In my 97TJ's with 5 speeds and my 98XJ with 5 speed I run redline MT90, it is a GL3-4 rated oil that has very low levels of sulfur in it, GL5,6 rated have high levels of sulfur which eat the synchro's in the asin trannies. The redline is also a synthetic which makes it much nicer in cold weather. Either that or stick with the dealer OEM oil.
For the transfer case, I run Mobil-1 ATF in all of my NP231's and the 242 in our 97ZJ.
If a gear lube says it meets GL2,3,4,5,6 ratings, like Coastal oil sold in advanced auto, they are lying, it either has sulfur to meet the 5 and 6 ratings or it does not.
If you have an auto tranny just go with what the owners manual tells you to.