Looking for some help on my problem with my 93 all wheel drive. I'm hoping someone has had this same problem since I could not find any searches on this. I bought the car used and built two cars into one. So I am not sure what's happening...

...Everytime I turn a corner or make a u turn, my rear wheels seem to lock up or turn with alot of resistance. Going straight seems okay but my et's were way down this past year.HELP!!!

I'm guessing either the transfercase is the wrong one, the transmission diff is messed or the rear calipers are seized and are only affected when turning the most. PLEASE HELP!!

Any input would be greatly appreciated.
Thanks, Paul