If you are lifting your Super Duty truck or already have lift kit installed on your Ford Super Duty truck and want to improve the ride, tracking and overall strength, reliability and performance of your truck then what you need are a set of Heavy Duty 4-Link Long Arms. These extremely tough Super Duty radius arms are constructed of thick 1/4" steel formed with a tabbed and slotted design for maximum strength. The long arm upgrade kit features tough replacement radius arms that will work from 2.5" - 6" lifts. Made of fully boxed 1/4'' steel and utilizing large 2-1/2'' greaseable urethane bushings, these arms are a considerable upgrade in strength from the stock arms. The arms bolt directly into the factory mounts, and position the axle for the proper caster and wheel location. And yes, allows you to add caster for a better alignment on lifted or leveled trucks.