For those of you suffering from the 1500 rpm vibration (not moving) and 45-75mph driveline vibrations take a look at this link to see what Ford Engineers did to the 2003 expedition regarding vibration.

Here are several notes rom the review:

They redesigned the 5.4 block, designed new hydraulic engine mounts, re-tuned the intake and exhaust systems, changed the mfg. process of the drive shaft (friction welded now, seamless), stiffened the exhaust manifolds, introduced a flexible coupling between the engine manifold and exhaust, re-located ehaust hangers to resonance dead zones, added a second resonator to the exhaust system, introduced new metal and plastic laminated oil pans, and make use of a hydorformed frame.

http://www.fordtruckworld.com/news/2003expy-powertrain.asp

It would be nice if some of these improvements could be incorporated into my 98 F150 SC SWB 4x4, 3.55LS, 9.75. I already called about 2003 F150 engine mounts, unfortuantely the part number is the same as that for my 98. So, I'm not sure if anything at all was done to improve the 2003 F150, probably not, since it is due for a complete re-design in the next year or two.

 

I HAVE THE SAME VIBRATION, MY 2000 F150, FORD REPLACED HARMONIC BAL, DRIVESHAFT, TORQUE CONV, AND REBALL TIRES. ITS A LITTLE BETTER BUT IS STILL THERE.AND FORD SAID, ITS A TRUCK. NOT A BMW, AND I SAID AND THIS IS QUALITY!!!!