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I would say your tires are out of balance or one has separated. If you feel it more in the steering wheel its a front tire. If its more in the drivers seat its a rear tire. That is the most common problem.

Matt Demick

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Q: If an 86' Pontiac firebird shakes anytime I get on the highway an I'm about to reach 45-50 mph it starts to shake violently what could cause it to shake?
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