What Causes Transmission Abnormal Noise?
2 Answers
Transmission abnormal noise may be caused by bearing wear or damage, insufficient or excessively viscous lubricating oil leading to uneven lubrication, or long-term failure to replace automatic transmission fluid. The following are detailed reasons for transmission abnormal noise: 1. Bearing wear or damage: When bearings wear out, the clearance increases, leading to reduced precision in component fit. Damaged bearings cannot operate normally, resulting in abnormal noise and potentially causing damage to transmission components, thereby exacerbating the fault. 2. Insufficient or excessively viscous lubricating oil causing uneven lubrication: In such cases, the corresponding lubricating oil (grease) must be replaced; otherwise, it will accelerate transmission wear and shorten its service life. 3. Long-term failure to replace automatic transmission fluid: Prolonged failure to replace automatic transmission fluid causes it to thicken and lose effectiveness, reducing the protective layer between components and increasing friction, thereby accelerating mechanical wear. In severe cases, it can damage components such as the automatic transmission planetary gear set and differential. Damage to internal components also leads to abnormal noise in the automatic transmission.
I've been repairing cars for over a decade, and there are many reasons for transmission noises. For example, worn bearings can produce humming or rattling sounds, usually caused by insufficient lubrication or long-term overloading. Damaged gears can also make clicking or crunching noises, especially in older vehicles where gear mismatches during shifting can lead to trouble. Low or deteriorated transmission fluid is another hidden danger – when the fluid goes bad, increased friction brings abnormal noises. Synchronizer issues are also common, often caused by rough shifting in manual transmissions. It's best not to delay – find a reputable repair shop to diagnose with proper equipment. Fixing minor issues can save big money compared to replacing the entire transmission for tens of thousands. Remember to change fluids regularly, shift gently, and avoid overloading to extend its lifespan.
