I think you're being nick picking here. Your unique test condition doesn't occur under normal driving at all. If you hop in any car with 100K miles, put in drive rev to 3K and hold on to brake pedal you will feel a vibration is guarantee.
Another word vibration is expected when you put 225 foot pound of torque into an engine with old engine and tranny mounts, the vibration will then transfer onto the suspension but the suspension can't dissipate the vibration because you are holding on to the brakes.
Now, if you have a vibration at 3K RPM while driving then it's another story.