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If one of the connectors is missing you probably have a manual transfer case. Do you have a switch on dash or lever on the floor?
When you shift it into 4WD do you have any noises? Can you tell if the front driveshaft begins to turn?
On a lift will be the easiest way to diagnose this. First this is if the driveshaft turns while in 4WD. Weather or not will determine the next steps
If the driveshaft doesnt turn the problem is in the transfer case not the front end. If it does turn the problem is in the front end and not the transfer case. Normally the transfer case will not give power to the actuator unless the driveshaft turns.
I will be awaiting your response