That's the GV unit? That's NASTY for a few hours on jackstands.....
Personally, I don't think that there's much point in taking it apart since the guy you talked to said that he won't sell you any parts.Yep! Haha. That's not even all of it. It's everywhere. That thing was not happy. The case halves wont seperate. I might try to find a c6 tail housing and proper driveline and just eliminate it.
We will find out shortly! I'm leaning towards the same thing. I just don't understand what internally could cause it to do what it's doing.