Swapping In 3/4-Ton Axles
A GM Corporate 14-bolt is found under 3/4- and 1-ton two- and four-wheel-drive trucks, making them fairly common. They were also used under dualies and vans, but these have different overall widths from regular pickups and Blazers, and the spring perches are in different locations. If you're doing a swap on a 1973-1987 truck, Blazer, or Suburban and are looking at one that's not bolted in a truck, the rearend you want is 72 inches from end to end (measuring from the end of the axle-retaining bolts), 66-1/2 inches from wheel flange to wheel flange (with drum brakes), and the leaf-spring centering-pin holes are 42-3/4 inches apart. For 1967-1972 trucks, Blazers, and Suburbans, you'll need one 70-3/4 inches wide, 66-3/4 inches from flange to flange, and 40 inches from pin to pin. View Related Article
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