Product information updated on 2021-04-30 Manufactured by Air lift - Part Number AIR:88272, 1999-06 Silverado/Sierra 1500 4wd AirLift Load Lifter Ultimate 5000 Series, All the benefits of the LoadLifter 5000 series with the addition of an internal bumpstop in the bags so you can safely operate with no air pressure., LoadLifter5000 Air Spring Kit by Air Lifts are specifically engineered for hauling or towing heavy loads. LoadLifter 5000 air springs are designed to fit popular vehicles and pickup trucks, motor homes, commercial trucks and other severe uses. Internal jounce bumper prevents damage when driving with an empty air bag Exclusive Air Lift air spring kit Up to 5,000 lbs. of load-leveling capacity Next-Level Air Springs. All the goodies of the LoadLifter 5000 air spring kit with an internal jounce bumper inside - giving you the ultimate in lift, ride comfort, and safety. Internal Jounce Bumper One More Layer of Awesome. Our internal jounce bumper helps to absorb shock, even with zero air pressure. What more could you ask for? Eliminates harsh jarring on rough roads Maintenance-free! Safely run with zero air pressure Replaces factory jounce bumper Provides three-stage ride comfort Up To 5,000 LBS. Of Load Leveling Greatness. Our air springs beef up your existing suspension to boost your safety and comfort when hauling massive loads.