Is it an electronically controlled transmission? If so, it may be a bad connection to the solenoids.
Ive had this happen in a couple different ways on my 92 Pontiac van. For awhile bad connections would keep it from going into OD or locking the TCC when the connections heated up. Then I had a bad ignition switch once, which the solenoid power runs through. Itd start and run, but put it in gear and it wouldnt move. The switch is actually going out again, I got a new one to put in this weekend probably.
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Winter daily driver, parked most days right now
Summer daily driver
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