2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Transmission Coolers, Lines & Accessories

Your GM 6.6L transmission must maintain optimal temperatures to perform at its best during towing, off-roading, and daily driving. High-performance activities can generate excess heat, putting strain on your transmission and leading to premature wear. To enhance performance and ensure long-term reliability, our range of transmission coolers and thermal bypasses provides the perfect solution. Whether you choose upgraded coolers for better cooling efficiency or thermal bypasses to regulate fluid temperatures, we have everything you need to keep your transmission operating smoothly and reliably. Check out our selection of Transmission pans, filters, fluid for additional cooling performance! GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.