GMC 1500 Sierra 1973 - 1989 Mark Lt *If your truck does have

*If your truck does have a factory top overload

This RoadActive Suspension kit includes an RAS Standard Duty Spring for each rear leaf spring

This RoadActive Suspension kit includes an easy to install RAS Standard Duty Spring for each rear leaf spring

*Contact us if truck has factory top overload spring

RoadActive Suspension HD strengthens your factory leaf spring suspension to improve stability

GMC 1500 Sierra 1973 - 1989 Mark Lt *If your truck does haveKit includes an easy to install RAS Standard 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. Estimated install time is 1 hour.