Damage, wear, deformation, and loss of dynamic balance in the driveshaft components can all cause abnormal noises and vibrations during vehicle operation, and in severe cases, lead to damage to related parts. If a car makes a "clunking" sound during starting or rapid acceleration, and there is a noticeable looseness in the components, and it's not due to looseness in the drive axle transmission gears, then it's clearly due to looseness in the driveshaft components. The loose parts are usually the universal joint cross bearing or the steel cup and flange fork, or the splined shaft and splined sleeve of the telescopic sleeve. Generally speaking, the play between the universal joint shaft diameter and the bearing should not exceed 0.13mm, and the meshing clearance between the telescopic splined shaft and the splined sleeve should not exceed 0.3mm. If these limits are exceeded, repair or replacement is necessary.
If a "humming" sound occurs from the chassis while the car is running, and the sound becomes louder at higher speeds, this is generally due to wear and looseness in the universal joint cross bearing, wear in the driveshaft intermediate bearing, damage to the intermediate rubber support, or a loose hanger, or it may be due to incorrect mounting of the hanger.
