2003-2009 GM 4500/5500 Cab & Chassis 2-Stage Rear Air Suspension


Adding a Kelderman Air Suspension System to your existing suspension will provide a level of comfort you thought was impossible. This is particularly true when the truck is not loaded. By loosening the rear spring shackle from the frame and attaching it to the air suspension, you've effectively provided yourself with a two-stage suspension system that makes your truck ride better!

 The Kelderman 2-Stage Air Suspension is not to be confused with just adding an air bag between the axle and the frame. This type of system is merely a helper for the springs to allow additional weight carrying capacity. It does nothing for the riding qualities of the vehicle and in many situations degrades the ride. You do not get additional load carrying capacity with the Kelderman 2-Stage Air Suspension, nor do you sacrifice capacity. The only thing you gain is ride comfort, and isn't that exactly what you're after? 

Want to know how it works?

An upper frame is bolted to the pickup frame. A lower frame is attached to the upper frame at the rear hinge point. The spring shackles are attached to the lower frame and the air bags are mounted between the upper and lower frame units. It's really that simple to convert your truck to air ride comfort. 

Typical air pressure when empty ranges from 25-35 psi and may vary depending on what kind of bed you have and the cargo being hauled. When loaded, depending on the load, pressure could reach 100psi. The Firestone air bags are durable and are tested to peak at over 300psi without breaking! 

The amount of air pressure to keep in the system can be determined by the bottom swing arm of the air suspension. Keeping this swing arm parallel with the ground will allow your air suspension to work as designed, to give you the best ride.

NOTE: We make these kits for all sorts of hitch and tank configurations on the 4500/5500 chassis. If you are wondering if it will fit, give us a call at 1.800.334.6150 or email us at info@kelderman.com and we can help you figure it out!


  • All components are constructed of high quality materials for reliability and a long service life.
  • The two stage system utilizes two air bags, one on each side of the frame.
  • New, upgraded hitch receiver as optional equipment.