I did the Jeep shaft many years ago and the rubber insert in it went bad, causing some extra play in the steering. Probably accelerated the wear by close proximity to the header tubes, but still.. anyway, the tab-looking thing you see captured in the tube there below the u-joint would clunk left and right. Note the difference in position in the two pics here:
You must be registered for see images attach
You must be registered for see images attach
I replaced it with the Borgeson shaft which was a pretty good option at the time but expensive.
You must be registered for see images attach
Both the 3500HD and Cunningham options seem like good routes to investigate. The Borgeson was fine too, just pricey.
Richard