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.
Rattles from beneath the vehicle: It could be a loose exhaust system or even loose brake pads. Roaring that increases with acceleration: The first thing to check is the exhaust system; it could be damaged. Transmission issues could be another cause. In an automatic, perhaps it's not advancing to the next gear.