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.
Noises are just part of operating a vehicle. Tire treads hum against the asphalt, wind whistles as it passes around outboard mirrors, plastic bits and pieces in the dashboard generate little squeaks as they rub together and so forth. Most of us don't even notice these harmless notes after a while.