This kit is designed to increase the carrying capactiy of the 2003-2004 Dodge 2500-3500 4x4 trucks. By replacing the leaf springs with the Keldeman 4 link, you will keep the truck height the same, whether there is 50 pounds in the bed or 5,000 pounds. The kit comes with either automatic height control valves or incab controls. An optional dump valve is available. This kit improves the ride of the truck when loaded, and is very comparable to the stock ride when empty.