Help on front hubs?

[setandreel]

Hey all,
I have a 87 silvarado 4X4 just checked my auto hubs and the small bearing on the spring is gone, don't know how long, have not used 4X4 since Feb. I am leaving on Sat. on a 720 mile trip. Question, is my transfer case full time or part time? Every one I have talk to say's 208 and it looks like a 208 but I checked the tag and it say 203? Very confussing. Could be a miss print in the stamp. I want to put warn hubs on and I think it would be pretty simple if it is not a full time transfer case. If it is full time do I need a kit of some kind to make it part time.
Thanks in advance
Mike