Symptoms of broken automobile transmission shaft:

1. When the car starts or changes gears during driving, the transmission shaft will make impact sound, especially when driving at low speed on the high-speed gear.

2. When the car starts, the transmission shaft makes no abnormal noise, while when the car is driving, the transmission shaft makes a collision sound.

3. When the car starts, the transmission shaft makes no abnormal noise, while when the car slides, the transmission shaft makes abnormal noise.

4. The car makes a constant noise during the whole driving process.