lube as well which is of course far easier to find locally.
If your transmission is an automatic, use ONLY ATF+4 in it.
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