Unchained 3.5 System Base 6 Lift 2012-13 RAM 2500/3500 Diesel Carli SuspensionThe 6 inch Unchanied Kit pulls out all the stops. This system provides uncompromised offroad ability with a civil on road ride resulting in a truck that's a blast to drive in all environments. Features and Benefits: Featuring Huge remote reservoir 3. 5 inch front shocks and 3. 0 4 tube bypass rear shocks, this system is ready to soak up high speed hits The fabricated radius arm system included allows for huge improvements in articulation over factory