hello i'm Matt. i have a 2002 f-250 lariat 4X4 CCab. mine vibrates like that. Starts around 55-60on up to about 68mph. Mine seems to make louder noise when i let off slowly though. I have replaced the u-joints twice and replaced the carrier bearing. just really seems like and out of balanced drive shaft. i have had a lot of trucks and never had an out of balance drive shaft. i will take any advice. also have hubs that wont work by the switch and a clunking in the front end when off-road. any help please. thanks everyone for your information. very helpful.