Why does your car start to shake when accelerating above 40mph?

Answer

first check your balance on you tires local tire shop will usually balance new tires for free or if you have a reciept from where you purchased the tires some tire shops will balance for free if you bought the tires there if tires are not balanced it causes the vechicle to shake at about 30 mph if thats not it i dont know

Answer

IS it a shake from the engine or a vibration that you feel? It very well may be a tire or rim problem, or it may also be an engine miss loose suspension etc..

Answer

If it snowed recently, and the problem did not exist before the snowstorm, there may be frozen snow/ice stuck to one or more wheels, causing imbalance. Take the care to a self-serve car wash and spray the wheels from underneath the car and in the wheel wells.

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