I don't know anything about EZ Lockers. I have had LockRights in both ends of my CJ-7 with 4.56 gears (rear has a Warn full floater), and have had zero problems with it.

As with any automatic locker in the front, don't engage the front axle if you're on icy roads with reverse camber. That's why an actuated locker (like an Air Locker) is probably better for a vehicle that spends most of its time on the street. -- but you'll pay about twice as much.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.