Spark Plugs and Wires

What would cause your Dodge truck to shake when you get to 45 mph but once you go above 55 it stops if you already replaced spark plugs wires cap rotor throttle body?


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check your u joints on the driveline-there should be NO play in drivelines but that's what happened to me, after the shaking i had a sqealing grinding noise until i fixed the drivelines, could also be balance of the tires