Re: 2011 Mustang Vibrations
As others have said..return it to a Ford dealer, perhaps a different one.
It could be a few things but sounds like maybe a mount problem perhaps the transmission mount. If it has been driven on gravel or a rocky surface then it could even be a rock or something lodged in the trans mount area and causing a vibration. Exhaust mount is another possibility.
71 429SCJ Mustang