You only really need lock ring pliers to do anything on the t-case. Some seal/race drivers certainly help.
If you snapped the output shaft, you probably need to look at an SYE and double cardan rear driveshaft conversion. The rear output shaft is not weak and usually breaks when subjected to a lot of angular load, which happens with suspension lift and keeping the stock driveshaft. In other words, if you broke one, you'll break another.
Gears on the output shaft are nothing special, they are just slid onto their splines and held in place with a snap ring. The 4x4 sprocket has caged needle bearings in it on all years except late 94 and 95. If you get a late model YJ output shaft you will need to remove the caged bearings and the sprocket will then just spin on the output shaft itself.
