Kit includes  RAS Heavy Duty Spring for each rear leaf spring. RoadActive Suspension kits are designed to strengthen the rear leaf springs for towing or hauling without negatively affecting unloaded ride quality. This kit will reduce rear bounce and squat when loaded while significantly improving stability, handling and performance at all times. Some Dodge 2500/3500 may require disassembly of rear shackle -- please see fitting instructions inside box. Estimated install time is 1-3 hours. 

*Contact us if truck has factory top overload spring