Why Does My Car Shake At 70 Mph? (11 Reasons Why)

When you drive a car at high speed, you want your drive to feel smooth. However, you may realize your car starts shaking once you reach high speeds.

Are you wondering why your car shakes at 70 miles per hour? We did some research, and here are the facts we found about why this happens!

Why Does My Car Shake At 70 Mph?

Cars shake at 70 mph often because the tires are out of balance, which could mean the tires have low tire pressure, are not even, etc. Plus, issues with the brake system like the brake rotors or calipers can make your car shake. Additionally, a starved engine lacking certain fluids can shake cars at 70 mph.

Do you want to find out more reasons why your car starts shaking at 70 miles per hour? We made a list of reasons below, so keep reading!

1. CV Joints

Occasionally, your car’s CV joints, which aid in your car suspension’s up and down movements, can make your car shake at 70 miles per hour.

Usually, issues in the inner CV joints occur under heavy load or hard acceleration, but the issues are hard to spot, especially if you have a rear-wheel vehicle.

Depending on how severely damaged your CV joints are, you could experience mild vibrations or intense shaking when you drive fast.

2. Tires Are Out Of Balance

Another common reason why cars shake at 70 miles per hour is that the tires are out of balance.

Normally, a steering wheel vibrates from being out of balance, which can cause a shakey drive.

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Plus, tires can be out of balance because they are unevenly worn out, making it harder for you to drive the car, especially at high speed.

Also, you may not realize your car is shaking if you drive slower than 50 miles per hour, but you notice it once you reach 60-70 miles per hour.

3. Brake Caliper

Another cause of a car shaking at 70 miles per hour is the brake caliper, and a brake caliper helps slow down the car wheels when you hit the brakes.

Usually, your brake calipers would be the problem whenever the brake calipers are “sticky” since sticky brake calipers create vibrations in the steering wheel, leading to a shaky car.

Normally, the shaking gets worse when you drive faster, especially at a speed like 70 miles per hour, because the brake calipers have a harder time working.

Plus, you would know if your brake caliper is the issue because there would be a slight burning smell when you stop the car.

4. Low Tire Pressure

Low tire pressure can typically cause a car to shake at 70 miles per hour, especially if only one or a few tires have low tire pressure.

That said, this is because the wheels will not be even, so you will feel a “shaky” motion when you drive, particularly when you drive fast.

Luckily, this is an easy fix since you just need to inflate certain tires until they reach the recommended pressure.

5. Brake Rotors

Other than your brake calipers, your brake rotors could be the cause of your car shaking at 70 miles per hour.

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Generally, brake rotors are at fault when the rotors are “out of round,” meaning the rotors are warped.

Typically, you would notice your car beginning to shake at 60 miles per hour and even more so at 70 miles per hour.

Usually, brake rotors become warped when you are frequently stuck in city traffic, have heavy loads, or dirt has built up in the brake rotors.

6. A Starved Engine

A Starved Engine

Engines require sparks, fuel, and oxygen to run smoothly because if the engine lacks those aspects, the car will experience shaking and jerking at speeds like 70 miles per hour.

Typically, an engine that lacks oxygen, fuel, or a spark will have a vibration coming from the engine area.

Normally, you can check to see if the spark plug is in good condition and replace it if it is damaged or worn to help the ignition.

Also, you will want to make sure the air and fuel filters are clean and replace these filters as needed.

7. Transmission Fluid

Your car’s transmission system needs fluid to help the car switch gears smoothly, and being low on transmission fluid can cause your car to jerk and shake, especially when you switch gears.

Usually, you need to top off your transmission fluid to prevent these issues since transmission fluid helps lubricate the moving parts.

8. Old Suspension Components

If you notice that your car vibrates a lot when you hit 70 miles per hour, your worn-out suspension and differential mounts could be the cause.

Typically, it would be best to make sure you can replace the suspension and differential mounts as needed to fix the shaking.

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However, some people may find it cheaper to replace the car altogether, depending on the damage.

9. Disconnected Or Damaged Vacuum Or Air Hose

The spark, fuel, and air are not in the ideal proportion to the engine when the vacuum or air hose is disconnected or damaged.

When this occurs, your car’s sensors get confused due to a lack of pressure, making your engine vibrate.

10. Problems With Your Axle

The cause of your car shaking at 70 miles per hour could be your axle, especially if your car has recently had a collision.

When a car gets hit, and the axle gets bent or damaged, the car can vibrate aggressively, especially when you drive fast.

11. Engine Sludge

Your engine needs oil to run smoothly, but the engine oil eventually creates deposits that are thick sludge that can make your engine shake.

Therefore, you need to have your engine properly cleaned and change your engine oil regularly to avoid this situation in the future.

Conclusion

While a car can shake for all sorts of reasons, there are often specific causes that can make your car shake at 70 miles per hour.

That said, some of the most common reasons your car shakes at 70 miles per hour include a problem in your brake system, a starved engine, axle issues, and more.

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