The 2001-2010 GM 2500HD/3500 requires significant shock damping to comply with the massive spring rate of the factory torsion bar system. ICON Vehicle Dynamics has developed a range of suspension systems with optimized vehicle specific shock damping. These systems offer excellent on and off-road drivability. While driving the construction site or trails to your favorite dirt bike location, ICON wants you to get there in comfort just like your drive to work. ICON's Stage 1 system is comprised of V.S. 2.0 Aluminum Series IFP front shocks and 2.0 Aluminum Series IFP rear shocks. The ICON vehicle specific tuned shocks are the key to attaining optimum ride quality and getting that desired comfort with the & 1-ton working capability.