I second the driveshaft investigation, mine has three shafts with two midship bearings. I would then suspect out of round or out of balance tire/wheel. The wife and I will be going right by you in Kalamazoo Friday morning, headed west to visit our son.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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