I've tried a auto locker in the rear of my JK after having great success with them in prev 4wds. It was horrible, I had extremely loud bangs at random times ALL the time. This included when cruising in 6th gear at 110kmh in a straight line. Every time it would bang it would try and steer the JK from the rear and if not paying attention I would end up on the other side of the road.
I've had auto lockers in the rear before, with no prob whatsover, including installing them myself. All same brand too by 4wd Systems in South Aust. This last locker was installed by a reputable workshop, I pulled the diff cover and checked the tolernaces myself, and I went back and had them recheck the tolerances etc as well, everything seemed within spec but they swapped the shims anyway to loosen it up a little but no improvement. In the end I had it swapped out for a e-locker.
I have no experience with a auto locker in the front, but judging by what others have said I wouldn't do it. Selectable or tight LSD is the way to go.
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