i don't really know. it shocked me too! i haven't had a bit of problem out of it and i've hammered it as hard as my little 4.8 could. the only thing i can think of is i had my truck tuned back to stock for some warranty work and before i had the auto-track bull crap turned back off i got in a little mud and maybe it and the locker didn't like each other. but anyways one day at work i backed up and it rolled over it's self 3 times and came to a binding hault! so i drove it to get parts for work to see what the deal was and it lasted a while but roared loud and would click clickclick around turns and smooth out then go back to clicking in straight lines. when i finally made it back to the shop i backed up and it sounded like metal on metal.

later i took it to my girl friends shop and i popped the cover to just find stupid dirty fluid but no metal material. so i don't know what the deal was but i put the stock carrier back in and im gunna get it warrrantyed i hope through ron's where i bought it.