The Firestone 2478 Ride-Rite Air Spring Kit is designed to maximize safe load carrying capacity, stability, and overall ride quality. It utilizes a pair of convoluted air springs, which can be adjusted for changing loads. They are capable of 5, 000 lbs. of load-leveling capacity and enhance your ride by reducing inter-leaf friction.• Levels off-center loads• Inflation valves allow side to side adjustment• Keeps leaf springs from permanent sagging under repeated or constant load• Reduces the chance of bottoming out• Increases vehicle stability encouraging steady, safe driving• Installs between the frame of your vehicle and the suspension• Provides load support through the use of air pressure• Maximizes vehicle load-carrying capacity• 8" minimum tire to frame clearance• Load Capacity: 5000 lbs.• Pressure Range: 5 to 100 PSI• All hardware is included for quick, easy installationNOTE: Do not exceed your vehicle gross vehicle weight rating. Compatibility2007-2009 Dodge Ram 3500 HD Cab Chassis 2WD, 4WD2010-2026 Ram 3500 HD Cab Chassis 2WD, 4WD Capable of 5, 000 lbs. of load-leveling capacity Keeps leaf springs from permanent sagging under repeated or constant load Installs between the frame of your vehicle and the suspension | 2478 Ride-Rite Rear Air Spring Kit