Troubleshooting rattle (or something) sound at rear end of 2009 RZR 800 S

I'm racking my brain trying to figure out what is making the noise in the rear end of RZR. Is it the Diff? Maybe it's the pinion nut in the differential? Is it one of the CV joints/axles?
What do you think?
Left Side 0:56
Right Side 2:55

[@Randomalia]

Left Side starts at 0:26

[@DaveGoldstein-ud2tw]

What was it?

[@Randomalia]

Never could really tell. I change out one of the CV axles and all of the bushings......but can't remember now how much difference it made. I ended up selling it about 6 months ago. But....it ran fine and did all the stuff it needed to do.

[@DaveGoldstein-ud2tw]

@@Randomalia Thanks for replying. I am looking at these but reading about loose pinon nut had me wondering.