yea i've used them for over 10 years, more usefull for front digs, works pretty good. have to be really coordinated to use as a cutting brake, but possible. just a detroit in the rear, still works with the locks, as long as rear shaft disconnected- no torque to lock the detroit, still like an open diff. arb in the front though. will be locks on each wheel. also a great parking brake; i rarely put my rig in park on the trail, always use the locks when pausing somewhere. another good use is in severe downhills i lock the rear brakes at half pedal or so, gives me alil more control. or you can lock the brakes out if the situation calls for it. each lock bout $60.