Swap out your GM's worn-out rear shocks with our selection of high performing 3-4" Rear Shocks! Overtime your existing shocks wear down which leads to a harsh ride, vibrations and excessive body roll. Our shocks feature durable construction and precision design, our rear shock selection is built to last and deliver excellent dampening performance. Whether your towing, hauling a heavy load or just want the best performance, our rear shocks deliver enhanced control and stability to your rear end. Pair your new set of rear shocks with our selection of 3-4" Front Shocks. GMDuramax Fitments: 2011, 2012, 2013, 2014, 2015, 2016 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.