Early GM trucks all came with 6 lug axles. Not only does this limit your wheel choices, but it restricts your options on brakes as well. Hurst Engineering is here with the solution of our 5-lug axle conversion kits. These kits include axles, axle seals/bearings, spider gears, drums, and studs. The axles are made from 1541H alloy for supreme strength and durability. This kit is designed for the 8.875 12-Bolt rear end with the axles featuring 30 spline ends, a 5x5" lug pattern, and are 30-3/4" in length. Look to Hurst Engineering for your truck axle needs.