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Yes, I will agree with all. The trans., when in "D" shifts to 6th gear asap to save fuel. So the vibration is due to the engine lugging for a few seconds when you push the gas pedal, before the trans. downshifts to 5th or 4th. Many posts in the past 6 months have come up with this conclusion. Jeff Morris with Chev. Cust. Serv. has had some replies on this with no solution. Lets see what the owners of the 2012's say in a few months. Maybe GM will fix this for the new models.
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