I have an ARB locker in the front with the alloy housing and an auto, no breakages yet. I actually reckon the air locker can help save the front end when locked in and the auto doesn't hurt either. When one wheel is airborne it's not spinning any faster than the one on the ground so when it comes back down it's not doing some insane speed on contact. The auto also takes the shock loading out of the driveline compared to a manual. Just my thoughts.