2004.5-2005 Silverado & Sierra 2500 & 3500 Duramax LLY Transmission Coolers

Your Duramax LLY generates a lot of heat, especially if you've turned up the power with serious performance mods, and your aging stock transmission cooler may not be able to keep up. Tier One's transmission coolers for 2004.5-2005 Silverado & Sierra 2500 & 3500 Duramax LLY trucks can keep your truck's transmission temperatures under control, even at extreme power levels or during heavy towing applications. Each of these Duramax LLY transmission coolers features larger surface areas and more efficient designs than stock to dissipate heat effectively. We carry both drop-in replacement coolers and auxiliary units to prevent your truck from going into limp mode. 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 2004.5-2005 Duramax LLY 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 2004.5-2005 Duramax LLY Torque Converters. Sometimes overheating is caused by the factory thermal bypass valve restricting flow, but you can fix this restriction by installing a new bypass valve from our section of 2004.5-2005 Duramax LLY Transmission Parts. 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 2004.5-2005 Duramax LLY Transmission Parts.