For you to prove that your axle is bad, try to figure out the following symptoms: A buzzing sound Although a buzzing sound may result from inadequate grease, it can also be the sound of a bad wheel. If you hear the sound of a cluck when you accelerate, slow down, or shift gear To be sure about this, put the ATV in reverse mode, and then vary it up and down. If the noise gets louder, then you ought to replace your axle. Hearing a popping or clicking noise when turning To confirm this, put your machine in reserve mode, switch all the handlebars one way, drive in a circle, and the axle is bad if the noise gets louder. Vibration on Acceleration Although the inner or outer joints’ movement can cause this, it is usually an indication of a worn-out inner joint.