Wow, I've never heard of cracking a block by throwing a u joint
One possibility for your drive issue could be the axle shift actuator. If it's not locking up it'll just spin.
"But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." - Thomas Jefferson, Notes on the State of Virginia, 1782
Arguing with a truck driver is like wrestling with a pig in mud, eventually you realize the pig enjoys it.