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There’s nothing but proven GM strength out back in the form of a ’75 3/4-ton 14-bolt with a 10 1/2-inch ring gear and full-floating axles. Four pounds of welding rod went into the differential gears to lock the rear tires together. The 38s are motivated by 4.56 gears and slowed by 13-inch drum brakes. Lift height is simple and comes from 4-inch Pro Comp blocks working with stock springs and Pro Comp shocks.