OK. i just tested it.. kinda. I think this confirms it is infact working.
Jacked up pass front only and rotated tire in both directions, clicking could be heard from the front differential. Did the same for the other side, same
I jacked up all 4 corners of the xj and put it on jackstands. I put it in 4 hi and in drive. Rear with the trashed trash lock I could stop one of the tires easily with my hand and the other side continued to rotate. (open differential)
with the front I tried the same, but I could not stop the tire at all on either side by hand. no wierd clicking was heard while in 4wd
i *think this means it is infact working, and just quieted down on the street.