What to know about the Axle/CV Shaft Assembly:
Axle shafts are commonly known as “CV axles” or “half-shafts.” An axle shaft is a narrow, pole-like part that connects a wheel to the gears in the transmission. Axles are part of the system that enables the wheels to spin. One end of the axle shaft is connected to the transmission and the other end is connected to the wheel. The transmission turns the axle shafts, which turns the wheels. Without the axles, the tires will not rotate and the car will not move.
Axle shafts are made up of four parts: shaft, CV joints, grease and the boots (grease container). The most common reason for the axle to fail is because of the torn boots (grease leaking out). Without the grease, the CV joints will not get lubricated, dirt will enter the joint and the whole axle will eventually wear out.
Facts to Note:
Your car has multiple axle shafts, but in most cases only one will need to be changed.
Even if the CV joints or boots are the only parts of the axle to fail, it is often recommended to change the entire axle.
How to Fix:
Confirm the axle shaft needs to be changed.
Remove wheel and change faulty axle.
Torque all fasteners and wheels to factory specifications.
Check tire pressure.
Perform road test.
Every time you have a major service, the mechanic should perform a basic safety inspection that includes a visual inspection of the axles and boots. If there is grease found around the tires, it is likely that CV boots are leaking. Also, if you hear a loud clicking noise when you make a turn, it can mean that the axles are not good and need replacement.
Common symptoms indicating you may need to change the Axle/CV Shaft Assembly:
Loud clicking noise in front or rear of the car when making a turn.
You may observe grease on the inner edges of the tires.
Vibration when driving.
Importanceof this service:
Axle shafts link your transmission to your wheels. When you step on the gas pedal, the transmission gears turn the axle shafts, which then turn the wheels. Broken axle shafts will not rotate, and there will be no connection between your transmission and your wheels; as a result, your wheels will not move.