Thanks for the explanation Carl. I feel the vibration in the steering wheel, but it spooks the passenger too! If I had a GoPro, I would expect to see the wheels pretty active.
As a rule of thumb, if you feel the vibration in the steering wheel it's steering related, if you feel the vibration in the seat it's driveline. You say the passenger can feel it as well, it very well be that you have more than one issue going on.
