Check the listing for details. RoadACTIVE 3611-SHD Active Suspension Leaf Spring Converter for Ford Super Duty. Condition: New. Listed at 589.00 USD. Product DetailsRear Passive to Active Suspension Conversion Kit (3611-LHD) by Roadmaster®. Roadmaster Active Suspension is the only rear leaf spring suspension upgrade that converts basic passive leaf spring suspension to mechanical active suspension. Roadmaster system absorbs and dissipates load force energy, resulting in significantly reduced or eliminated rear squat caused by heavy loads. It improves vehicle stability, balance, traction and control, all with (or without) a load. Roadmaster Active Suspension adds critical strength to leaf springs, but will not compromise ride quality. Kit includes an easy to install Active Suspension for each rear leafspring. Without having to interfere with u bolts, installation will take approximately 1 hour. Roadmaster Active Suspension kits are designed to eliminate shock on the suspension itself, thus extending the life of the leafs springs, shock absorbers, shackles, and even tires.Fitment- 2011-2019 F250 F350Notes: Ultra Heavy Duty Kits Designed For 3/4 And One Ton Trucks.Features:Eliminate Axle WrapSimplify Load CarryingImprove RoadhandlingPeerless quality at a great priceMade with unmatched practicality, dependability and functionality in mindFor enhanced handling and ride qualityAll You Need to Know About Roadmaster Active Suspension Roadmaster Active Suspension is the most unique product on the market. This product is a one of a kind suspension upgrade which provides many additional advantages that no other product can offer.