Why does the car shake when driving at high speed?

[Deborah]

Here are the reasons for body shaking during high-speed driving: 1. Incorrect front wheel alignment angles, excessive toe-in. 2. Low front tire pressure or tire imbalance caused by repairs. 3. Deformed front wheel rims or incorrect number of tire bolts. 4. Loose installation of transmission system components, bent drive shaft, power imbalance, deformed front axle. 5. Failed shock absorbers, inconsistent stiffness of front leaf springs. When vibration occurs at higher speeds accompanied by steering wheel shaking, you can first lift the drive axle, place safety blocks under front wheels, start the engine and gradually shift to higher gears until the drive wheels reach the final test vibration speed. If both the body and steering wheel shake at this point, it indicates vibration caused by the transmission system.