Zone Offroad 2013-17 Ram 3500 4.5" Radius Arm Suspension Lift System. The new Ram 3500 gives new meaning to "Heavy-Duty". Holding true to that we have developed a lift system centered around two new massive radius arms to replacement the factory arms. The new arms are fully boxed, internally gusseted and designed to bolt in the factory location while adjusting the suspension geometry for 4.5" to 6.5" of lift.The arms utilize extra large, greaseable bushings at the frame and are designed to use the factory alignment cams at the axle. They are formed for maximum tire clearance. Lastly, they just flat-out look cool and are a nice upgrade from the standard radius arm drop systems.In addition to the new radius arms, like our other new Ram kits, this system gets progressive rate front coils, track bar relocation and steering correction. Out back there is a lift block and u-bolts to level everything out. Vehicles equipped with 2 piece rear driveshafts may required the carrier bearing to be lowered.