ICON 14-18 Ram 2500 4WD 4.5in Stage 4 Suspension SystemThis system includes multi rate rear coil springs for a more compliant ride. The lighter initial rate of these performance rear coil springs helps the truck feel smoother and more controlled over washboard roads, small whoops, or similar terrain. The secondary rate allows the truck to maintain exceptional ride quality over larger obstacles, while at the same time retaining factory payload capacity (at a reduced ride height). These performance systems