Q&A

I don't know for sure on checking all of the u joints. I'm going by what he said and not by my experience. Yes the truck is a 4x4 also. What would the cost be to replace ALL of the U joints???? I don't have any tools to fix it myself. What else should I be looking at on the driveline to eliminate the noise. Oh, I have never heard any popping or clunking noises. Just the vibration only.

You are correct wetry. There is a bad u-joint somewhere.
My suggestion is replace all the joints.

Exactly, that is the only way to fix it! Just because a u-joint is good and tight does not mean it is good. Usually a gaulded joint is accompanied by popping and/or squeaking when accelerating followed by excessive vibration at road speed.
This is assuming all other sources of vibration have been investigated and ruled out!

What would the cost be to replace ALL of the U joints???? I don't have any tools to fix it myself.

Take the truck to a repair shop have them pull the rear drive shaft out and check to see if the u-joints are DRY and gaulded.
Replace all the joints in that shaft if defective.