What is the reason for the abnormal noise when shifting to D gear and stepping on the brake?

[EloiseMarie]

The reason for the abnormal noise when shifting to D gear and stepping on the brake is due to severe wear of the ball joint under the gear, which requires replacing the gear oil or the ball joint. The ball joint, also known as the universal joint, refers to a mechanical structure that uses a spherical connection to transmit power between different axes. The causes of ball joint wear are as follows: 1. Poor performance of the shift fork shaft and too small clutch travel: Severe wear requires checking the corresponding movement position of the ball joint. 2. Excessive viscosity of the transmission oil and excessive wear of the synchronizer. 3. Poor performance of the clutch pressure plate, excessive wear of the synchronizer, and reduced performance of the clutch oil due to temperature effects.