What Causes the Transmission to Buzz at High Speeds?
2 Answers
When the transmission buzzes at high speeds, the reasons include bearing wear and damage, long-term lack of transmission fluid replacement, and the use of inferior transmission fluid. Relevant details are as follows: Bearing Wear and Damage: When bearings wear out, the gap increases and the fit precision decreases. When bearings are damaged, they cannot operate normally, leading to abnormal noises and even causing damage to transmission components, which can escalate the issue. Long-Term Lack of Transmission Fluid Replacement: Over time, transmission fluid thickens and loses its fluidity, resulting in a lack of protective layer between components. This leads to direct friction, exacerbating mechanical wear and causing abnormal noises. Use of Inferior Transmission Fluid: Inferior transmission fluid has poor temperature resistance and is prone to oxidation, forming sludge and debris that can clog filters and oil passages. This increases friction between internal transmission components, leading to abnormal noises in the vehicle.
I noticed that the transmission makes a humming noise at high speeds, which is mostly caused by bearing wear or insufficient lubrication. Inside the transmission, multiple bearings operate under high-speed rotation. If the oil level is low or the oil quality deteriorates, increased friction will generate noise. Damaged or loose gear sets can also produce a humming sound. I once experienced this issue with an old car—the noise was particularly noticeable at high speeds. I recommend first checking the transmission oil yourself to see if it's low or needs replacement. If the oil is fine, there might be internal component damage, and it's best to have a professional technician diagnose it with specialized tools. Avoid driving under such conditions to prevent safety risks. Regular maintenance, including timely oil changes, can effectively prevent this issue and extend the lifespan of the components.
