Holy Crap Batman!
What where you doing!?! Once again, this may or may not be related to what I discovered. Last year, I found nearly every bolt that holds the diff on my GTS to be under torqued by as much as 50ft/lbs. I had to retorque everything last fall because I heard a clunk when letting off. After retorquing, the clunk disappeared. I could see this causing Diff failures. Your GEN1 is setup differently though, as the GEN2 does not have the ladder torque bar, but mounts to a brace above the diff which is attach to the frame. I believe that's why my GTS has way less wheel hop than my GEN1.
Don Sharf Automotive will have a used ladder bar in stock for cheap. You would think the aluminum housing would have cracked open before that steel tubing would snap like that! At least it will be a cheap and quick fix.