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Re: 1/2 ton Vs. 3/4 ton
the 14 bolt came out in the 73 - 87 trucks. Standard rear on a 3/4 ton was the eaton HO52, and dana as an option. Dana was standard in big block 3/4 ton trucks.
The frames are the same with added braces, and a lower rear cab mount (pick up only)
Coils were standard (chevy) on both 1/2 ton and 3/4 ton... optional leafs on both. GMC's were leaf standard on most years, with coils optional.
The front suspention is of the same type, but the 20 series was beefed up over the 10 series.
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