Mazda 323F 1999 1.5L Rattle under light load...Maybe differential?

Hey,

relatively new to this forum. Just watching out overall how to solve this issue.
I have a rattle sound when accelerating slightly, shifting up and accelerating or just that with shifting down.
When having the car on jacks, sometimes it seems when wheel 1 is turning at full speed in 2nd gear or whatever, the other wheel wants to push to the same speed.
Sounds normal to me but that "push" causes rattle sounds sometimes.

I did a video about it, might help a ton. That sound doesn't seem to be toooooooooooo dangerous for the car. I think I have it for quite some time but recently its getting worse I assume. Sometimes the rattle comes at full acceleration as well but mostly its noticable on light gas blips.

Very annoying overall and not happening in neutral even if I roll the car so it seems that it only happens under certain load.

Any idea?

Both videos: Driving around with rattle noises under slight accel

thanks!
 
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