2001-2004 Duramax LB7 2500 & 3500 Parts & Accessories

Your classic LB7 Duramax truck may be no spring chicken, but these awesome diesels have more than a few tricks up their sleeves that can be unlocked with the right drivetrain parts from Tier One. We have all the transmission upgrades for 2001-2004 Duramax LB7 trucks that you need to add reliability and holding power to your Silverado or Sierra HD build. We here at Tier One have everything from our very own built Allison 1000 transmissions and rebuild kits that can hold a ton more power than stock, to essential durability upgrades like high-performance torque converters, thermal bypass valves, and deep transmission pans. Whether you are restoring an old work truck or building a drag racer, Tier One has the parts to keep your LB7 moving. Check out our built Allison transmissions. If you don't see something you need, contact Tier One or call 602-399-5484! If your factory transmission is slipping or you are pushing serious horsepower, a stock replacement just won't cut it, so take a look at our 2001-2004 Duramax LB7 Complete Transmissions. The factory torque converter is often the first weak point to fail when you start adding torque, so get better lock-up performance with one of our 2001-2004 Duramax LB7 Torque Converters. The Allison 1000 runs hot due to the factory thermal valve, so keep your fluid temps in check with our 2001-2004 Duramax LB7 Transmission Coolers. Sloppy shifts or pressure issues can be fixed with our updated 2001-2004 Duramax LB7 Valve Bodies. Finally, whether you need a deep transmission pan for extra fluid capacity or rebuild components, we have the parts you need in our section of 2001-2004 Duramax LB7 Transmission Parts.