* Driveline vibration. This can be caused by a number of things, such as a worn or damaged driveshaft, a bent axle, or a loose or damaged wheel bearing. When the driveshaft is out of balance, it can cause the car to shake at certain speeds.
* Tire imbalance. This can occur when the tires are not properly balanced, which can cause the car to shake at certain speeds.
* Wheel alignment. If the wheels are not properly aligned, it can cause the car to shake at certain speeds.
* Engine misfire. This can occur when one or more of the engine's cylinders is not firing properly, which can cause the car to shake at certain speeds.
If your car is shaking really bad at 33MPH to 37MPH, it's important to take it to a qualified mechanic to have it diagnosed and repaired.
