14-Up RAM 2500 4WD 2.5 Inch Suspension System (Air Ride) ICON Vehicle DynamicsICON's 2014 UP Ram 2500 4WD 2. 5 Inch Stage 4 Suspension System is made up of dual rate front coil springs, necessary bracketry and hardware, front and rear adjustable track bars, as well as 2. 5 Aluminum Series reservoir front and rear shocks with CDCV. This system improves ride quality and performance both on and off road. The ICON stage 4 system is great for towing, rough construction site terrains, and country dirt roads all while keeping a smooth