Replace the cracked or damaged Flex Plate in your 2008-2010 Ford 6.4L Powerstroke. A flex plate connects the crankshaft to the torque converter. Flex plates are used on vehicles with an automatic transmission, as opposed to a flywheel that found in a manual transmission setup. Flex plates are generally much lighter and thinner than flywheels. A flex plate consists of two parts, the flex-plate and the ring gear. Cracks or failures can occur in a flex plate from an out of balance engine or torque converter as well as from bolts that were not properly torqued or in the correct sequence. The teeth on the ring gear can also wear or break off due to a bad starter, failure to use starter shims (where required), or engaging the starter while the engine is running. Noises while starting the engine can also be an indication of either a starter failure or broken teeth on your flex plate. Over time flex plates can become cracked causing it to vibrate. Symptoms of a cracked flex plate can include clunking sounds or a grinding noise while the engine is running. Steel stock-style replacements are available or upgraded billet versions that are SFI 29.1 certified for competition use. Shop all the top manufacturers such as ATS Diesel, BD-Powers, Diesel Site, DPC, Hays, Revmax, Sun Coast Converters, Valair, and more!