Air Suspension

About

Rear Air Spring Suspension Kits — Level Your Load, Tame the Sag A rear air spring suspension kit adds adjustable air springs to your truck's rear axle to support heavy loads, eliminate squat and sag, and keep your rig level and stable when towing or hauling. The kits in this collection are engineered for the hardest-working half-ton and three-quarter-ton trucks — Dodge RAM, Ford Super Duty and Chevrolet/GMC — so your truck rides composed empty and confident loaded. What Is a Rear Air Spring Kit? An air spring kit mounts reinforced, flexible air springs (air bags) between your rear axle and frame, in parallel with the factory leaf or coil springs. Each spring is inflated with air through a line that runs to an in-cab switch and compressor (or a manual fill valve). More air pressure = more support; less air = a softer ride. Instead of a fixed steel spring doing all the work, the air springs share the load and let you dial in the rear height and firmness for whatever you are carrying that day. The Problems Air Springs Solve If any of these sound familiar, your rear suspension is asking for help: The rear squats when you hook up a trailer. The nose lifts, your headlights point at oncoming traffic, and the steering goes light and vague — an unsafe combination at highway speeds. The truck bottoms out over bumps when loaded. Leaf springs that are maxed out have nothing left to absorb a dip, so the axle bangs the bump stops and the whole cab jars. The trailer sways and porpoises. With the rear overloaded and soft, a crosswind or a semi's wake walks the trailer side to side and the back end pumps up and down. Your daily commute rides harsh. Stiffer overload springs that were fine for the job site make every pothole unpleasant when the bed is empty. The truck sits permanently low. Older trucks with tired, sagging factory springs develop a permanent nose-high rake that looks wrong and hurts handling. Every load is different. Monday it is an empty commute; Friday it is a camper