Well my rear end was acting funny today so I went to change the fluid and found spider gear teeth in the bottom of the housing. So I have did some searching on the TDR and found that is common when u start sled pulling. And with 262,000 miles on the rear end and 5 hooks that was all it took. I see alot of good talk on the detroit locker so I am leaning towards that. But I have not found where the best place to get one for the money (cheapest) is??? So If u have a good source hook a TDR member up..... Thanks Justin