A friend of mine just picked up a 1999 Wrangler and was driving it home and the rear is making a grinding noise around turns. Does any one know how to fix it if the locker is engaged.

 

factory there was no locker, a limited slip maybe;

if its after market; you may have to pop the cover to see what's going on in there...

could be an after market one that blew up, or possibly some gears gone bad...

is it for sure coming from the diff?

 

Limited slip rear sorry.