2017-2022 Ford F450-550 Chassis Cab 4-Link Rear Air Suspension – 2.5″ Lowering Kit

4-Link Rear Air Suspension:

(Part # KLM69650, Gas-Engine or Inboard DEF Tank)

(Part # KLM69651, Outboard DEF Tank)

Searching for a top-of-the-line suspension upgrade for your 17-22 F-450/F-550 Chassis Cab? Look no further than the Kelderman 4-Link Rear Air Suspension. Designed to deliver the ultimate results in performance, ride comfort, and durability, the 4-Link Rear Air Suspension is the perfect solution for those who demand the very best from their vehicle. This air suspension system is designed to provide a smoother, more comfortable ride while improving your vehicle’s handling, stability, and payload capacity.

The Kelderman 4-Link Rear Air Suspension features a four-link design that provides maximum control and stability under heavy loads. Industrial-strength airbags are used to absorb road shock and vibration to ensure a smooth, comfortable ride even on rough terrain. With this suspension installed, you will be able to haul heavy loads with ease and without sacrificing ride quality or handling.

Optional Air Control Systems:

The base version of these systems 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 + HCVLK’s):

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.

Mechanical, Self-Leveling Air Control System – Dual Compressor & Tank (Part # 30664 + HCVLK’s):

Want more air for your air suspension? This air control system is identical to the system referenced above, but with an additional air compressor and air tank. We tend to see this more with serious work truck applications, fleet use, trucks running at MAX GVWR, or those that plan to regularly raise & lower the rear air suspension. The additional air compressor and tank provide a quicker recovery time and make sure plenty of air is available for raising & lowering the suspension and any necessary ride height adjustments.

If you’re looking for a high-performance, reliable suspension upgrade for your F-450/F-550 Chassis Cab, then the 4-Link Rear Air Suspension System from Kelderman is the easy choice. A stock height version of this kit is also available, and it can be viewed here.