For my differentials I just use the store brand typically. The differentials aren't typically picky about the oil they're getting and even over a year the oil is still looking good. Grab locker additive from the store when you buy the gear oil. I use typically 80w-90. For the transfer case, use ATF+4 and call it a day.
Common TJ Maintenance Info
Here's a great writeup about typical fluids in a TJ. For the oil filter I use FRAM. Jerry got to actually tour the factory and was even impressed by they're quality. Avoid Purolator, I've destroyed those filters just trying to get them off. Others recommend the MOPAR filter, and you'll get even more suggestions.