Trying to confirm bad ujoints

[Anthrax]

Excuse my lack of knowledge but still learning as I go. I have what I think are failing ujoints and I'm just trying to confirm that. I have a rattle which sounds like it's coming from underneath towards the rear. Almost sounds like something bouncing around in a tin can. Seems to go away at high speeds (or maybe I cant hear it idk). I checked them and didnt see any play but I also know that doesnt rule it out.

Thanks

 

[alumarine]

That doesn't really sound like ujoints.
Sounds more like something loose under there.

When ujoints go out you feel a vibration.