While driving experienced a vibration an thumping noise from driver side wheel well

SOURCE: Front End noise and vibration

Check the U-joints and axle baerings. But its most likely because the truck is in four wheel drive.

SOURCE: clicking noise from font driver side wheel 4 wheel drive

There is a vacum powered actuator on the front differential housing on the passenger side. It pushes one way for 2WD and the other way for 4WD. If it gets an erratic vacum signal it can cause the clicking as it goes between 2WD and 4WD. It gets it's vacum from two valves mounted on the firewall just behind the battery(to left). The white line feeds manifold vacum to the valves. Check for vacum at white line with engine running. If no vacum there is a break in line from manifold (not likely in this case). If vacum check the pink and blue lines by applying vacum to each one. The vacum should hold. If not check lines from valves to vacum actuator. If both lines hold vacum check valves. Remove electrical connectors from both valves. Connect a wire from one of the terminals of the valve to ground. Touch a wire from the battery + to the other terminal of the valve. Listen for a clicking sound. If no sound valve is bad. Replace valves(s). Also have someone watch position of actuator shaft as you move the selector between 2WD and 4WD. There should be movement. If there is an intermittent problem sometimes it will and other times it won't.

SOURCE: four wheel drive not engaging

Check the front wheel bearings for play and also while the wheel is off the ground lock the front hubs, grab the axle behind the wheel and see if it is engaged. If not then you will need to take the hub apart and find out what is broken.

SOURCE: 2004 ford freestar...I have a VERY high pitch

I had this problem and took it to a dealer. There is a service bulletin on this problem... replace the wheel bearings as they are a known problem. Could be a batch production problem. This fixed my problem.

SOURCE: Car vibrates above 40 MPH

your wheels more than likely needs to be balanced one or more are out of round if you had the tires rotated before the alignment this would make the vibrating more noticible.but balancing should solve your problem.