Axles are a vital link in the power train, delivering engine power straight to the wheel hubs. Modern axle assemblies feature multiple components in order to deliver power to the ground smoothly and reliably. These components include the axle shaft, inner and outer constant velocity (CV) joints, CV boots, clamps, and others. When an axle assembly is bad, you will often hear or feel a vibration or clicking sound, as the bearings in the CV no longer make a seamless fit and rotate smoothly. If this is replicable when going around a corner, the bad axle will be located on the UNLOADED side.