What is the mileage on the expedition? My ball joints were worn out around 100 thousand miles and would squeak and creak over bumps, sway bar links did the same thing. If the squeak occurs from bumps only and not smooth road driving I would check everything in the front end. Ball joints, sway bar links, tie rod ends, all of the main wear items in the front end. if you hear squeaking on smooth road then check brakes. The clicking around turns is probably the cv axle half shafts. If the boot is intact you can generally expect 120k-200k from a half ton Ford front axle, depending on driving conditions. If the rubber boot rips it will probably be making clicking noise while turning within 1000 miles. If your expedition has over or close to 200 thousand miles it could also be that one or more of the wheel hubs is worn to the point where it will creak or squeak over uneven pavement.