Firestone W21-760-2071 Ride-Rite Air Helper Spring 1973-1987 Chevrolet/GMC Pick Up trucks C&R 10, 1500 (2WD only),1969-2002 Dodge Pickup Trucks D&W 100, 150, 250, Ram 1500 (2WD, 4WD)Ram 2500, 3500 (2WD, 4WD),1969-1996 F-250 Under 8500 GVWR(4x2, 4x4)1963-2010 F-250 Over 8500 GVWR(4x2, 4x4)&1969-2010 F-350 These air springs are capable of 3000 - 5000 pounds of load carrying Under no circumstances do we recommend exceeding the manufacturer's Gross Vehicle Weight Rating (GVWR) Ride-Rite & Sport-Rite Air Helper Springs can be installed on most light trucks, RVs and vans, Ride-Rite and Sport-Rite Air Helper Springs are installed between the frame of the suspension providing load support through the use of air pressure