All of it. The 10 percent figure you occasionally see is nonsense that a lot of people believe just because they've seen it so much.
Quick Answer. Some things that cause a vehicle's front end to make a clunking noise are worn ball joints, a damaged tie rod, broken or loose sway-bar links, hard or damaged shocks, and faulty shock mounts. An automotive professional can inspect the vehicle's front end to locate the source of the clunk. Continue Reading.
Less scary old car noises include things rubbing on a slightly warped CV boot or axle, and scraping sounds can be caused by tires that are too big for the wheel wells, or wheel wells that have sustained damage in an accident and are now in the way of the tires at the maximum turning radius.