transmission or transfer case rattle/ chatter, cant identify.

[1991 Blue danger ranger]

I've been dealing with a rattle/ chatter noise from directly under my transmission tunnel, just behind the shifter. its in every gear except for fourth, and in 2 hi 4 hi and 4lo. i just replaced the transfer case today after i thought i had determined the source of the noise being it. i also previously replaced the driveshaft, also to no effect. anyone have any idea what? i seriously doubt my transmission as it doesn't even have 15k kms on it. TIA
https://youtube.com/shorts/f2HXamnkKi8 this shows it.

'91 4.0 electric 4x4 5 speed manual.

 

[NakedDucks]

2 quick checks before you remove the trans… bellhosing bolts and fluid level. If both are good, it’s gonna be one of 5 things, and unfortunately all 5 checks require the trans to come out. Once you figure it out, replace the slave, or you will lose fluid from now on.

-pilot bearing
-throw out bearing
-input shaft bearing
-clutch
-pocket bearing between the input and main shaft (requires trans teardown)