few months back my left side rear axle broke and the car wouldnt move. so i thought it was the diff but come to find out the rear driver side axle was broken i replaced the axle with a used one and everything was fine for few months until 2 days ago my axle went again. i took the axle to a shop where they rebuild the whole axle. the car drove fine and suddenly the next day in the morning the axle broke again. i dont know whats going on? what causing this problem! any suggestions guys?