Why is the car shaking severely?

[StStephen]

The severe shaking of the car may be caused by the following three reasons: Wheel imbalance: Wheel imbalance is a common issue in many vehicles. During manufacturing, it is impossible to ensure uniform quality of tires and steel rims, so wheels must undergo dynamic balancing after assembly. Moreover, as tires wear over time, periodic dynamic balancing is necessary after certain mileage. Loose suspension structure: The chassis suspension consists of various links and support arms, which are connected through ball joints and rubber bushings. Normally, these components are tightly connected, but as the ball joints and bushings wear out, the connections loosen, causing the suspension to become loose and resulting in body shaking while driving. Excessive steering gear backlash: The steering system of a car uses a rack-and-pinion mechanism to convert the rotational motion of the steering wheel into the swinging motion of the wheels. Over time, wear between the rack and pinion creates backlash, causing slight left and right movements of the wheels even without steering input, leading to a sensation of body shaking.