1. Driveshaft Imbalance: The driveshaft is a rotating shaft that transmits power from the transmission to the wheels. At high speeds, an imbalance in the driveshaft can cause vibrations due to uneven weight distribution. This imbalance can occur due to factors such as a bent driveshaft, worn or damaged U-joints (universal joints), or improper installation.
2. Worn or Damaged U-Joints: U-joints connect the driveshaft to other parts of the driveline. If the U-joints are worn or damaged, they can cause excessive play and looseness in the driveline, leading to vibrations at high speeds. Worn U-joints can also produce a clicking or clunking noise.
3. Transmission Issues: In some cases, vibrations at high speeds can also be caused by transmission problems. For instance, worn or damaged transmission mounts or internal issues within the transmission can create vibrations that are felt throughout the vehicle.
4. Wheel and Tire Problems: Although less common, wheel and tire issues can also contribute to vibrations at high speeds. For example, uneven tire wear or improperly balanced wheels can cause the car to vibrate.
When you put the car in neutral, the driveline is disengaged from the engine, which stops the rotation of the driveshaft. This eliminates the source of the vibration, which is why it quits when you put the car in neutral.
To resolve the issue, it's important to have the car inspected by a qualified mechanic. They can identify the specific problem, whether it's a driveshaft imbalance, worn U-joints, transmission issues, or wheel and tire problems, and recommend the necessary repairs or replacements to ensure smooth and safe operation at all speeds.
