Get the Direct-Fit Transmission Coolers & Lines that will upgrade and fix the transmission cooling in your 2003-2007 Ford 6.0L Powerstroke. There are performance thermal bypass valves for some transmission coolers that can take the place of the troublesome factory thermal bypass valve. The cooler lines are available in factory replacement or performance durable braided hoses with billet -AN fittings. Get increased cooling efficiency with an aftermarket transmission cooler that has a greater fluid capacity and core volume. Mishimoto, Dorman, BD-Power, and more top-notch manufacturers are available.