If you are hearing a "clicking" or "clunking" sound coming from under your car there is a good chance your CV joints are starting to go bad. CV (constant velocity) joints are responsible for providing a direct link between the axles and the wheels. They allow the power to be distributed evenly throughout varying degrees of rotation and can fail. One of things you can do to prevent their failure is to inspect the boots that cover the joints and make sure they are not ripped or torn. CV joints should be disassembled, inspected and repacked in the appropriate grease as needed.