Never bottom out again! The LoadLifter 5000 Ultimate offers all of the benefits of Air Lifts heaviest rated air spring PLUS a closed-cell, urethane foam jounce bumper. Located on the inside of the air spring, the jounce bumper absorbs shock, eliminates hard jarring on rough roads and protects vehicles carrying heavy loads or towing heavy trailers. These maintenance-free air springs can safely run with zero air pressure, thanks to the security of the internal jounce bumper. This replaces the factory jounce bumper that is sometimes removed when adding air springs. LoadLifter 5000 Ultimate works with your trucks leaf springs to provide up to 5, 000 lbs. of load leveling capacity* and keeps the vehicle stable, level and riding comfortable whether loaded or unloaded. The air springs are fully adjustable from 5 to 100 PSI. The LoadLifter 5000 Ultimate air springs are built like a tire - reinforced by durable, two-ply fabric for maximum strength. Exclusive upper and lower roll plates are included to protect the springs from sharp edges, such as brackets or the frame, and help increase load capacity by up to 10%.Each kit includes two air springs, mounting brackets, air lines, a Schrader valve, installation hardware and a fully illustrated, user-friendly instruction manual. There is a manufacturers lifetime warranty on all kit contents, including brackets, fittings and air lines, as well as a 60-day "No Questions Asked" Money Back Guarantee.* Never exceed mfr. recommended Gross Vehicle Weight Rating (GVRW) Up to 5, 000 lbs. of load-leveling capacity Does not fit commercial chassis applications | Air Lift LoadLifter 5000 Ultimate for 2015-2016 Ford F450 Super Duty Pickup