New true-trac differential whine

Dr Diff does not sell them anymore, he sells a different one now. I asked what the issue was since I have one of the original ones and was concerned that mine would have the problem. So the answer was that some of them had poor machining tolerances. If yours is bad it would be obvious right from the start. Luckily I have had no issues with mine. I just bought the new one he sells and man its a nice looking piece.
"Due to inconsistent quality issues, I no longer carry the 8.75" True Trac. Please consider the 6 helical gear Sure-Trac"
It may not be your problem but its something worth checking out. The symptom is whining.