Check out the Genderal Discussion forum titled "Anyone having problems with Vibration on G8 Gt's" (or something very similar). Just an FYI, my G8 Gt had the tires balanced, then road force balanced, then replaced and road force balanced, and now they are goinging to try to replace the engine and transmission mounts to see if that stops the vibration. I bought my G8 on March 27th brought it in the first time on April 2nd and have been trying to get the vibration issued relsolved ever since. I beleive the vibration is caused by the AFM kicking in that's why you only feel it at constant speeds.
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