From both my rear diff and my t-case (at the tailend). I'll check it again when I get home, but the shaft doesn't seem to have any play in it. Can't tell specifically where, either. The diff has the underside of the tubes, as well as the pumpkin.
The t-case seems to be the bottom half of the t-case.
Ideas? I thought originally maybe the pinion seal/SYE seal, but not sure.