If you are looking for a 6spd one... steer clear of any that pop out of reverse. Means the internal shift rails are bent (often from a 6th/Reverse mis-shift) and there's no easy fix. Rebuild or replace.
2005 is the last year you could get without ABS. One less 'feature' to give you grief.
Rear disc brakes were optional in the early years. (02-04?)
There's (at least) 2 different transfer cases too... I have the simpler part-time one with a lever (NP241) which has only 2wd, 4Hi, N, 4Lo.