If you ever have the opportunity to drive a M35 with the bed removed. You will be amazed at how much the axles move side to side while just going straight. They move a lot. The dog bones keep them all connected. They are basically made just like the ball joints on modern cars. Metal stud in a big rubber type enclosure. That rubber will dry out and break eventually.
I used my Gasser M35 with a M105A2 attached to pick up some gravel for the drive way a few years ago. They severely over loaded me. I was at 38,300 leaving the gravel pit. 24,000 pound load between the truck and trailer. I threw a fit but they wouldn't and really couldn't get it back out with the equipment we had on hand. I drove very slow the few miles to home.
About a month later I was driving the truck home at night empty. The Gasser is a blast if you have a slight down hill to help wind the engine out in the gears. I was doing that and noticed a bunch of smoke in my mirror as I went past street lights. It drove and handled just fine but I slowed down and went on home trying to think through what could be smoking.
I had a broken dog bone end and one of the axles had moved to where the tire was rubbing the frame. Didn't hear it, feel it or see it as I walked around the truck to drive away. Crawl under the truck and check. A prybar to lightly check for movement is also a good idea.
