Hey guys, I live in NC and we just went through some pretty cold weather, but I took my X5 out for a drive after the storm. I was at a light and I hit the gas pedal pretty hard to get ahead of someone and when I did I heard a loud boom. Engine seems fine, transmission shifts, there are no leaks occurring anywhere but car won't go anywhere. I do hear a noise, maybe the transfer case but I'm not sure. Definitely not a mechanic, but I'd appreciate any help.