right rear wheel brake sticking on

72 duster, car sat for years, redid front discs, new metal lines on rear. when i go for a drive right rear wheel gets very hot. just rebled brakes again and went for drive, same thing, heat gun says 214 celsius, 51 on drivers side. jacked up rear of car and put in drive at idle, drivers tire turns, pass side doesnt, in reverse both wheels turn. any ideas?