42RH / A-500 in a Duster with pictures.

RedFish said

How a material handles load is not all about its thickness. How the material is shaped transfers the load/stress to its other facets. Those 3 and 4 sided elements in the car now are a good example. Their wall thickness is more relative to the attaching hardware used. The majority of it is 11 gauge which is very close to 1/8 wall thickness.

Click to expand...

While this is true, for this application which is somewhat space limited not an option unless you were going to graft in parts of another floorpan from another vehicle.

More work than required.

Some jackass on another board tried to say there was no difference between a A-500 and a 42RH, here is a dozen pages from the Mopar instructors automatic book detailing the year to year changes in transmissions.

In nice printable format ;-)