BB 727 + transfer case?

Of course. You need the tail adapter and mainshaft out of a 4x4 equipped 727. They also used them in IHC and "I guess" Dodge trucks

If you have a good AMC trans you can re-use most the parts in the BB case "depending" on year and whether one or other had lockup converter (hydraulic)

I would likely just start with a reconditioned BB 727 and bolt to my transfer case parts.