Upgrade your GM’s worn-out rear shocks with our high-performance 3-4" rear shocks! Over time, factory shocks degrade, leading to a harsh ride, vibrations, and excessive body roll. Built with durable construction and precision engineering, our rear shocks are designed to last and provide excellent damping performance. Whether you're towing, hauling heavy loads, or simply seeking the best ride quality, our rear shocks deliver improved control and stability for your rear suspension. Pair your new set of rear shocks with our selection of 3-4" Front Shocks.GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax.Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali.Some exceptions apply, please see individual product pages for specific fitments.