np203 diagram found here:
Here's something missing from the chilton book:
For those interested on a blow-up diagram of the np203
I found a nice one online at
just put any bogus number on the parts search, and you should get a link to the "new alternate catalog" there you can select any truck that came with the np203 I tried
1977 GM pickup:
select "transfer case" -> "transfer case assembly" on the left frame then np203 on the right frame.
and you should get a list of part names and numbers, click on any part name and you will see a "view graphics" option with the number for that part in the diagram.
Click on the number to see the diagram!
Hope this helps someone!