Find the Direct-Fit Transmission Coolers & Lines you need to keep the transmission cool in your 2019-2023 Ram 6.7L Diesel. The increase in fluid capacity and core volume will offer enhanced cooling efficiency with an aftermarket transmission cooler. Performance transmission cooler thermal bypass valves are available for some applications that will replace the problematic factory thermal bypass valve. Get performance braided hoses with billet -AN fittings or factory replacement cooler lines for your vehicle. Mishimoto, Dorman, BD-Power, and more top-notch manufacturers are available.