car will not go into over drive
I performed a trans service. Heated the atf to 86 degrees f and topped off. Car shifted through all the gears but when I got into traffic and slowed down and started moving again ,the car would not go into overdrive and the engine light came on with the code for improper gear ratio for gear 3 and 4. i shut the car off and back on and the car shifted through all the gears again perfectly. This is how I know must drive the car. How can I stop this from happening.
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