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Why is your car shaking and knocking when you get over 50 mph?

Several factors could cause your car to shake and knock when you exceed 50 mph:

1. Tire Issues:

- Unbalanced Tires: If your tires are not properly balanced, they can cause vibrations at higher speeds.

- Loose Lug Nuts: Make sure your lug nuts are tightened correctly. Loose lug nuts can cause the wheel to wobble, resulting in shaking.

2. Wheel Alignment:

- Misaligned Wheels: Incorrect alignment can cause uneven tire wear and lead to vibrations.

3. Suspension Problems:

- Worn Suspension Components: Worn or damaged ball joints, tie rod ends, or control arm bushings can cause knocking sounds and shaking.

4. Driveshaft Issues:

- Worn CV Joints: Constant velocity (CV) joints in the driveshaft can become worn and produce a knocking noise.

5. Engine Mounts:

- Loose or Worn Engine Mounts: Worn or loose engine mounts can cause the engine to move excessively and create shaking.

6. Wheel Bearings:

- Faulty Wheel Bearings: Failing wheel bearings can cause knocking noises and affect the vehicle's handling.

7. Transmission Problems:

- Low Transmission Fluid: Insufficient transmission fluid can lead to internal components malfunctioning, resulting in shaking and knocking.

8. Brake Issues:

- Warped Brake Rotors: Warping of the brake rotors can cause vibrations when braking and at higher speeds.

If the shaking and knocking persist or worsen, it's essential to have your vehicle inspected by a qualified mechanic to accurately identify and resolve the underlying issue. Driving with these symptoms can compromise safety, worsen the problem, and potentially lead to more costly repairs in the future.