Subaru Forester CV Axle Shaft

What is a CV axle shaft?

Most front-wheel drive automobiles, many all-wheel drive vehicles, and some rear-wheel drive vehicles all have CV joints. A CV joint is a joint made with the least amount of internal play and friction possible to transmit consistent power through a wide variety of angles. Two CV joints are located on either end of a CV shaft, which enables the front wheels to turn left and right and the suspension to flex over bumps as the vehicle is being pushed ahead. Vehicles with two-wheel drive have two CV shafts, whereas those with all four-wheel drive might have up to four CV shafts. 

A CV axle shaft works by transferring power from the vehicle's transmission to the wheels while accommodating changes in wheel position and suspension movement without causing power loss or mechanical binding. 

What are CV axle failure symptoms?

The following signs of a bad CV axle will let you know if you need to repair or replace your CV axle shaft： 

• Grease on the inside or edge of the tires
• Vibration while driving 
• “Clicking” noises when turning
• A knocking sound  

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