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.
One of the prime reasons for whining noise may be friction caused in the car transmission mechanism. The reasons for this might be worn out gears and low transmission fluid levels. You could check whether the problem is in the transmission in the following way. Accelerate the car to speeds at which the whining noise is the loudest, switch to neutral gear and kill the engine. If the noise still persists, then the problem lies somewhere in the drivetrain or transmission.