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Designed for 2015+ Ford F-450 pickup trucks with an upgraded square rear axle, this full air suspension lift kit removes your rear leaf springs and upgrades your suspension to a comfortable air suspension ride quality and boosts your towing capabilities. Our 4-6″ 4-Link Air Suspension Lift Kit provides all the components needed to remove your leaf springs such as trailing arm mounts, adjustable trailing arms, upper and lower air bag mounting plates, lower axle clamps, adjustable panhard bar, rear crossmember, carrier bearing drop, accumulator tanks, and larger sway bar end links. This kit upgrades your suspension while providing you with 4-6″ of lift. This kit is adjustable anywhere between the designed 4-6″ ‘ride height’. Want to run 35″ tires on your truck? Set the bags on the lower end of the ‘ride height’. Want to upgrade to 37″ tires? Just bump up the bags and adjust the framework/steering alignment accordingly to have the clearance you need. Add this kit to the rear of your F-450 by itself to improve the ride and towing of your truck or add our 4-6″ front kit to it to have a full air suspension on your truck! The 4-6″ lift kit is capable of lowering down to approximately a 1″ lift to make it easy to climb in and out of the truck, hook up to trailers, or just to show off what your truck can do! When fully inflated to 4-6″ kit becomes a towering 10″ lift! This can all be accomplished with the help of our optional air control systems! Make your Super Duty the ultimate work truck with an unbelievable ride quality and be the envy of the all truck owners by getting your full 4-6″ Air Suspension kit from Kelderman Air Suspension today! Add one of our optional self-leveling air control packages to let the suspension automatically adjust to weight, Simply hook up to your trailer and the system will add air to the bags, as needed, to maintain the proper 4-6″ ‘ride height’ for your truck.