How to Fix Transmission Whining Noise?
2 Answers
If the transmission emits a continuous high-frequency metal friction sound, it is usually due to insufficient or deteriorated gear oil. Adding or replacing the oil can eliminate the noise. If there is abnormal noise in neutral gear and the noise disappears when the clutch is pressed, the issue may lie with the clutch. The transmission can be removed to inspect the clutch. If abnormal noise occurs in all gears, it is typically caused by the rear bearing of the transmission output shaft. In this case, the transmission needs to be disassembled to check the bearing condition. If abnormal noise is present in direct drive gear, it indicates damage to the front bearing of the second shaft or the intermediate shaft bearing.
I was really scared when I encountered a humming noise from the transmission while driving recently. At first, I thought it was an engine issue, but after stopping to check the transmission fluid level, I found it was a bit low, so I added some new fluid myself to try. The noise reduced a bit when driving, but the humming was still there. A friend suggested going to a repair shop, and the mechanic used tools to diagnose that the bearing was slightly worn. It was fixed by replacing a small part. If you encounter a similar situation, first check if the fluid needs changing or if poor fluid quality is causing insufficient lubrication. Avoid highways, slow down, and drive carefully to prevent accidents. It's best to record a video of the noise and speed changes to bring to a professional shop for more accurate diagnosis. My personal experience taught me that small issues left unattended can lead to major failures.
