2005-2010 Superduty Rear Loadlifter 5000 Ultimate Air Spring Kit (ALF88398)LoadLifter 5000 Ultimate adjustable air spring kits feature all of the benefits of Air Lift's heaviest rated air spring with the addition of an internal jounce bumper inside the spring for the ultimate in ride comfort. Designed to work with your vehicle's factory leaf springs, this system provides up to 5,000 lbs. of rear load leveling capacity to keep the vehicle stable, level, and comfortable whether loaded or unloaded. The internal closed cell