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If you have an LT or SS, when you put the car in M (manual), Sport Mode is engaged.
Sport mode retains automatic shifting, but the shift points are more aggressive than when in Drive, and based on throttle inputs holds gears longer before shifting.
Touching the up shift paddle shifter will engage Manual mode which will allow you to manually up shift/downshift and will hold RPMs until you touch the tap shift again, so you could rev the engine to red line and it won't shift until you hit the tap shift. It also prevents you from downshifting to a lower gear if the engine speed is too high. The trans will automatically downshift to 1st gear when you decelerate to a stop. At least this is how it works for me...
If you have an 2LS, then the tap shift will set a gear limit of the trans. You can't up shift through the gears in a 2LS.
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