Welcome to JustAnswer, I'm Neal and I am here to assist you. Please feel free to ask follow up questions, it is part of the process.
First here is some Important info on the propeller shaft so we can be on the same page as far as terms.
I will jack up the car and check all of this out.
Looks like I have up and down play where the bearing bracket is. Also I can twist the drive shaft about a 1/4 inch at the transmisson.
Could the bearing bracket cause the vibiration?
The play in the trans as far as rotating the shaft is normal.
The play at the bearing/ bracket should be the issue. Imagine that moving up and down under a load as the driveshaft turns.
I will replace it and give it a try!