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I had this happen to me also. The problem was related to driveshaft vibration and a poor tailshaft housing design. At first I had the tailshaft bearing replaced and used locktite to hold it in place. The bearing held up, however there was a slight vibration at 68MPH (since new) and a big vibration over 88MPH (since new).
I had the driveshaft replaced and the high speed (over 88MPH) vibration went away, as the balance and driveshaft design were much improved. However the 68MPH slight vibe was still there. Ford replaced the tailshaft housing with an updated and stronger design, the vibration is gone.
Many miles later I had a tranny failure and the replacement tranny has the older style of tailshaft housing. The 68MPH vibration is back.
Chris
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