What Causes Body Shaking During High-Speed Driving?
2 Answers
Here are the reasons for body shaking during high-speed driving: 1. Misalignment of front wheel positioning angles, excessive toe-in. 2. Low front tire pressure or imbalance caused by repairs or other reasons. 3. Deformation of front wheel rims or incorrect number of tire bolts. 4. Loose installation of transmission system components, bent drive shaft, power imbalance, or deformation of the front axle. 5. Failure of shock absorbers or inconsistent stiffness of front leaf springs. If vibration and steering wheel shaking occur at higher speeds, you can first lift the drive axle, place safety blocks in front of the wheels, start the engine, and gradually shift into higher gears to reach the final test vibration speed of the drive wheels. If both the body and steering wheel shake at this point, it indicates vibration caused by the transmission system.
I usually drive on the highway, and when I go over 100 km/h, the car body shakes violently, which really bothers me. It's probably due to unbalanced tires, as the vibration from the front wheels is the most direct cause of body shaking. Or there might be uneven tire wear, like not having done balancing or rotation for over a year. Another possibility is loose wheel axles or bearings, causing unstable rotation. Warped brake discs can also contribute, especially after sudden braking. I should go to the shop for a dynamic balancing test as soon as possible—it's not expensive, just around 20-30 yuan. Don't delay; severe shaking makes handling difficult, and an accident could be disastrous. I’ve experienced it once before, and after balancing, the shaking stopped completely, making highway driving much smoother. Also, check the tire pressure—it shouldn’t be too low or too high, as this can also prevent shaking.
