Glenn I considered a built 4L80E, but then I would have to acquire an expensive adapter for it to mate with the Cummins, get a trans computer or controller of somekind, etc, etc....the 98 Dodge came as a complete package and it all works. I talked with Greg Ducato (he is a trans specialist) about which route to go, in his opinion I would be just as good going with the 47RE and Dodge computer, and doing some of his suggested upgrades with a single or double disc convertor, as I would switching over to GM stuff. The Cummins has the equipment on it to operate the 47RE now as well.
I know I will upgrade the 47RE for the extra torque I'm planning on, but for now I will get it in the truck and driving before doing any trans upgrades. (hopefully those will happen over the winter months).