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Re: Strange vibration at 60 MPH and above.
I had belts in my tires creep one time. The tires would balance out just fine, but were basically out of round. Caused a vibration around 70 mph and no other time. Took me a long time to figure it out. Belt creep caused by rotating tires to opposite side of truck and reversing the rolling direction. They were an old set of BFG KO A/Ts. Replaced the tires - smooth as glass now. Now I rotate front to back to keep rolling direction the same. Just something to consider.
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