I have done this a couple of times. Thought I would compile it in 1 place and maybe it could be a tech article for the future.
NP 203 transfer case: (
www.chuckschevytruckpages.com )
NP 203 typical shift pattern:
NP 205 transfer case: Notice the circle with 3 bolts in the middle, easy way to tell a NP205.
NP 205 typical shift pattern:
NP 208 transfer case: (
www.fourwheeler.com )
NP 208 typical shift pattern. Notice you have to pull the shifter to the right and down to enter into 4WL.