Rear end destroyed last night block from house. Need help figuring out why.

[evolve520]

So after just painting my truck I was out enjoying it. A block from my house I feel the truck sort of slipping and then a loud bang followed by grinding sounds. Pull the truck over and see a trail of fluid behind me. Look under the truck and drive shaft it's separated from the rear end but still slightly connected and the rear end is ripped open. Any ideas what would cause this? Transmission is new last November. I assume I am in the market for a new rear end, possibly a new drive shaft too. Hope the transmission was not hurt. I can't figure what would cause this. Any thoughts??
Jon