Anybody know if there are any diferences between a NV4500 out of a 4x2 and one from a 4x4 truck?

Is there anything I can do to mate it to a np203 range box, a np205, or a toy "3spd" transfer?

Any other info is appreciated!!!

Ther are a bunch of versions of the NV4500.

Dodge-29 spline 4WD HD

GM-32 spline 4WD

Dodge-23 spline 2WD

Go to Advanced Adapters' website, you should find what you are looking for for an adapter to those transfer cases.