Fits:  1973-2016 Ford F-250 F-350 Without Overload 1973-2016 Ford F-150 4WD until 2009 1999-2005 Ford Excursion 2011-2016 Chevrolet Silverado GMC Sierra 2500 3500 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 strengthen the rear leaf springs. This kit will significantly improve stability, performance and handling while reducing bounce and rear squat when loaded. Load Carrying Roadmaster Active Suspension improves and simplifies load carrying, preventing the vehicle rear from sagging under the weight of additional load. Eliminates Axle Wrap Roadmaster Active Suspension effectively reduces axle wrap and wheel hop by absorbing the added force of increased torque. Improve Road Handling Roadmaster Active Suspension reduces body roll by supporting the leaf spring that is taking the increased load.