I agree with 70
As to driving it; Highly not recommended except possibly to move it around the shop.Depending on which of those listed possibilities is issue, more damage could ensue. For instance; if the band is not anchored, the spinning drum could pick it up and try to spin it around. If the lug is still on it, it could jam up in the housing, wedge in there and break out the case.
I guess there is another possibility. Synchronization of trans lever with the shifter. However since you say Drive is ok, and you didnt mention a starter cranking issue, its unlikely to be that.
Drop the pan, the problem should be obvious.Could be as simple as the strut is laying in the pan.That would likely be a faulty install.
