I did the calculator, 235/75/15 tires 29.8" tall give or take some for M/T tire and 'tire squat' or sag. I need a 3.73 or lower. I dont know much about differentials so if you could explain the different types and how they work that would be much appreciated.

A 3.73 turns up 2000 rpm at 55 mph. So anything 3.73 or lower would work nicely. I like the idea of a 3.54 or a 3
23 or maybe even a 3.08. But I dont want it to be so low that it becomes underwhelming. So I would like to keep it at 3.50 ish.

The 3.3L with a 3.8 crank and cam will be pushing close to 200-220 hp and 240-250 tq before the turbo. It weighs the same as a G54B. I can use a jeep ECU and be good to go. I wont be gunning it all the time, but every once in a while I might just enjoy my truck.