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Message: [QUOTE="Racer X, post: 84919, member: 1934"] Ok. How we would diagnosis this would be to plug an expensive transmission tester in. :D Without one, if you haven't already done it: check for external problems and make sure the OD light is working. If OK, then I'd drive it until it reaches normal operating temperature. Then see if it slips at all under more throttle when it won't shift into 3. I'd only do that once. :) If your not feeling any slipping when it won't shift into 3, or in other gear ranges and no codes are present: a valve problem is the most likely cause from the info in your thread. . [/QUOTE]

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