2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Rebuild Kits & Internal Parts

We offer a comprehensive selection of rebuild kits and internal components for your GM 2500HD/3500HD's transmission to make the job seamless. Whether you're looking to boost durability with a high-strength billet input shaft, upgrade to a high-performance overdrive clutch drum for handling extreme power, or refresh your transmission with new gaskets, bearings, and clutches, we've got everything you need! Give your transmission the upgrades and heavy-duty internal parts it needs to continue to perform flawlessly on your GM 2500HD/3500HD! Pair your new rebuild kits and internal parts with our selection of Engine Upgrades!  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.