CV Joint Buying Guide

Types of CV joint

Outer CV joints are the classic ball-and-groove design (Rzeppa type) that handles the high steering angles at the wheel hub. Inner CV joints, which connect the shaft to the differential, use a tripod or plunging tulip design that accommodates up-and-down suspension travel as well as rotation. Both types live inside a rubber boot filled with grease.

On rear-wheel-drive vehicles with independent rear suspension, CV joints are also used at the rear. Four-wheel-drive vehicles use them at all four corners, making CV joint maintenance an important part of running a 4×4.

Diagnosing CV joint failure

The classic symptom is a clicking or crunching sound on tight turns, most noticeable in carparks or when reversing in a slow arc. The noise is caused by the hardened steel balls running in worn grooves in the joint body. As wear progresses the noise appears at wider steering angles and eventually at straight-ahead driving, indicating the joint is close to complete failure.

A torn CV boot is the most common cause of premature CV joint failure. Once the boot splits, the grease is thrown out and contaminated with water and road grit. Replacing a torn boot promptly, before the joint itself is contaminated, can save the expense of a full joint replacement.

• Clicking on tight turns — outer CV joint
• Vibration at speed — inner CV joint
• Torn or split CV boot (causes rapid contamination)
• Grease thrown onto the inside of the wheel
• Clunking under load during acceleration

Replacement options

CV joints are available individually or as part of a complete drive shaft assembly. Where wear is limited to one joint, replacing the joint alone with a boot and grease kit is cost-effective. If the shaft itself is bent, corroded, or the inner joint is also worn, a complete driveshaft exchange unit is often the practical choice. Use the registration lookup to confirm the correct part for your vehicle and axle position.

Frequently Asked Questions