Those of you lucky enough to own a 1999-2004 Super Duty or Excursion have a very desireable truck with an undesired leaf spring ride. The Kelderman 9-10″ Lift Kit has everything you need to say goodbye to a rough set of leaf springs and hello to the comfortable ride and adjustability of air suspension. Whether your truck is stock or already lifted, the Kelderman 9-10″ 4-Link Rear Air Suspension lift kit is the highest quality option on the market to upgrade your suspension. Our lift kit design eliminates the leaf spring suspension from the rear of your truck. We place an industrial strength air bag directly between the axle and the frame of the the truck. Adjustable trailing arms and an adjustable panhard bar keep the rear end centered and the airbags provide an increased towing/payload capacity with an unbeatable ride quality. This kit also includes a larger rear sway bar to help eliminate sway experienced with lifted trucks or when towing heavy loads. This 9-10″ 4-Link Air Suspension Lift Kit also provides unmatched versatility. With optional air control packages, the kits can move above or below the designed 9-10″ ‘ride height’. The suspension can be completely deflated to a 5″ lift or up to a 14″ lift when completely inflated. Adding our 9-10″ 4-Link Front Air Suspension LIft Kit and an air control system allows you to drop your truck down to a 5″ lift to make it easier to enter or exit the vehicle. It is also handy for hooking up to trailers or loading things in the bed. Shock and air management packages are sold separately to allow to configure your air suspension exactly the way you want it. Rear only kits typically use a mechanical, self-leveling air control option such as our SLKD2WD Air Control System. This allows the rear suspension to adjust to the weight of any passengers, cargo or trailers so you won’t have any squat when loaded. Adding a 9-10″ 4-Link Front Air Suspension Lift Kit and an electronic air control system will allow you to raise or lower the truck at all four corners!