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2008 Ford Mustang shakes at some speeds

I drive a 2008 Ford Mustang, when I get to 55 to 60 mph the car starts to shake pretty bad but as soon as I hit 70 the shaking stops. What would be causing the car to shake?

A tire out of balance could cause that. So could a failing center driveshaft support bearing.

I will ask if your car has springs that lower it. That can throw the driveline angles off and cause a vibration at a certain speed.