2017-2019 Silverado & Sierra 2500 & 3500 Duramax L5P Complete Transmissions

Your 2011-2016 LML Duramax is capable of making massive power with just a simple tune, but the stock Allison 1000 transmission struggles to hold anything over 500 horsepower for long. The stock clutches simply can't handle the torque, leading to limp mode and burnt friction plates. Tier One's built transmissions for 2011-2016 Duramax LML trucks are engineered to solve this problem. We replace the weak points with high-performance clutches, billet shafts, and hydraulic upgrades that allow our transmissions to hold massive horsepower and torque. Whether you need a reliable towing transmission or a competition-ready build capable of holding 1000+ horsepower, Tier One has the Allison 1000 solution you need. 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 2011-2016 Duramax LML Torque Converters. Protect your investment from heat while towing by adding one of our 2011-2016 Duramax LML 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 2011-2016 Duramax LML 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 2011-2016 Duramax LML Transmission Parts.