Why is my driveshaft rubbing

[Drock]

When I bought my 66 Coronet I noticed that when I let on and off the gas I would get a little thump and some rubbing sounds, First time I got it on the lift I noticed I did indeed have some rubbing spots right under the console up near the, u joint it's from the larger portion of the drive shaft.

Well now after romping around on it has gotten worse, it use to only be super noticeable at speed above ~55 now I'm starting to notice it at closer to 40 and its getting louder. I have a feeling I need new U joints etc. The question would be if I'm going to drop the axel a start servicing components what all I should go ahead and replace?

Attached are some videos from under the car and what it sounds like inside.
Thanks in advance.

https://www.youtube.com/embed/a6ZlpLt3ilM
https://www.youtube.com/embed/8boqQKUj3j8
https://www.youtube.com/embed/vlWvgizmrxU

 

[5.7 hemi]

Check your rubber mount.

 

[Mike67]

Sounds like your trans mount is busted like 5.7 stated...or the bolts have fallen out...

 

[WileERobby]

Also check your engine mounts and brackets, if the engine is "sitting" in its perch correctly, if either is loose, or either is bent.

 

[snakeoil24]

Your going to need new U joints as well and check to see if shaft is still true with a straight edge at least a 2 foot straight edge.

 

[Drock]

I got it back up on the lift, it looks like the clips on the front U-joint are gone, and so is the rubber boot around the back of bearings. Also, the transmission rubber mount is in good shape and tranny is not loose.

I have been looking for the best U-joints that meet these specs:
Bearing Cap Diameter Axis 1 (in): 1.078
Bearing Cap Diameter Axis 2 (in): 1.078
Length Between Inside Snap Rings Axis 1 (in): 2.125
Length Between Inside Snap Rings Axis 2 (in): 2.125

I'm considering these:
http://www.fme-cat.com/overlays/part-detail.aspx?brandId=MU&pNum=246&partType=U-joint

or
http://www.fme-cat.com/overlays/part-detail.aspx?brandId=MU&pNum=315G&partType=Driveline

or

https://www.amazon.com/gp/product/B00DOH33JQ/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1

Lakewood 23010 (i can't find these in stock anywhere)

Any suggestions?

 

[Drock]

Check your rubber mount.

Thanks, rubber mount is good tranny is not loose from it..

 

[Drock]

Sounds like your trans mount is busted like 5.7 stated...or the bolts have fallen out...

thanks, its in good shape.

 

[Drock]

Your going to need new U joints as well and check to see if shaft is still true with a straight edge at least a 2 foot straight edge.

shaft is true, u joints are toasted