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Re: Real Quick Question
It would help to post what year and model Grand Prix. On 4 speed autotransaxles TCC lock up and 4th gear are not the same although lockup occurs in 4th gear - OD. It should shift to 4th gear first and then at a certain speed you should see TCC lockup.
Note: On some occasions it may occur at nearly the same time depending on driving conditions and engine parameters.
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