904 shifting issues with the motor OUT

I'm at a loss here. I left it shifted in what should have been neutral, and pushed it into the garage with my truck. There was definitely more resistance than there should've been for pushing a car in neutral. Either way, I ended up dropping the motor and pulling both motor and tranny out for an unrelated reason. Dropped them both in, and tried pushing the car out of the garage into the driveway....NO DICE. It's stuck somewhere in a gear. The linkage is disconnected, so I manually selected each gear under the car. It won't move in any gear. I don't understand how I could move one rear wheel before, but now it won't move at all?