I would stay away from the locker if you dont want to go with the ARB. I had a Detroit in my ZJ and it was great offroad, but sucked in snow and ice, also ate tires pretty quick. Whats wrong with the QTII system? If I am correct the ARB acts as a limited slip when not engaged, and gives you the option of a fully locked axel when turned on. Plus you get onboard Air.

My $.02 hope it helps