What is a CV joint?

On front-wheel drive vehicles, the axle shafts connect the wheels and the transmission. The axles flex, allowing the car’s front wheels to turn left and right plus up and down. A Constant Velocity (or CV) joint allows the axle shafts to flex while simultaneously transmitting driving force from the engine to the wheels.

The CV joint is covered by a protective boot. The CV boot shields the joint from dirt, stones, dust and other contaminants that your car may attract while driving.

Your CV joint acts as a direct link between your engine and wheels. Because of this, the joint will be subject to powerful forces. Over time, these forces will cause your CV joint to wear out. Once the joint wears out, it will need replacing.

The CV boot will need replacing if it cracks. This is because it will allow the CV Joint grease to come out of the joint. A split CV Joint boot also exposes key components of the joint such as the CV joint bearings and inner race, putting them at risk of damage by dirt, stones and dust wearing them out quickly.

Your vehicle’s axle, CV joint, and driveshaft components are integral to the performance and drivability of your vehicle. The driveshaft is a steel or aluminum cylindrical component that connects the transmission to the rear differential.

The driveshaft connects to the transmission through the CV joints, which are responsible for transferring the torque from the transmission to the drive wheels at a constant speed. Front wheel drive vehicles use CV joints on the front axles. CV joints allow the axle to bend and change while accommodating the bounce of the wheels.

The axle bears the weight of the vehicle while also being strong enough to sustain the forces from braking and accelerating. Over time and through normal use, your vehicle’s axle, CV joint, and driveshaft components may require maintenance or replacement services.

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