2006-2007 Silverado & Sierra 2500 & 3500 Duramax LBZ Complete Transmissions

The Duramax LBZ under the hood of your 2006-2007 Silverado or Sierra HD is famous for making huge power with just a simple tune, but the factory transmission often can't handle that extra torque. It's common for stock Allisons to slip or go into limp mode when pushed by a modified LBZ. Tier One's built transmissions for 2006-2007 Duramax LBZ trucks are designed from the ground up to handle this extreme power. We replace weak factory components with high-performance clutches, billet shafts, and hydraulic upgrades. We have everything from budget-friendly HD Tow transmissions perfect for heavy hauling to all-out competition transmissions that will let you launch hard at the track and crush your opponents. Even the best transmission build needs a reliable connection to the engine, so if you are piecing together your own build or need a specific stall speed, look at our 2006-2007 Duramax LBZ Torque Converters. Protect your investment from heat while towing by adding one of our 2006-2007 Duramax LBZ Transmission Coolers. If you aren't ready for a complete transmission swap but want to fix shifting issues, a valve body replacement is a great place to start, so check out our 2006-2007 Duramax LBZ Valve Bodies. To get the most out of your new transmission, consider upgrading your fluid capacity or installing a thermal bypass valve from our section of 2006-2007 Duramax LBZ Transmission Parts.