Thanks, folks. I did find CMS when Googling, but I wasn't sure about their reputation.
It looks like I might have a line on a used trans from someone on another forum, so
TBD on that.
By the way, I made a post yesterday about the steps I took to investigate the noise, but it never got posted for some reason. In any case, removing the accessory belt was the first thing I did. And, as I said, there is zero noise with the clutch in. It's 100% a transmission issue.