The imbalance of the vehicle drive shaft will cause a periodic noise during driving. The faster the driving speed, the louder the noise.In severe cases, it can make the body tremble, the cab vibrates, and there is a numb feeling when holding the steering wheel.As the body shakes, various parts of the vehicle will loosen and cause accidents.Vibration in the cab can cause cracks in the solder joints.

　　Tighten the front wheel of the car with mats, use a jack to lift the middle and rear drive axles on one side of the car, start the engine, put on high gear, and observe the vibration of the drive shaft.During the inspection, notice that when the speed drops, if the shimmy increases significantly, it indicates that the drive shaft is bent or the flange is skewed.

　　The bending of the transmission shaft is the bending of the shaft tube, most of which are caused by the overload of the car.The drive shaft is seriously damaged due to overload and overhang.Although the intermediate support of the transmission shaft was strengthened and the strength of the flange fork was strengthened, the failure of fracture and damage still occurred.

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