LT230 grinding noise?

Hi all, at my wit's end and looking for suggestions. I think it's the transfer case, but here's the issue. Recently purchased 92 200Tdi with LT77 and LT230, 98,000 miles. Had a moderately noisy throwout bearing when I bought it so when it stranded me on the highway I assumed it was the clutch (yes, I know). Lowered the transmission and transfer case with no apparent issues, replaced the clutch with heavy duty unit from LOF, and problem persists. Pulled right front hub and found swivel ball full of rust, no grease, rusty bearings, broken CV joint. Replaced both side swivel balls, CVs, etc. Test drive had a grinding/whining noise from what seemed to be the transfer case (this was new). Couldn't shift from H to L. Pulled console again, found missing pin on difflock linkage, replaced, same issue. Shift linkage seems to be binding and maybe transfer case not completely in gear? This time pulled shift mechanism, linkages, diff shift housing, cleaned up, couldn't find any obvious issues, reassemble, H-L shift and diff lock seem to work properly now. Test drive and still same grinding/whining. Videos in attached link where I tried to capture the noise. Low speeds around my driveway. Noise seems to go away when clutch is engaged and especially loud when engine braking. Looking for any suggestions/ideas to look at next. Could the CV joint failing at 60mph somehow have damaged the transfer case? Was in H with no diff-lock of course. According to records, both transmission and transfer case were replaced with reconditioned unit in UK in 2016, about 20,000 miles ago. Appreciate any and all help!

200Tdi noisy transfer case

LOF HD clutches cause all sorts of issues with transfering vibrations into the transmission.
I'm about to take the one out I fitted in August and throw it away before it damages the gearbox/syncro gears.

With the LT230 in neutral does it rattle when you are in gear (especially at idle) ?
Does the rattle dissapear when you press the clutch ?