Killed Transmission?

I have been using my 200? Ranger 500 with tracks in the heavy snow in North California. Did real well until I tried chewing up a slight incline with really slushy snow after days of melting what started as 4 feet or more. The tracks were slipping so I though is was OK to keep going but lost traction and absolutely no power to wheels (tracks)Was in low range AWD mode. The shift lever is stuck in low gear and is absolutely jammed. Did I scatter the transmission or is it possibly an easy repair.

Or could it be something completely different like the front or rear drive jamming the transmission? Diagnostic suggestions please?