CV Axle (CV Joint / Half Shaft)

Transfers rotational power from the transmission or differential to the drive wheels while accommodating the up-and-down motion of the suspension and the turning motion of the steering.

$200 – $600 per axle

Total Cost

As needed (typically 100,000 – 200,000 miles)

Replace Interval

Hard

DIY Difficulty

Fix Within a Week

If It Fails

Overview

CV (Constant Velocity) axles transfer power from the transmission to the wheels while allowing for suspension travel and steering movement. They contain CV joints protected by rubber boots filled with grease.

Parts Cost

$60 – $250 per axle

Labor Cost

$100 – $250 per axle

Failure Symptoms

Clicking or popping noise when turning

Moderate

Vibration while driving

Moderate

Grease splattered on inner wheel well

Moderate

Torn CV boot visible during inspection

Moderate

Clunking when shifting from Drive to Reverse

Moderate

Knocking noise while driving straight

High

Warning Signs to Watch

Clicking noise when making turns (especially tight turns)
Grease visible on inner fender or wheel
Visible crack or tear in the rubber CV boot
Vibration that increases with speed

Common Causes of Failure

1CV boot cracking or tearing (most common — allows grease out and dirt in)
2Normal wear at high mileage
3Road debris damaging the boot
4Impact from potholes or road hazards
5Driving with a torn boot until the joint fails

Prevention Tips

Inspect CV boots at every oil change — catching a torn boot early saves the joint
Replacing just the boot ($100-$200) is much cheaper than replacing the whole axle ($300-$600)
Avoid full-lock turns at high speed — this stresses the outer CV joint

When to Replace

Replace the axle if the CV joint is clicking (worn). If only the boot is torn but the joint is still quiet, you may be able to replace just the boot to save the joint.