Shocks contribute greatly to your trucks ride quality, which is why your old existing shocks can lead to a harsh ride, vibrations, and excessive body roll. Upgrading to our selection of 5-6" shocks provides your truck with excellent control, Our selection of shocks is constructed with precision and durability, ensuring they last while providing excellent dampening performance. Whether you're towing, hauling a heavy load, off-roading, or simply seeking optimal performance, our rear shocks offer enhanced control and stability for your lifted rear end. Pair your new set of rear shocks with our selection of 5-6" Front Shocks.GM Duramax Fitments: 2001, 2002, 2003, 2004 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.