Debris in the stock transmission cooler bypass valve can cause it to jam the internal valve, keeping it recirculation mode. When this happens, the tranmission temperature rises, which can lead to overheating and premature transmission failure. BD's Cooler Bypass Delete keeps your RAM 68RFE transmission cooler fully operational all the time by eliminating the failure-prone factory bypass valve, thus keeping your transmission temperature as low as possible. For more information, call 800-887-5030 or visit www.bddiesel.com.