Maintaining optimal transmission temperatures is crucial for vehicle durability and performance, especially in demanding applications like towing, heavy-duty fleet work, or high-performance driving. The Mishimoto 03-05 Chevrolet and GMC 6.6L Duramax transmission cooler is engineered to provide exceptional cooling capacity with a durable, stacked-plate design that ensures maximum heat dissipation and long-lasting operation. Its larger core volume and increased fin surface area—174% and 192% respectively—outperform stock cores significantly, helping to prevent overheating under heavy loads or intense driving conditions. This cooler is built with quality materials and features CNC-machined adapters that connect directly to the factory transmission lines, offering a leak-free and secure fit. Designed specifically for models with Allison transmissions (LB7/LLY), it ensures a seamless installation with direct-fit brackets and custom hoses for a trouble-free upgrade. As with all Mishimoto products, this transmission cooler is backed by a lifetime warranty with accident protection, providing peace of mind for as long as you own your vehicle. Whether you are a daily driver, a towing enthusiast, or a professional fleet operator, this cooler helps maintain transmission temperature, extend component life, and optimize overall vehicle performance. The use of high-quality stacked-plate construction and precision engineering makes this cooler a reliable choice for enhancing your Duramax diesel's cooling system and ensuring your transmission stays cool under pressure.
Features:
- CNC-machined adapters: Enable easy, leak-free connection to stock or AN lines
- Direct-fit for all 2003-2005 Chevrolet and GMC with Allison transmissions (LB7/LLY)
- Stacked-plate construction: Offers maximum durability and superior cooling performance
Fitment:
2003 Chevrolet Silverado 2500 HD Base
2003 Chevrolet Silverado 2500 HD LS
2003 Chevrolet Silverado 2500 HD LT
2003 Chevrolet Silverado 2500 HD WT
2003 Chevrolet Silverado 3500 Base
2003 Chevrolet Silverado 3500 LS
2003 Chevrolet Silverado 3500 LT
2003 GMC Sierra 2500 HD Base
2003 GMC Sierra 2500 HD SLE
2003 GMC Sierra 2500 HD SLT
2003 GMC Sierra 2500 HD WT
2003 GMC Sierra 3500 Base
2003 GMC Sierra 3500 SLE
2003 GMC Sierra 3500 SLT
2004 Chevrolet Silverado 2500 HD Base
2004 Chevrolet Silverado 2500 HD LS
2004 Chevrolet Silverado 2500 HD LT
2004 Chevrolet Silverado 2500 HD WT
2004 Chevrolet Silverado 3500 Base
2004 Chevrolet Silverado 3500 LS
2004 Chevrolet Silverado 3500 LT
2004 Chevrolet Silverado 3500 WT
2004 GMC Sierra 2500 HD Base
2004 GMC Sierra 2500 HD SLE
2004 GMC Sierra 2500 HD SLT
2004 GMC Sierra 2500 HD WT
2004 GMC Sierra 3500 Base
2004 GMC Sierra 3500 SLE
2004 GMC Sierra 3500 SLT
2004 GMC Sierra 3500 WT
2005 Chevrolet Silverado 2500 HD Base
2005 Chevrolet Silverado 2500 HD LS
2005 Chevrolet Silverado 2500 HD LT
2005 Chevrolet Silverado 2500 HD WT
2005 Chevrolet Silverado 3500 Base
2005 Chevrolet Silverado 3500 LS
2005 Chevrolet Silverado 3500 LT
2005 GMC Sierra 2500 HD Base
2005 GMC Sierra 2500 HD SLE
2005 GMC Sierra 2500 HD SLT
2005 GMC Sierra 2500 HD WT
2005 GMC Sierra 3500 Base
2005 GMC Sierra 3500 SLE
2005 GMC Sierra 3500 SLT
2005 GMC Sierra 3500 WT
