see if you can find another motor and tranny that would rock the casbah you could take the time rebuild them both and then swap them in and have yet another reliable set up and then rebuild the one you pull out and sell it or keep it and work the shit out of it.

as for the door lock why not scour the junk yards for one the locking unti itself i am sure you wold be able to find one with ease and if it is the actuator then you can get one of those from any radio shop and with a little bit of time put it in yourself or like clint did pay someone a small amount of money and get it done.