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Re: 12 bolt power limit questions
The GM Truck 12-bolt is a VERY stout rear end. I've been pounding one with a 396 and a 427 for years and it's held up nicely. I welded the tubes, replaced the trailing arm perches with CaptainFab's perches, and added the Moser cover. They are VERY reliable. The day I break mine is the day a full floater Dana 60 or Corporate 14-bolt will go under the truck, just rubs me wrong to stick a Dorf anything under my Chevy... 
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Michael of the clan Hill,
"Two Seventy Two's"
71 1-ton Dually 350 4-Speed
71 C/50 Grain Truck, 350 Split-Axle 4-Speed
02 3/4 ton Express
14 Indian Chief Vintage
1952 Ford 8N, "Only Ford Allowed On The Property"
"Be American, Buy American" 
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