I recently fixed a similar continuous vibration problem in my 2004 (4X4) Expedition. For about 2 years I had noticed a vibration that would start at about 40 mph and would get progressively worse over 40 mph. So I replaced both u joints of the rear drive shaft but no difference. Then I replaced...
2004 XLT / 5.4L (2 valve) / 3.73 Rear Axle Ratio / (4X4 w/AdvanceTrac) / Heavy Duty Towing / Dual Air-Conditioning
Mileage: 388,703
These vehicles will last several years as long as their required maintenance is kept up (i.e., engine & transmission oil & filter changes, engine coolant change...
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