What are the causes of abnormal noise during transmission downshifting?

[StLuna]

The causes of abnormal noise during transmission downshifting are: 1. Faults in the transmission's clutch, brake, buffer, or valve plate; 2. Insufficient transmission fluid. The functions of the transmission: 1. To change the transmission ratio and expand the range of torque and speed variation of the driving wheels to adapt to frequently changing driving conditions, while allowing the engine to operate under favorable conditions; 2. To enable the vehicle to reverse while maintaining the engine's rotation direction; 3. To interrupt power transmission using neutral gear, allowing the engine to start, idle, and facilitating gear shifting or power output. Transmission maintenance: 1. Regularly change the transmission fluid; 2. Frequently check the fluid level; 3. Avoid coasting in neutral; 4. Clean the transmission periodically; 5. Avoid forcibly disengaging gears; 6. Reduce the time spent idling to warm up the vehicle.