Horrible Sound Diagnosis

Hey Everybody. I'm a newb to the ATV world - bought my (2003) Grizzly last fall - she's an old girl, and I love her something fierce. Gotta get her back into service asap! She's got an awful whine 100% of the time she moves... other than that, she runs great! I've posted a video on YouTube where you can here this God awful sound clearly... if you wanna cut to the chase, it happens @ 3:30. The front half of the vid talks about what I've done so far, thereby knowing what it ain't... your experience / input is GREATLY appreciated!! Vid link: