2017-2019 Silverado & Sierra 2500 & 3500 Duramax L5P Transmission Coolers

Heat is the number one enemy of your Allison 1000, and the 2011-2016 LML Duramax trucks have a known restriction in the factory thermal valve that limits fluid flow to the cooler. Tier One's transmission cooling upgrades for 2011-2016 Silverado & Sierra 2500 & 3500 trucks solve this issue. We offer high-efficiency transmission coolers with larger surface areas, as well as thermal bypass valve upgrades that ensure full fluid flow to the cooler at all times. Keeping your fluid temps down extends the life of your clutches, seals, and torque converter, especially when towing heavy grades. If your truck has already suffered from heat damage and is slipping in gear, a cooler alone won't fix the internal clutches, so you may need to look at replacing the unit with one of our 2011-2016 Duramax LML Complete Transmissions. An unlocking torque converter creates significant friction and heat, so to reduce heat generation at the source while improving towing performance, consider upgrading to one of our 2011-2016 Duramax LML Torque Converters. Sometimes overheating is caused by inefficient fluid routing or stuck valves, but you can improve fluid flow and reduce operating temperatures by installing one of our 2011-2016 Duramax LML Valve Bodies. Another great way to help manage heat is by increasing your overall fluid volume, so add several quarts of extra capacity and help dissipate heat by adding a deep pan from our section of 2011-2016 Duramax LML Transmission Parts.