Next Gen Diesel carries a variety of 2001-2005 Duramax Allison transmission rebuild kits designed for those who enjoy fixing up their Chevy or GMC diesel trucks. The rebuild kits contain everything you’ll need to properly fix your transmission. In the kit, you’ll find input and output shafts, clutches, flexplates, deep-pan, reaction plates, valve body, PTO covers, and more. Each of the components in the rebuild kit comes from high-quality materials, ensuring the longevity of your transmission after your repair. Our selection of 2001-05 Duramax Allison transmission rebuild kits includes options for the competition, street, SuperStock, and ultimate overhaul. These kits correspond with our selection of 01-05 Allison transmissions. Check out our options today!