At a loss....

I'll save the intricate details. Basically, I'm wondering if you guys can help me ID my transmission now that I don't know what I have.

Ignorantly I assumed if there was an automatic mated to a 318 in a 69 dart, it would be a 727.
But, I recently got my dart running and found out that it only has 2 speeds. According to my mechanic, it's not that there's anything "wrong" with the trans; it's that it truly only has 2 speeds.

If that's the case, seems like a silly concept for a trans.

I guess that means I now will have to buy a new trans if I throw a 360 in there.

Any idea what trans I have?

Happy Fathers' Day to all of you out there.
Thanks.
Stepper.