Originally Posted by Kurtis180
It's the loud humming noise that you can hear throughout the video. I'll try checking inside but have almost no mechanical knowledge.
Can't really tell whats what from cell phone video, but then again I'm damn near deaf.
If you can turn a wrench you can open the diff up. Put a drain pan under it, unbolt the bolts, hit the cover with a rubber mallet after it stops draining and take it off. At that point you can look and see what's going on there. Diff problems are usually pretty obvious. Chunks of metal missing, gear tooths missing, shavings in the diff fluid, ect.