Rear Differential

It depends on how much damage was done to the 'hard parts' meaning the gears and housing. If it is just worn out bearings, $500-600 is reasonable. ( it is a labor intensive job ). If the gear set is damaged, it could run up to $1000-1100. If the housing is damaged, then you may need a new unit, which is even more. I hope for your sake, it is just the bearings. Good Luck!