Our traction bars enable improved rear axle stability, prevent driveline wear, and eliminates potential spring wrap. Traction bars also improve stability when towing or hauling heavy loads. By reinforcing the rear axle and preventing failure, these traction bars help you tackle the road smoothly and without the annoyance of wheel hop. Check out our selection of Towing Upgrades for even greater durability and stability! 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.