USUALLY a vibration between 55-60 is a tire balance problem. Does the vibration come and go regularly, or is it a constant? Worn shocks could be contributing to the problem if they have allowed the tire top hop up and down while driving, eventually wearing flat spots on the tire, which makes it worse, until it can be felt. But, like Steven said, we need more info to be able to steer you in the right direction.
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Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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