2017-2019 GM 2500HD/3500HD 6.6L L5P Duramax Transmission Coolers, Lines & Accessories

Keeping the transmission cool in your 2017-2019 GM 6.6L Duramax L5P is crucial when pushing things to the limit, so pick up some aftermarket transmission coolers, lines, and accessories to ensure consistent and reliable performance each time you're behind the wheel. These GM 2500HD/3500HD Transmission Accessories are designed to enhance cooling efficiency, reduce transmission wear, and extend the life of your truck's transmission, ensuring you can handle any challenge without overheating. Pair these upgrades with a performance-oriented Transmission Pan for even better temperature control and overall transmission longevity.  GM Duramax Fitments: 2017, 2018, 2019 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.