1956 Chevy 4400 - Help with Dump Bed

[Greasemnky]

I picked up a nice 4400 Dump truck for around the farm. A minor tune up, and new brake lines, and we have her driving and stopping.

I have a question though, the PTO to the dump SEEMS to work, but the driveshaft bangs around violently. It seems like an odd design to me, a short driveshaft suspended in mid air by 2 U joints. Am I missing any parts in this set up? The driveshaft off the motor just passes thru a piece of pipe bolted to a cross member. Should there be a bearing in there?

Thank you so much for the help! Trying to get it back to work where it belongs!

https://drive.google.com/open?id=1cpkCRJZ9-1ACtJr3UhDC29ZH46q_ldnn
https://drive.google.com/open?id=1chGJHcwio_J3ZA-yEhLcPaXa0bVwKFwM
https://drive.google.com/open?id=1cgzJsIew-UKqPPtpH5Dg26JMnNo7_Gbr
https://drive.google.com/open?id=1kQIYjYgsRe_VllSBAKIrCQ1yLvdpRVaD

Videos
https://drive.google.com/open?id=1crEyzMNj7I3G01s0PZAjYTdcqMy2QxqT
https://drive.google.com/open?id=1d0XDxv5D-m3S63NTQww-hngG9UG4hFCi

 

[coilover]

That shaft HAS to have some type of center hanger bearing.

 

[Greasemnky]

Any idea what that would look like? The drive shaft is quite large