So, if you read through the threads you'll find out that the gear oil of choice is Torco. And their additive too. Well I decided to test that theory. This car isnt my only vehicle so if my theory was incorrect, I'll just order some Torco and change it out. I went to walmart. Bought the cheapest synthetic gear lube they had (which actually tested out what and what with redline) and to add to it, I used the thinner variety being 75w90. I then went to oreilly and bought some Lubegard additive. Added half the 4oz bottle and then filled the gear oil up. Drove around for about three hours. I made circles, u turns, cruising and a bunch of full throttle hits. The diff is quieter than it was. It used to make a slight whine at a certain speed although you really had to listen for it. Now its dead quiet. Its going on an out of state trip this weekend. If I end up having any issues, I'll report back. But so far, its perfectly silent and both wheels spin like they should.