What is a CV axle shaft?
CV stands for constant velocity. The CV axle shaft is part of the CV axle assembly, which also includes CV joints and CV boots. Together, these form part of your car’s drivetrain that delivers power from the transmission to the wheels. CV axle assemblies are usually used in front-wheel drive vehicles, but they’re also on all-wheel drive vehicles.
If you look more closely at the CV axle assembly, you will spot a shaft that connects a CV joint on each end. The joints let the shafts rotate freely. You can probably guess that a failing CV axle is a big problem!
When should I replace the CV axle on my car?
Here are some of the most common symptoms of a bad CV axle:
Clicking noises when turning: Some drivers describe the sound as a loud pop. These noises mean the joints are loose on the shaft.
Knocking or clunking sounds: This might sound rhythmic or be more noticeable when you put your vehicle in reverse.
Grease on the inside or rim of the tires: The CV boots have grease that keeps the axle shaft lubricated, but if they’re leaking, the CV shaft could fail.
Vibration while you drive: This is a vague sign, but if the vibration is strong, gets worse the faster you drive or makes driving feel bouncy, the problem might come from the CV axle shaft.
Keep in mind: If you hear any unusual noises coming from your wheels, get your CV axle assembly checked right away.
How often should a CV axle shaft be replaced?
CV axle shafts typically last a long time—we’re talking 70,000 to 140,000 miles. Driving conditions can affect the lifespan. If you drive on rough roads or off-road terrain, the CV axle will wear out faster.
Can I replace my CV axle myself?
Working on the CV axle assembly takes advanced auto repair skills, so it’s best to leave the replacement to the automotive professionals. Plus, they’ll already have all the specialized tools and equipment to do the job.
Tip: If your car is still under warranty, check to see if the manufacturer will cover the cost of replacing the CV axle shaft.