There are various manifestations of damage to gearbox gears, mainly including the following aspects:

Abnormal noise:

When the gearbox gears are damaged, abnormal noise may be generated during vehicle operation, which may be metal friction or impact sounds. Abnormal noise usually indicates abnormal wear or damage between gears.

Difficulty in shifting gears:

Damaged gears may cause difficulty shifting, and even prevent shifting into a certain gear. This may be due to poor gear meshing or damage.

Abnormal driving:

The vehicle may experience abnormal shaking or weak acceleration during driving. Jitter is usually caused by transmission imbalance due to gear damage, while weak acceleration may be due to reduced transmission efficiency caused by gear damage.

overheated:

Damaged gears may cause the gearbox to overheat, and in severe cases, may lead to a fire. Therefore, if the gearbox is found to be overheated, it should be stopped immediately for inspection.

Fuel consumption increase:

Due to damaged gears, the power transmission efficiency may decrease, and the vehicle may experience an increase in fuel consumption. This is because after the gears are damaged, the engine requires more power to overcome additional resistance.

Abnormal oil:

The oil in the gearbox may have abnormalities, such as black color, odor, etc. This may be due to metal debris generated by gear wear mixed into the oil.

Fault light on:

Some vehicles may have transmission related fault lights on the dashboard, which may light up when the gears are damaged. This is a sign that the vehicle's electronic control system detects an abnormality in the transmission and alerts the driver.

Odor generated inside the box:

After the gearbox gears are damaged, they may produce abnormal odors due to friction, which are usually caused by overheating of the gear oil or gear wear.

In summary, there are various manifestations of gearbox gear damage, and drivers should closely monitor the changes in the vehicle during driving. Once any abnormal symptoms are detected, they should immediately stop the vehicle for inspection and seek the help of professional maintenance personnel.