Shaking

Does anyone know of how I can stop my car from shaking. Cuz everytime I go over 60 my car shakes; the steering wheel shakes; the gas pedal shakes; and my passenger seat shakes. Does anyone know why.

To diagnose the cause, look at the tires and wheels first. A problem with front tires will make the steering wheel shake, rear tires make a shake you can feel in the seat and body. I think you are describing a serious tire balance problem that could be caused by mud on wheels, tire sealer globbed inside of a tire, a bent wheel or most likely separated belts in a tire. Raise the front end off of the ground and then the rear to inspect using a block of wood, or stand a hammer on end so you can see if each tire is out of round or wobbles in and out as you turn the tire by hand. Tires that end with a violent explosion at freeway speeds have separated belts.