Find the Direct-Fit Transmission Coolers & Lines you need to keep the transmission cool in your 2007.5-2018 Dodge Ram 6.7L Diesel. Get OEM replacement cooler lines or performance braided hoses with billet -AN fittings for your vehicle. The increase in fluid capacity and core volume will offer enhanced cooling efficiency with an aftermarket transmission cooler. Replace the problematic factory thermal bypass valve (if equipped) with a performance transmission cooler thermal bypass valve. Industry-leading brands such BD-Power, Mishimoto, Dorman, and more are offered.