I notice when shifting from 6th into 7th at a low rpm the transmission will not lock right away. The reason I noticed it was when making the 6th to 7th shift the rpm would go up slightly if I get out of the throttle the rpm will drop back down 200rpm or so quickly like it is allowing for a little slip. I think it’s a stall feature to keep the rpm high enough for the gear you selected. Is this what you experienced?
However when I make an up shift at higher rpm say 4500 I get a much better lock in the transmission no slip. The higher the rpm when up shifting the harder the shift or transmission lock.
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2011 Black Corvette Grand Sport 6spd | NNP Daul Mode Exhaust
2008 Trail Blazer SS Black | SuperChips Tune
2009 370Z Black 7AT Touring Sport (TRADED)
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