Problem has been getting worse on my '06 A3 8P2 3.2 Quattro with 80,000 miles. I have already ruled out tires and wheels, spacers and brakes, axle and cv joints. The vibration seems to be coming from the engine and traveling down from transmission through the axle to the front right wheel. We put it up on a hoist with and without any wheels and you can see the drive train wobble. At about 75mph it looks like- and feels like- the wheel might just shake off the car. Initial inspection shows no broken motor mounts, but we haven't removed them yet. Any ideas? (Note there is no misfire present)