Do you mean the preload bolts? Mine don't come loose, the cover bolts stay tight also. I did have some gear oil seeping past the preload bolt threads, but I wrapped some teflon tape around the threads and it's been OK ever since.



(ooold pic, tailpipes and Z71 shocks are long gone, and the truck is 4 or so inches lower back there now)...undercarriage is even rustier now too lol