5th gen Limited is still full time 4WD/AWD with locking CDL, same as the 4th gen V8 4x4's. V6 4th gens were only part time 4WD as well, only the V8's were full time (and possibly limited trim, not sure on that).
I have a GX470 (basically a 4th gen V8), and had a 5th gen Limited at the same...