Sometimes, while driving or even when the vehicle is idling, a whining noise can be heard from the gearbox, which usually indicates problems within the gearbox system. This noise is not only annoying but also a sign of wear and damage to the internal parts of the gearbox. Ignoring this sound can lead to more serious gearbox failures. In this article, we will examine the various causes of gearbox whining and explain the methods to fix it.
Causes of whining noise in manual and automatic transmissions
Whining noise from the transmission can have various causes, which we explain below:
- Low transmission fluid level
One of the most common reasons for transmission whining noise is a low transmission fluid level. Transmission fluid plays a vital role in reducing friction among moving parts. When the fluid level drops, moving parts like gears rub against each other causing noise. To fix this issue, refill the transmission fluid and ensure there are no leaks in the system. - Degradation of transmission fluid
Over time, transmission fluid loses its properties and may increase friction between parts, causing whining noises. Regular replacement of transmission fluid with high-quality and standard fluid is recommended to avoid this problem. - Incorrect transmission assembly
If the transmission was not assembled correctly after repair or when installing a new unit, the internal parts might not mesh properly, leading to unusual noises. This requires disassembly and correct reassembly of the parts. - Clutch wear (manual transmission)
In manual transmissions, clutch plate wear is a common cause of whining noises. When the clutch is engaged, a whining or moaning noise is heard from the front of the vehicle. Replacing the clutch plate resolves this issue. - Problems with shift fork or shift rod (manual transmission)
In manual transmissions, when the gear lever moves, its motion is transmitted via the shift rod to the shift fork, which engages the gears. Damage or wear in the shift fork or rod (such as broken springs, balls, or worn rods) can cause whining noises. Damaged parts must be replaced.
Cause of transmission whining
A common problem that may cause whining noise during driving or acceleration is wear or looseness of the transmission’s internal bearings. This usually indicates serious issues within the transmission that require immediate attention.
Wear or play in transmission bearings
When a whining noise is heard from the car’s transmission, especially during acceleration, one possible cause is wear or play in the internal transmission bearings. Bearings are components that allow the internal parts of the transmission to move smoothly and with minimal friction. However, due to constant contact with other parts, these bearings are easily exposed to wear and tear. When the bearings become worn or loose, the movement of the transmission parts is disrupted and a whining noise is heard from the gearbox. In such cases, the best solution is to replace the worn bearings.
Solutions to eliminate transmission whining noise
There are several ways to reduce the whining noise coming from the transmission. One of these methods is using transmission oil additives. These additives usually contain nano-ceramic materials that effectively coat the surface of the transmission gears and create a protective layer on them. This protective layer reduces friction between the internal parts of the transmission, thereby decreasing the whining noise. It is recommended to add these additives along with fresh transmission oil to the gearbox to help improve its performance.
In conclusion
In this article, we reviewed various causes of transmission whining and possible solutions to fix this problem. From bearing wear to using transmission oil additives, all are effective ways to reduce whining noise. If you encounter such noises, we recommend promptly addressing the necessary repairs. Ignoring these sounds can lead to more serious transmission problems in the future, resulting in costly repairs.