Edmunds Answers

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  • karjunkie 08/29/09 8:57 am PST

    I'll assume you have a 46RE tranny on this truck as it is the most common unit. This tranny has a lot of OD problems. Have you checked the fluid color and condition? Many of these problems are related to a clogged anti drain back or check valve or other dirty ATF fluid problems, so the first thing to do is to Add some Seafoam Trans Tune, run the truck for a week or so and then drain and refill the transmission with synthetic ATF4+ fluid and replace the filter. This should be done every 40K miles on this tranny and NEVER add any other fluid than the ATF4+ because if you do it will ruin the tranny. Once a fluid change is done and you still have problems, then check the overdrive solenoid in the valve body as these are prone to electrical failure. Good luck and let me know what happens.

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