I don't keep up with the latest in GM changes, but as far as I know, the 4L80E is a 4 speed auto unless its been changed?
Add to that that it is shockingly heavy (I'm guessing close to twice that of a 727), and quite large, and doesn't really lend itself to use in any Mopar without extensive modifications.
The Keisler 4L65E conversion has all the benefits that that would have in my opinion, weighs about 100 pounds less, doesn't "require" stupid paddle shifters, and can be installed without cutting and installing a motorhome/van sized hump.
I'm glad to see that someone is offering another option, but I would rather see someone come up with a kit/controller to use the better NAG1 for those of us willing to cut our cars.