Dump truck shaking, only when loaded

Two different trucks there. The first one is totally messed up. The hanger - carrier bearing should be on the shaft - shafts in front the rear driveshaft. Rear shaft has to have the slip yoke. So what is the real deal?

 

It's impossible to properly diagnose your issues from behind a keyboard. You'll have to go through a slow physical process of elimination and you'll probably find several issues along your journey. Here's a good flowchart to help guide you...

https://assets.wellertruck.com/refe...stics-checklist-flow-chart-rrmt-0002-2004.pdf

 

Excuse me as I struggle with my little screen. Front shaft - rear shaft OK. 201 mentioned a bad joint. I worked at a shop that had a truck with a vibration problem. They spent a lot of money on it. After about 3 or 6 months a U joint was replaced and the problem was solved. They may not have slack but if one trunion is not wanting to rotate freely it can cause vibration. You could probably catch it with one of the new heat guns these days.

 

We got one in the shop once that had a really bad shake like what you are describing. It had a bent driveshaft. You couldn't tell by eyeballing it but if you put a jack stand right next to the middle of it and spun it you could see almost a 1/2 inch wobble to it. Just something else you might check.

 

I do not thank driveshaft balance cares about loaded or empty. Knock the axle shafts out. High gear wide open, with a load on it, does it vibrate? Just open discussion. Beat me up.