What Causes Body Shaking at 120 km/h?

[DeTaylor]

The reasons for severe shaking when driving at 120 km/h are as follows: 1. There is a pressure difference between the tires, leading to varying shock absorption capabilities, which causes the car to shake. Reinflate the tires to ensure consistent pressure across all tires. Passenger car tire pressure is generally between 2.4 bar and 2.5 bar. 2. The drive shaft is deformed or bent, or the drive ball joint is excessively worn, causing the vehicle to shake. The drive shaft can be removed for dynamic balancing, and the drive ball joint bearing can be replaced. 3. Differences in vehicle toe-in and kingpin inclination angles lead to body shaking. Adjusting these angles through a four-wheel alignment can resolve the issue. 4. Poor performance of the shock absorbers, which fail to effectively absorb vibrations. Inspect all shock absorbers and repair or replace any faulty ones. 5. Severe aging of the engine mounts, which cannot absorb the vibrations generated during engine operation, transferring them to the body. Remove the old engine mounts and replace them with new ones.

[JosiahDella]

It's quite common for the car to shake when driving at 120 km/h. Personally, I think the most likely culprit is a tire issue, such as unbalanced tires causing vibrations due to uneven weight distribution at high speeds. A bent axle or loose suspension components, like leaking shock absorbers or worn ball joints, could also lead to shaking. I recommend getting a wheel balancing test done immediately—it’s a small cost at a repair shop. Don’t delay, as it can accelerate tire wear or even warp the brake discs, increasing accident risks. During regular maintenance, always check tire wear and pressure. If you notice shaking on the highway, slow down to a safe speed and have a reliable mechanic inspect it thoroughly. Safety comes first—spending time on prevention is better than dealing with an accident later.

[Gabriella]

I've encountered this issue before when driving on the highway. At 120 km/h, the car would shake violently. After checking, it turned out to be caused by uneven tire pressure. Changing to a new tire solved the problem. Additionally, if the brake pads are newly replaced and not properly worn in, or if the wheel rim is damaged, the car may also shake at high speeds. It's best to first perform a simple self-check on tire pressure and wear condition. If that doesn't help, go to a professional shop for inspection immediately. Don't mess around with it—safety comes first. Shaking on the highway affects handling and can easily distract you. Once, I almost had an accident because I didn't address the issue in time. Developing a habit of regular maintenance, such as checking wheel balance every 5,000 kilometers, can save a lot of trouble.

[Brenda]

The shaking at 120 km/h is mostly due to tires or suspension. Unbalanced tires are the most common cause, but bent axles or uneven brake rotors can also cause it. Severe vibration at high speeds is unsafe, especially for older drivers who may struggle to control the vehicle. With years of driving experience, my advice is not to push through—slow down and pull over to check. If tires are unevenly worn or damaged, replace them promptly; otherwise, visit a repair shop for wheel balancing and alignment checks. Neglecting minor issues can lead to major repairs, costing both money and time. Paying attention to these details during maintenance ensures peace of mind and safety.