For front-wheel drive vehicles, the drive shaft is a constant universal joints, and some universal joints are sealed with a rubber sleeve. If the rubber sleeve is damaged, the sand will run into the universal joints when the vehicle is moving, which will accelerate its wear and shorten its life.
Therefore, it should be checked regularly to ensure the rubber sleeve of the drive shaft is intact. How to tell when it breaks: there will be extremely viscous oil on the rim and the engine bottom. If the steering wheel hits the end and there is a "beat" sound, it means that the universal joint is damaged and should be replaced.
For the rear-wheel drive vehicle, the drive shaft uses two non-equal speed universal joints. When the car starts, accelerates, and decelerates, the bottom of the car emits a "cracking" sound, indicating that the non-equal universal joints need to be replaced.www.morayshaft.com