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.
Engine and Transmission Mounts. Engine and transmission mounts are an often overlooked cause of engine noise and vibration. A loose or broken motor mount that allows excessive engine movement may allow a belt-driven fan to hit the fan shroud, or the fan to hit the radiator hoses.he rear mount may be part of a bolt-in crossmember support. On front-wheel drive (FWD) cars and minivans with transverse mounted engines, there are left and right engine/transmission mounts, and a third mount above or below to triangulate support.