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Message: <blockquote data-quote="Macwho" data-source="post: 21381" data-attributes="member: 7704"><p>The transmission shifts into 6th gear, which is overdrive, at about 32 mph causing the drivetrain to vibrate as though you had a standard shift transmission in too high of a gear! When you speed up to about 40mph the vibration disappears. Try putting the transmission shifter in L and press the H on the shifter until it shows 5 on the dash indicator. Drive the car up through 35-40 mph, guess what? No vibration! Over 40mph simply press the H on the shifter again for 6th gear overdrive. As a bonus when you shift into L the engine stays on as opposed to stopping and re-starting at every stop light. Yea this is some kind of BS that the car vibrates I had it in for this on 3 occasions and there isn’t any solution because GM has no intention of rectifying it. If I had known about this I wouldn’t have leased this Car.</p></blockquote><p></p>