Vibration in OD

Raddii

"The Dancin' Bear"
1999 Ford Lightning #0073 : 50,000 miles.

I had the Ford dealer reverse flush and re-service the transmission. Since then; between 50 and 70 mph there is a medium frequency oscillating vibration in OD only.

Kick off OD and vibration goes away. Dealer has changed rear-end clutch pack and both universals. Problem remains.

What are your thoughts regarding this problem?
 
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