The auburn like alex sed is in all lt1 cars and its a "clutch" style posi. They wear based on there inherit design. and I personally have broken spider gears in them. Not strong. And once they wear they are throw away. So now what do you do. A4 with not a lot of power plans in the future there are a few aftermarket differentials these days that are loads better then the stock pieces. Eaton sells one called the HD. That's a pretty good unit. And if people say 10 bolts don't hold up at all. Ask sam about running 10.50's on a stockkk 10 bolt! It can be done.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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