2017 Hyundai Sonata - CV Half Shaft / Axle Shaft

How Do CV Shafts Work?

The CV shafts on a front- or four-wheel drive vehicle transfers power from the transaxle or differential to the hubs to drive the wheels. CV shafts, or constant-velocity shafts, include CV joints on both ends that allow them to rotate without binding, even as the suspension moves or the vehicle turns. These joints are covered with a rubber boot to keep the joint properly greased and to prevent debris or grit from contaminating the grease or damaging the CV joint. Most CV shafts are greased from the factory and do not require regular maintenance, but a torn boot can lead to grease leaks or contamination that could result in premature wear. In some cases, the CV boots may be able to be replaced, but in most circumstances, it is better to replace the entire CV shaft if it has been damaged. The CV shafts on your vehicle are subject to wear and tear over their lifetime which can cause the joints to wear and loosen, which may lead to driveability issues, noise, and other symptoms. If you notice dark grease on the inside of the wheel, your CV axle boot or CV joints may be worn out and should be inspected for damage or tearing. Other signs of a failing CV shaft include clicking or popping when turning, a side-to-side shake during acceleration, or looseness felt when manually inspecting the CV shaft. If you need to replace one or both of the CV shafts on your vehicle, shop O'Reilly Auto Parts for the replacement CV shafts, hub assemblies, seals, and other parts and tools you might need to get the job done right.