Thought I’d share a slight vibration re my 2001 F-150, 4.6 L Automatic, 101,000 miles.
Removed the driveshaft and found the tail shaft housing bushing/bearing to be worn allowing the driveshaft to wobble. I replaced the bushing/bearing and seal. This alleviated the vibration.
Make sure you check the yoke that slides into the transmission, the part that rides on the bushing/bearing, for abnormal wear.

Please post your findings.

"Make sure you check the yoke that slides into the transmission, the part that rides on the bushing/bearing, for abnormal wear.

Please post your findings"

What, you want me to do this now?