The ICON Vehicle Dynamics 4.5 Dual Rate Spring System for ('14) Ram 2500 ('13) 3500 4WD offers you both incredible ride quality and performance. This 4.5 dual rate spring system offers an initial soft ride zone with an aggressive 2nd rate to help prevent bottoming out. These ICON springs have a dual stage powder coat process to help prevent corrosion and are shot peened and pre - set to prevent sagging. All ICON shocks are engineered and tuned to work hand in hand with these springs for the best available on and off - road performance.