Upgrade the flex plate in your 2003-2004 Dodge 5.9L Diesel. The flex plate is a metal disc used to connect the engine to the torque converter. They are used on vehicles with an automatic transmission, as opposed to a flywheel that is normally used with a manual transmission. Flex plates are typically lighter and thinner than flywheels. A flex plate consists of two parts, the flex-plate and ring gear. A flex plate can crack or fail due to an out of balance engine/torque converter or from bolts that were not torqued to the proper specifications or in the proper sequence. The ring gear teeth can also wear rapidly or break off due to a bad starter, failure to use starter shims (where required), or engaging the starter when the engine is running. An engine that makes noise when starting can also be an indication of either a starter failure or broken teeth on your flex plate. Eventually cracking or breakage can occur causing it to wobble. Signs of a failed flex plate can include a clunking or grinding sound with the engine running. Flex plates are available in OE-style steel replacements or upgraded billet versions that are SFI 29.1 certified. Shop all the leading manufacturers such as ATS Diesel, Sun Coast Converters, BD-Powers, Revmax, DPC, Diesel Site, Hays, Valair, and more!