Hi Joefrazer. I'm just curious. What would fall out in the differential on a kaiser product that would get caught in the teeth. The rear axle is held in place by a retainer with, I believe, 5 bolts that hold the backing plate, the shims and the axle to the axle housing. Some other cars do have a large, and I mean large, "C" type clip that holds the axle in place but it can't get out with the spider gears in place. Just wondering.