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.
Loose trim/body items are responsible for a lot of auto noises. If the rattle just started after putting on the summer tires, check for loose wheel covers. Check wheel well plastic liners and underbody panels, especially those connected to the lower edge of the front bumper cover.