What are the most likely Donor vehicles for the A 500 4 speed automatic?

moparmarks said

Had the big multi-pin connecter, not the 2 or 3 pin and no mech K/D. Looked to be a pretty stock plain jane van.

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I wonder if the reason the rig was there was because someone swapped an RE trans into it not knowing there was a difference and when they got to the point were they found out, they just junked the whole rig rather than pull it and look for the right transmission.