what 4 speed auto transmissions can i use? 46rh etc

A quick Google turns up little

I found this "Hot Rod" article from 1996 which listed a part number:

http://www.hotrod.com/how-to/transmission-drivetrain/43323-mopar-overdrive-transmission-swap/

And Googling that number

"mopar performance", P5249165

Turned up zip

Any hits I got were back in early 2000 ish