- Differential Failure:
- One of the most common causes of a rear humming noise that worsens with acceleration is differential bearing failure. Your car's differential helps to distribute power to the wheels, allow them to turn at different speeds when cornering.
- Wheel bearing failure:
- Bad wheel bearing is another common culprit of a rear humming noise. Wheel bearing allow your wheels to spin smoothly, and worn-out bearing generates humming or growling noises.
- Tire Tread Wear:
- Uneven tire tread wear or scalloping can cause a humming noise that seems to come from the rear when accelerating.
- Driveshaft Issues:
- Excessive play or worn universal joints in the driveshaft can also generate a humming sound from the rear.
Recommendation:
- Inspect your car's rear differential and wheel bearings for signs of wear, damage or leaks.
- Check the tire treads for evenness and replace if necessary.
- If the driveshaft is causing the noise, inspect the universal joints for play or damage and replace if needed.
It's important to address this issue promptly to prevent further damage and ensure your safety while driving.
