I'm having the same issue with my transfer case. My Indy filled it with new fluid two days ago, but I still hear a whine. I think I've only put about 70 miles on it since then though. I guess I should wait till I have about 1k on it like yours. Has yours gotten any better? Oddly enough, mine started right after I got new winter tires 2 weeks ago. It's a square setup though.