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What would cause a front end to during acceleration from 70-80 mph?

Several factors could cause the front end of a car to shake during acceleration from 70-80 mph. Some common causes include:

1. Unbalanced Tires: If the tires are unbalanced, they can cause vibrations that are felt through the steering wheel.

2. Wheel Alignment Issues: Incorrect wheel alignment can also lead to vibrations, especially during acceleration.

3. Worn or Damaged Steering Components: Worn ball joints, tie rods, or other steering components can contribute to shaking or vibrations.

4. Driveshaft Issues: Problems with the driveshaft, such as worn or loose u-joints, can also cause vibrations at higher speeds.

5. Engine or Transmission Mounts: Loose or worn engine or transmission mounts can allow excessive movement, leading to vibrations during acceleration.

6. CV Joint Issues: Worn or damaged constant velocity (CV) joints in the front axles can also cause vibrations when accelerating.

7. Axle or Differential Problems: Issues with the front axle or differential, such as low fluid levels or worn components, can lead to shaking or vibrations.

It's recommended to have the car inspected by a qualified mechanic to properly identify the cause of the shaking and have the necessary repairs performed to ensure safe driving conditions.