I was standing there and didn't hear any noise. I thought you had accidently popped it in neutral.
The diff is cast steel so it's ok to weld to it. It's best to preheat it, but probably didn't have the heat setting on the welder up high enough to get a good penetration.
Sorry to hear about all the carnage nick, looked like you were pretty bummed out when i saw you beside waterfall. hopefully you can get it fixed quickly for a wheeling trip or two over the summer! And tell your wife she's awesome for letting you come!

Just placed my order for synthetic rope. That was the first time I've seen cable snap and I see why it can be so dangerous. Only rope for me from now on.