Ok, lets go further with the questioning. Did you mark all the yokes/shafts in their original order? Rotating them 180 degrees could send the driveshaft out of phase.
Where there any shims/washers for the center support? If that shaft angle is off you could get a vibration. When it "locked up", did the bearing spin inside the carrier support?
$800 is bit steep for a ujoint/bearing/balance job - especially since you already put those parts in. But that's just me. We are trying to figure out if your vibration is coming from the shaft or something else in the setup (shaft angles, etc). I asked about the trans mount as this would also cause a vibration since the tail of the trans would be moving slightly and throwing off your drive angle.
The side to side adjustment is also in question. You could move it and see if the vibration changes. Not sure if you have room to run a string from trans tail to rear end to see how far off the center support is. Not a great test by any means...just helps give a visual. Similar to how the poor man's wheel alignment was done back in the day. Post some pics of your driveshaft/setup if you have any.
When the bearing locked up, the rubber piece came out causing the driveshaft to flop. All happened at interstate speeds of 75. The shim from the factory is there for the carrier bearing. I will double check the transmission mount. I am not near the truck and won’t be until I return home from working in 2 weeks.
I will also add that I am replacing the transmission. Nobody will touch it since it’s a manual and I do not trust myself to dive into a transmission rebuild. So I purchased a reman to put in. It’s pretty much toast and near to the grenading stage.
When I replaced the u joints, I did pay close attention to how the shafts were aligned to put back together as so. I however did find a sticking u joint in the process of doing all of them. It definitely helped, but the vibration is still there at 40mph. I even took to the tire shop to have the tires checked for balancing. One tire was 1oz and the rest were fine/ no additional weight needed. Leave the shop and no change in vibration.
I do not know what transmission vibration feels like as I have never experienced it. If it was the trans, would it be doing it all the time or maybe just certain speeds? Just a theory I thought of. But I still am leaning towards the drive shaft getting out of wack when I limped it home after the carrier came out. I have a self-service salvage near my house. I may go try and scope one out to try when I return home.