I do have low speed and low load clunking to which you refer. This, however is not the only time clunking is an issue. You do mention this as a last resort after mechanical issues have been resolved, which is where I'm at now.
I believe my whine and clunk are from the diff. The moan is something I can't find any info on. It's curious that the last 2 used diffs I've installed have the same 3 noises. Could I be that unlucky?