What is a CV axle / shaft replacement?

For this service, an auto professional will investigate your vehicle's wheel for signs of a faulty CV axle then replace one if necessary. CV axles are usually replaced for the following reasons: 
  • Mileage
  • Environmental factors (road salt)
  • General wear
A worn CV axle is usually the result of a ruptured CV boot—a rubber, accordion-shaped structure that protects the axle from water and dirt. If the CV boot breaks, abrasive substances will begin to take their toll on the axle and you’ll need to replace the entire part.

How to replace a CV axle / shaft assembly 

Because it involves precise mechanical work in your vehicle's wheel well, replacing a CV axle is a job best left to a professional. This service is made up of the following steps:
  • Investigate to confirm the axle requires replacement
  • Remove the wheel
  • Add the replacement
  • Torque all wheels and fasteners to factory standard
  • Top of lost transmission fluid
  • Check the tire pressure
  • Conduct a road test
A faulty CV axle can also damage your wheel’s bearing hub if you live in a climate with a lot of road salt. This will require additional labor and parts.

When do I need to replace my CV axle / shaft? 

Driving on a worn axle is feasible for a short period—but if you notice problems with your CV axle, you should have your car looked at by a professional as soon as possible. Otherwise, you risk being unable to drive your vehicle.
Here are some common symptoms of a worn/damaged CV axle:
  • A clicking sound when turning
  • Heavy, black grease forming inside your wheel or on the ground
  • Vibrations when driving highway speeds
Your car may have multiple axles, but you’ll usually only need to replace one since the usual suspect is a ruptured boot. 

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