Get the Direct-Fit Transmission Coolers & Lines that will upgrade and fix the transmission cooling in your 2008-2010 Ford 6.4L Powerstroke. Replace the problematic factory thermal bypass valve (if equipped) with a performance transmission cooler thermal bypass valve. Get performance braided hoses with billet -AN fittings or factory replacement cooler lines for your vehicle. The increase in fluid capacity and core volume will offer enhanced cooling efficiency with an aftermarket transmission cooler. Mishimoto, Dorman, BD-Power, and more top-notch manufacturers are available.