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.
When the track bar is loose, it will cause a vibration but also a noticeable sound. This is caused by the support brackets and bushings moving while the vehicle is steering or in forward motion. The noise under the vehicle will be amplified when you drive slow or over speed bumps, driveways or other bumps in the road.