Welcome to 2CarPros.
If you can't shift from park, it isn't the result of the transfer case. The system has a park interlock system which prevents the shifter from moving without the brakes on. First make sure the brake lights are working. If they are, we either have a problem with the interlock actuator or cable, but are under the console (left side for the cable/right side for the actuator). I attached a picture of both. Let me know if the brake lights are working and if I am correct in thinking the shifter will not move from park. As far as being in 4wd low, that should not prevent you from shifting.
Let me know.
Joe
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Monday, June 24th, 2019 AT 8:02 PM