What are the symptoms of a broken driveshaft in a sedan?

[LucasLee]

Symptoms of a broken driveshaft in a sedan: 1. There is a knocking sound from the driveshaft when starting the car or shifting gears while driving, especially noticeable when driving at low speeds in high gear; 2. No abnormal sound from the driveshaft when starting the car, but knocking sounds occur while driving; 3. No abnormal sound from the driveshaft when starting the car, but strange noises appear when the car is coasting; 4. Continuous noise throughout the entire driving process. The driveshaft is the component in the universal transmission device that transmits power, functioning as a high-speed, minimally supported rotating body. Generally, driveshafts undergo dynamic balancing tests before leaving the factory and are adjusted on balancing machines. For front-engine, rear-wheel-drive vehicles, the driveshaft transmits the rotation from the transmission to the final drive axle. It can consist of multiple sections connected by universal joints.