RCD's system comes with CNC machined replacement cast iron steering knuckles for precise steering geometry. Fully machined, T-6 Billet Aluminum axle spacers maintain proper axle lengths. Heavy Duty two piece lower sub-frame assembly and a polished stainless steel 'Twin-Link' anti-compression struts insure structural strength and durability. CNC machined, zinc plated billet steel 'Super-Flex' sway bar end links feature an upper ball joint assembly for smooth operation, optimizing sway bar geometry and function. All the steel has a 'Gator Black' polyurethane powder coat finish for lasting good looks! Grade 8 Hardware for reliability. This system also comes with Bilstein 5100 shocks that provide unmatched ride quality. No drive shaft modifications are necessary. Trucks equipped with a 2-piece rear drive shaft may require a drive shaft support drop down bracket for the factory carrier bearing. Any non-HD vehicle made before 8-1-00 will need to upgrade to larger tie rod kit.