I'm curious as well, I'm planning to do the fat 47RE output with the dodge spline Tcase input, and put it in a Ford 273.
To my knowledge, the guys I asked (you might be able to find my thread?) claimed the shafts are different lengths for each manufacturer, and have to be shimmer accordingly.
NP273 Transfer Case GM Kodiak, Dodge and Ford rebuilt replacements and Parts
This is the list I referenced. I didn't see any other structure changes, but it's been a while since I looked. I got the link from my conversion spreadsheet.
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