driveshaft and rear wheels turn hard

Hi guys...hopefully I won't sound too stupid, as I'm no mechanic.
I just pick up a 72 340 Duster. When moving it in the yard, the rear brakes felt seized, got itinto the garage, removed the drums, but the wheels and driveshaft are still very hard to turn. Is this a tranny issue, or is it caused by the car sitting for awhile?
Author: admin