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Message: [QUOTE="Highbeam, post: 241841, member: 23735"] The stock rear end on a half ton is the open 10-bolt, that's what the salesman said. If you have the only "locker" GM offers you will have a G80 code stamped on the sticker in your glove box. It is the gov-lok locker made by Eaton. Power will go to both wheels until one starts to slip. I've seen many trucks with open rear ends do 2 tire dirt burnouts only because both tires have equally poor/good traction. [/QUOTE]