Excessive vibration is an early sign of a bad CV axle. Although, you cannot attribute all vibrations to a bad CV axle. Many issues might cause CV axle vibrations when driving. The sooner you address that, the lesser the damage to your car. Another symptom is the wobbling of the entire axle system, resulting in loud banging or growling noises. If you hear a lot of grunting, it's probably coming from your CV joint or axle. A bouncy or jerky vehicle could also mean bad CV axle symptoms. A damaged CV boot resulting in oil leakage along the wheels is another sign of a damaged CV axle/joint.