Next Gen Diesel offers Duramax transmissions, parts, and rebuild kits for all your diesel truck needs. These transmissions and parts are applicable to popular diesel Chevy trucks built between 2001-2019. Allison transmissions offer torque and power like you’ve never seen before. If you want to give your American-made truck an extra boost, opt for our competition model products. The competition model is compatible with 1,500 HP engines. If you need fix up or upgrade your diesel Chevy truck, we have rebuild kits that include everything you need. If your tuck has a busted part or you just want to upgrade a single component, choose the applicable part from our wide selection of Allison transmission parts. Browse our selection of Duramax transmissions, parts, and rebuild kits now.