If my B2 Transmission piston has failed will the tranny not engage in either gear?

Vac system may be suspect as well. Would bad vac pressue leave the transmission lifeless.

I pull started the car, drove it for about 40 min total and then parked it. Now the transmission doesn't seem to respond during second attempt at pull start.

Any Ideas what I should be looking for.

Will replace glow plugs as soon as I can to get her going and then start learning how to diagnose this wonderful car.