If this is a 2001, it has a center diff lock not a rear locker. Only '96-'00 have the rear locker. There would be a diff lock button to the left of the steering wheel on the dash, which if yours is a '01, it wouldn't have it. Just wanted to help you avoid any confusion.
T-case Differences (all years of 3rd gens).. transfer case, AWD, multi-mode
GLWS, that's a sharp looking runner!