This article contains affiliate links. Using any of the links on this page will allow me to earn a small commission at no additional cost to you. When a vehicle trembles, it can be extremely unsettling. If you notice any vibrations coming from your automobile, it’s best to get it fixed as soon as possible so that you can keep driving safely.
Several factors might cause a car to shake when traveling at speeds greater than 70 mph, including out-of-balance tires, brake system problems, an underpowered engine, uneven tire wear, and so on. For our discussion today, we’ll be looking at the various reasons why this might happen.
Why Car Shakes When Driving Over 70mph
Many factors contribute to car swaying when traveling at speeds exceeding 70 mph, however the following are the most frequently seen ones:
1. Out-of-Balance Tires
When an automobile is out of balance, it can cause vibration and a cupped or scalloped wear pattern at higher speeds, most notably 70mph. Driving over potholes, bridge expansion joints, and curbs can induce tire imbalance, which results in steering wheel vibration that travels through the seats and floor of the car.
2. Misaligned Wheels
Potholes cause misaligned wheels, which in turn cause the automobile to tremble when travelling at speeds above 70 miles per hour. Correct wheel alignment, involving the angle at which wheels strike the road, will fix this issue.
3. Faulty Brake System
Sticky brake calipers and rotors cause vibrations in the steering wheel as soon as the vehicle reaches 45 to 50 mph. As you approach 70 mph, the shaking becomes more intense, and you’ll notice a burning smell when you come to a complete stop.
This means the rotors need to be re-indexed or replaced if they are too worn to be re-indexed or replaced.
4. Worn Parts
Vibrations can be caused by the breakdown of other parts of your vehicle. Ball joints and tie rod ends are just some of the components that make up a suspension system. The worn-out wheel bearings and tie rods that cause the wheels to oscillate and generate high-pitched whining or grinding noises can be found during wheel alignment and should be replaced.
5. Uneven Tire Wear
A broken belt or a slipped belt might cause your tires to vibrate or bounce, causing your vehicle to shake. Even new cars have this problem, because low-quality tires wear out more quickly. The best way to determine which tire needs to be replaced is to drive the vehicle at a high enough speed to feel the vibration source.
6. Runout Wheel
A runout wheel, which refers to any component of a wheel or tire assembly that is not completely round, can cause shaking when traveling at speeds above 70 mph. Tires with misplaced or broken belts may fall into this category. Wobbling and excessive rattling are the results of this dynamic problem. Dial indication or a tire runout gauge can be used to determine the cause of this issue, however it is advisable to examine the middle of the tire wall and on an even surface for optimal results.
7. Low Tire Pressure
When traveling at speeds above 60 mph, your automobile rattles, which is why you should always carry a tire pressure tester and an inflator with you at all times. Preventing a significant decline in tire pressure can be achieved by increasing tire air pressure by around 3 psi over manufacturer recommendations in the coldest of temperatures.
8. Engine Starvation
In order for a vehicle to run correctly, it needs a certain amount of air, fuel, and a spark plug. To avoid jerking and shakiness while driving at speeds of more than 70 mph, it is essential to have the following in your car:
Changing the fuel and air filters on a regular basis will ensure that the engine is never deprived of the fuel or air it needs, thus ensuring that it runs at its best.
9. Shabby Suspension Components
Car tremors are most common between 50 and 75 miles per hour. However, if the shaking begins at a given speed and then worsens, the differential and suspension mounts are most likely to blame. A new car may be necessary if the damage to the suspension components is so extensive that the entire system must be replaced or rebuilt.
10. Overworked Powertrain
While reversing, it makes a clicking sound. When braking, a vehicle with a bad CV axle shaft may shake. Also, if your clutch, flywheel, gearbox, and steering rack components have been severely worn and abused, you’ll notice a vibration when you exceed 70 mph. It is typical for an automobile to vibrate when travelling at speeds above 70 mph because of the preceding variables. Other possible causes of automobile tremors at speeds in excess of 70 mph include:
The incorrect octane of gasoline
Filthy engine oil
What is the car made of?
Driving in a reckless manner
CV joints that don’t fit properly
A lot of squats
Spark plugs or spark plug wires that have stopped working.
Connected hoses must be reconnected
Seemingly unrelated factors can all contribute to a car’s unsteadiness at speeds in excess of 70 mph. A driver should always consult with their technician if they feel vibration in their automobile while traveling at a specific pace. They can then perform an inspection and repair as necessary. Nevertheless, if you’re handy with a wrench and know how to fix your own vehicle, we recommend that you do a thorough inspection for any of the issues listed above.
Avoid driving your automobile if you spot an abnormality, as this might lead to more significant damage and even an accident..