Transmission issue

[sageleiz]

Bought the car a few days ago and transmission is making an odd noise. It starts in a random gear and will continue throughout the gears even in neutral,It doesn’t go away with pushing in the clutch either. I got a okay video but it sounds similar to coins in a dryer. I added fluid but the sound continued. It doesn’t pop out of gear or struggle to get in gear. It is also accompanied by a thud when it gets into gear far into the rear and you can see the back of the car jump from the outside. Does anyone know what this is? I have a video but i don’t know how to attach it.

[itsa300zx]

I wonder if the center carrier bearing for the drive shaft is broken.