Repair or upgrade the transmission cooling in your 1999-2003 Ford 7.3L Powerstroke with Direct-Fit Transmission Coolers & Lines. Performance transmission cooler thermal bypass valves are available for some applications that will replace the problematic factory thermal bypass valve. 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. There are many high-quality manufacturers accessible, including Dorman, BD-Power, Mishimoto, and others.