OSKALOOSA, IOWA – Kelderman Manufacturing’s 4-Link Air Ride Suspension Kits are now available for GMC 4500 and 5500 trucks. The bolt-on kit has been designed to smooth out the bumps in the road while keeping the truck bed level, even with the addition of heavy payloads. Designed with an electronic automatic height control unit with an air dump feature, Kelderman’s kit features parallel trailing arms to eliminate axle twist and minimize pinion angle movement, transferring power to the ground for a more stable, comfortable ride. The factory sway bar is not removed. Kelderman uses quality Firestone airbags and provides wiring harness, bolts, hardware, and nstructions, making this a do-it-yourself project. A tech department is available Monday through Friday to assist with installation.