Rear Drop Kit 3" Lowering Blocks for GMC C15/C1500 C25 for Chevy C20 C10 1963-1972 50020612Introduction: Both lifts and leveling kits are designed to raise the truck body away from the axles to fit larger tires and increase ground clearance. A leveling kit involves hardware to slightly raise the front of the vehicle so it matches the stock height in the back. Feature: For use on short wheel base, one piece drive line pickups with 5" drop or more Adjustable for up to 4 degrees of anti squat Lower hole is for factory trailing arm position