I was driving last week and everything was working fine but I got into high RPMs of 2nd gear and I hear a loud thumping start all of a sudden. I pull over and cant visually see anything (carrier bearings/midshaft support) damaged. So I leave it there (a short residential neighborhood) for a couple of days and search for possible problems on the internet. I know that there is no way to get a for sure answer without dropping tranny, transfer case and driveshaft but any insight on my problem and possible solution is greatly appreciated. I now have my car in a place where I know the owner and is safe from towing.
I.E. what are the symptoms of a locked up transfercase, and anyone have any links or connections that could send me to options of a new tranny.

P.S. the thumping (coming from directly below me) continues even with clutch in.