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

Kern Dog said

Maybe someone mentioned it and I missed it BUT regarding the manual toggle switch for lockup and overdrive, do these stay engaged as you slow down below a certain speed? I'd think that as you get below say...45 mph, the OD would disengage.

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I tested in on a 518 retrofit and od didnt disengage until around 25mph. My 518 didnt have lock up converter so I dont know about that part. Either way i wouldnt recommend leaving them on that long. Basically my od was for hwy and was left off all the time for in town driving.
I have thought about using a B&M shifter with a line lock button on the shifter knob to control both both on the next one.