1989 240sx automatic. Just purchased a few weeks back for 800.00. It runs, but really crappy, it's okay cuz that motors coming out and either jz/rb going in

so I put the car in neutral to push it out of the way of the street sweeper, and it doesnt move!!! i'm pushing as hard as i can (yes the ebrake is down) and it moves an inch or so. I took me and my roomate to move the car, and we were both pushing really hard. When i start the car it idles rough, and when i put it into drive and hit the gas, the engine just revs and slowly catches and starts to roll. I jacked up the front and back of the car and spun the wheels. the front wheels turn, but not freely and seem to rub on the brake pads. the rear wheels turn (while in neutral) but not like they should. hard to turn. if i spin them they only move like 1/2 turn. What do you guys think, diff? driveshaft maybe? or maybe the transmission linkage? I just want my car to roll !!!!! lol