D100 bell ringing drive line noise help!

[my5thmopar]

Not a Abody but, some of ya'll seem to have some good ideas. Help me out here. My truck is a 64 Utiline with /6 and 3 on the tree (A745) trans. I have had a bell ringing noise since I bought the truck. The truck is torn down now and I didn't get a video while running. It seems to make more noise during coasting. I don't really hear it during acceleration or with clutch in. There was no wood in the bed floor so its possible that it will disappear when the truck goes back together. I would rather fix now if possible. This is a one piece drive shaft and I already checked the drive shaft parking brake. Sorry for the focus but, listen to the noise at about 1 minute in. Thanks Craig

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[my5thmopar]

Got ya stumped? How about a guess?

 

[nm9stheham]

No video, just a picture.

Does this have a drain hole in it? I have had a small gravel get inside a driveshaft with a small hole in it in a race car and I heard it!

Also, check real good for hairline cracks; check all over and around the welds.

Any scrapes on it? Is the rear u-joint good? The pinion angle changes a bit between cruise and coast....Just trying to think what would put impulse noise into it.