Release the emergency brake.
If the wheels are off the ground with no resistance, the rear brakes must be on/screwed up. Or rear end/driveshaft locked. Turn the rear wheels by hand one at a time with engine off and trans in neutral to check movement of driveline. If it is still stuck, push in clutch. If that works, its a clutch component bind. Clutch plate/spring fingers,fork, pilot bushing or throw out bearing could be binding somehow. Never heard of tranny guts getting that screwed up after being checked over and lubed.
