check the one near the shift linkage, make sure there are an equal number of pins on both ends.
Almost all tcases going back to the early 80 (late 70s) will have a 2 wire connector there to illuminate the 4wd indicator lightt inside the cab, later models will also have an additional sensor to tell you when it is 4Lo
What I suspect is you will find the tcase has 2 or 3 wire outputs in that pin (even if it is a 4,5 or 6 in connector) and the vehicle side has 4 or 5 wires...
