XDP has a large assortment of stock replacement and upgraded parts for the Allison Transmission in your 2020-2023 GM Silverado/Sierra 2500HD/3500HD. Automatic transmission shafts with hardened input, output, and intermediate shafts are a significant upgrade over your factory transmission. Torque Converters from DPC, Sun Coast Converters, and ATS can manage competition-level horsepower and torque. Upgraded Flex Plates will handle more power and enable better power transfer from the Torque Converter. Automatic Transmission Pans from XDP, Mag-Hytec, and PPE keep the transmission fluid cold, extending the life of the fluid. Enhance the shifting of your transmission with a Valve Body from Revmax, BD-Power, or ATS.
In older diesel trucks it is common for them to have a manual style transmission which requires the driver to do all the gear selections on their own. Valair or South Bend Clutch Manual Transmission Clutches are available with single, dual, or triple clutch plates to handle any power level. Find the best Transmission Fluid brands for your Automatic or Manual Transmission, including Royal Purple, Lucas Oil, and Champion. Find the parts you need to keep your transmission on the road with the products available at XDP.