I copied this from an old thread, not sure who posted it. But I knew it would come in handy:
Vacuum Lines from front disconnect:
Green: From Transfer Case to Disconnector's port, closer to passenger's side tire. 2WD supply
Yellow: From Transfer Case to Disconnector's middle port. 4WD supply.
Black: From Disconnector's left port to 4WD light valve on right fender. 4WD light.
Blue: From Transfer Case to the right fender, ventilation only, with a black/black valve at the end.
-Rich