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Re: GM 12-Bolt Advice Needed
Tell you a rear-end story from my own experience as a Chevy guy for decades.
The 12-bolt is MARGINAL for the abuse of drag racing. An acquaintance was going through two or three per season in his 4-speed, wheel-standing Pro Stock '70 Camaro.
He switched to a Ford 9-inch, which would go for a whole season, but no further.
He finally settled on the Mopar 8 3/4. It has bigger bearings than any other passenger-car unit. One of the reasons Chrysler almost went broke in the early '80's was they put this SAME studly pumpkin in everything from Slant 6 Valiants to 440 Roadrunners; only difference was axle length. (Hemis often got Dana 60 truck set-ups)
After 150,000 miles behind a 6 or 273 2-barrel, these rear ends are like NEW and CHEAP in the junkyard. After a pro rebuild they are half the cost of a 12-bolt or 9-inch.
My friend's race car gets 2-3 YEARS from these "secret weapons", and one of them is bulletproof in my son's 400+ hp '63 Chevy II 100 post.
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