Mishimoto 03-05 Chevrolet / GMC 6.6L Duramax (LB7/LLY) Transmission Cooler

If you're driving a 2003-2005 Chevrolet or GMC truck with the 6.6L Duramax engine, especially if you use it for towing, hauling heavy loads, or even just enjoy spirited driving, keeping your transmission cool is crucial. Overheating can lead to premature wear and costly repairs. Mishimoto has developed a direct-fit transmission cooler specifically for these trucks to combat excessive heat.

This Mishimoto transmission cooler features a robust stacked-plate construction, which is known for its durability and effective heat dissipation. It's significantly larger than the factory cooler, boasting a 174-percent increase in core volume and a 192-percent increase in fin surface area. This means it can handle more heat and keep your transmission fluid at optimal temperatures, even under demanding conditions. The kit includes CNC-machined adapters that connect directly to your stock transmission cooler lines, ensuring a leak-free installation. Direct-fit brackets and custom-fit hoses are also included, making the installation process straightforward.

This cooler is designed to work with the Allison transmission found in the LB7 and LLY Duramax engines. Mishimoto backs this transmission cooler with their Lifetime Warranty, which includes accident protection, giving you peace of mind for as long as you own your truck.