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General Motors' GMT400 platform.

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Tranny slips from 1st to 3rd

Views on Youtube indicate several potential fixes Jump leads on the Command Module, replace solenoid or rebuild tranny innards... who knows how to be sure?

Answer this question I have this problem too

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First off, I'd check the transmission fluid if you haven't already. If it smells burned or is discolored, changing it might fix the problem.

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Don't Buy Chevy's, End Of Discussion.

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thanx for nothing. you are a big wasted effort!

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Jack will be eternally grateful.
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