2011-2015 GM 2500/3500 +2″ 4X4 4-Link Rear Air Suspension

Description 2″ 4-Link Rear Air Suspension: (Part # KLM20790) Eliminate the leaf springs from your Silverado or Sierra 2500/3500 to improve your towing capacity and improve your ride quality. This 2″ 4-Link Rear Air Suspension matches up perfectly with a 4″ Front Lift Kit, so you can give your truck a more aggressive look without sacrificing your truck's capability. This 4-Link Rear Air Suspension includes trailing arm mounts, adjustable trailing arms, upper and lower airbag mounting brackets, industrial-strength air bags, adjustable panhard bar, panhard bar mount, an upgraded rear sway bar assembly, and all necessary hardware for installation. Shock and air control systems are sold separately. Optional Air Control Systems : The base version of this air suspension system will be in a 'manual fill' package. This provides you with the necessary amount of air line, fittings, and Schrader valves to inflate and deflate the suspension like you would a tire. Several air control systems are available, so let's go through some popular options. Mechanical, Self-Leveling Air Control System (Part # SLKD2WD) This is the most common air control system for any and all of our full air suspension products. It includes a 100% duty cycle VIAIR air compressor, a 3-gallon air tank, two mechanical height control valves, height control valve linkages, (2) dump valves, an air dryer, plus all wiring, fittings, and connections for installation. The air compressor is contained within a weather-resistant enclosure to protect the vital elements of the control system. An in-cab control panel is provided, allowing you to control the ON/OFF power to the air compressor and a dump switch to activate the rear dump valve option. You can also use your factory auxiliary/upfitter switch panel for these two switches in place of the Kelderman control panel. This configuration allows the suspension to automatically adjust the pressure within the airbags to maintain the designed 'ride height' of the suspension. As soon as you hook up to a trailer, the mechanical height control valves move with the suspension's adjustment and pull air from the onboard air tank to inflate back to the 'ride height' position. It will also manually bleed off air pressure when you're unloading weight, unhooking a trailer, etc. The dump valves are designed for use with the rear air suspension and allow you to flip a switch, deflate the rear suspension down approximately 4″, and pull right out from under your trailer. The onboard air dryer removes moisture from the system periodically to prevent damage to components and remain operational in cold temperatures and climates Take your truck's ride height, towing, and comfort up a notch with the Kelderman 2″ 4-Link Rear Air Suspension Lift Kit. NOTE: The installation of this kit with the optional Mechanical, Self-Leveling Air Control System may require the removal of the factory spare tire.