http://www.fostertire.com/tcm_vbrt.htm
Some helpful information. Seems likely that I may have some tires out of balance.
Quote:
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Anytime the seats and floor of your car vibrate when you are traveling over 35 miles per hour have the transmission mounts, front drive axle shafts and drive shaft checked. This can even be caused by a faulty vibration damper. If nothing can be found that would cause the vibrations check to see if the exhaust system is making contact with the chassis. Also, check for broken or loose clamps. When your car vibrates only when you are traveling at high speeds this is usually a sign that your tires are out of balance. Although some amount of vibration is normal in the dash and especially on transverse engine front drive cars, if the vibration becomes a rattle you will need to check your panels and brackets. Press your hand over the area on the dash where the noise is coming from. If the noise is eliminated or reduced you will need to tighten the retaining screws. If this still doesn't stop the noise, loosen the panel and slip a sheet of rubber under the panel before tightening the screws. Wind noises can usually be traced to bad weather stripping. Tape the window shut and if the noise stops, have the weather stripping replaced. If the noise does not stop check the grille to see if you have a broken section. You can test this by taping the section and driving the car. If the noise stops you will need to have the grille or grille section replaced. Do not leave the tape on the grille since this could cause your car to over heat. A whine under the body of your car could indicate that the rear axle or front drive final drive unit is faulty. Have them checked and serviced by a professional mechanic.
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http://www.allsands.com/potluck3/tro...ing_udr_gn.htm