What Is a CV Joint and Why It Matters

If you've ever wondered what makes your car's wheels turn smoothly as you steer and drive, you're likely thinking about the CV joint, or constant velocity joint. It’s a vital component of your vehicle's drivetrain, especially in front-wheel drive and all-wheel drive vehicles.

What Is a CV Joint?

A CV joint is a mechanical coupling that allows power to be transmitted through a variable angle, at constant rotational speed, without an increase in friction. It’s typically located at the ends of the axle shafts—connecting the transmission to the wheels. There are two main types: outer CV joints (near the wheels) and inner CV joints (closer to the transmission).

Why Are CV Joints Important?

CV joints keep your ride smooth and stable by allowing the front wheels to receive power while also turning left and right. Without them, your car would struggle to transfer power efficiently while steering or handling uneven road surfaces.

Common Signs of CV Joint Failure

• Clicking or popping noises when turning
• Grease around the tire edge (due to a torn CV boot)
• Vibration during acceleration
• Knocking sounds from underneath the vehicle

If you notice any of these symptoms, it’s essential to inspect or replace your CV joint immediately to avoid further damage or loss of control.

How Long Do CV Joints Last?

With proper maintenance, CV joints can last over 100,000 miles. However, once the protective rubber boot cracks or tears, dirt and moisture can damage the joint quickly.

When to Replace a CV Joint

If your mechanic confirms wear or damage, replacing the CV joint or the entire axle assembly may be necessary. TLM Auto Parts carries high-quality CV joints and related components for all major makes and models.