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

Eventhough I'm daily driving the (lowered) Dart without any issues on speedbumps, I would've liked the transmission to be tucked up a little higher in the tunnel.
The stock deeper 518-transmission pan is the lowest part under the car right now, hanging about 1/2" to 1" below the exhaust pipes.

The 518-swap also let me to install bigger (1") torsion bars and better shocks to cope with 'oversized' and crowned speedbumps.
But at the moment the car can't be lowered much more because the front tires will rub the fenders at 3/4 to full lock.

If I had cut open the floorboard and refab the tunnel, I think I might have been able to gain about a 1/2" in height, but I don't need the extra groundclearance at the moment.