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First area to check would be the tires - a weight knocked off, bad balancing job, a good sized gob of road debris, or, as unlikely as it may seem, a slightly out of round tire. Don't see much of it anymore, but it was not unusual in the 60's and 70's - used to get the tires siped (run on a machine similar to a wheel balancer, with a sharp blade on it - it would knock off the high spots) for any of my performance toys.
Weirdest one I had was on a front winter tire - I had left them outside, one had gone flat, and water had seeped into it. It would be fine at slow speeds, but once centrifugal force moved all the water to one spot, it shook like an off balance washing machine.
Weirdest one I had was on a front winter tire - I had left them outside, one had gone flat, and water had seeped into it. It would be fine at slow speeds, but once centrifugal force moved all the water to one spot, it shook like an off balance washing machine.
