I have not seen this floating around here, and figured it couldn't hurt anything to post it up. Who knows, maybe it will help you in some way down the line. It is a 2 Gen 4WD System Diagram I got from some shop or another that failed to find WTF is wrong with my 4wd about a year ago. I finally tracked it down and scanned it in. Hope it helps. Enjoy.

 

That's a good diagram. I have a similar one, but it is more of a schematic view than an exploded view like that. This is only for the NV233 transfer case though. The NV236 vacuum diagram is different.

 

Weak. Well if you need a diagram of the NV233... this is for you then!
Bonus Round: I dont have the corresponding names-to-numbers page. So this is a call to to the community. Can you name that parts in this picture? (Yes I know you could probably just google it, and since swartlkk is actually a GM super computer, it's not fair for him to just name every thing )

I'll exhaust my vast knowledge of 4WD systems first:
1) Vacuum Accuator