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, a car trailer or a bed full of gravel. A fixed spring can't be right for both. Why Add Rear Air Springs? Level under load — stops the rear from squatting, keeps headlights aimed down the road and steering weighted More stable towing — reduces body roll, porpoising and bottoming out so the trailer tracks straight Adjustable support — air up for heavy loads, air down for a softer empty-road ride Protects your truck — less sag means less strain on leaf springs, shocks and driveline angles Bolt-on install — mounts to the existing rear suspension with no welding; air lines run to a compressor and switch or a manual fill valve Not a Lift — A Load-Leveling Upgrade Air springs are a leveling and load-support solution, not a full suspension lift . They restore factory ride height under load and reduce sag, keeping your headlights pointed down the road and your trailer tracking straight — without raising the truck beyond its intended range when unloaded. Find Your Fitment Each kit is built to a specific year, make and model, so fitment is simple: match your truck to the list below. Covers the 2014-2022 RAM 2500 , 2011-2016 Ford F250/F350 Super Duty , 2001-2010 Chevy/GMC 2500HD and 1999-2018 Chevy/GMC 1500 . Not sure which kit you need? Confirm your truck's year and axle before ordering. Why Choose SPELAB Air Springs Truck-specific kits — no universal guesswork, direct-fit for the Big 3 diesel and gas platforms Durable construction — built to handle repeated load cycles and harsh road conditions Direct manufacturer pricing — no middleman markup Straightforward install — bolt-on design with included hardware for a weekend DIY Always follow your vehicle's gross axle weight rating (GAWR) and load the air springs within their rated capacity. Proper inflation and routine inspection keep your setup safe and reliable.
Source: https://www.spelabautoparts.com/collections/air-suspension