Transfer case in neutral, transmission in 5th . Check for a steering column lock , by turning the steering wheel , fully side to side, with the ignition off , key out. Many years of Jeep ( Chrysler products ) had a steering lock that only engaged when the steering wheel was 180 degrees from straight ahead.
If you have the lock as my mini van does , you will need to leave the key on and disconnect the battery to prevent drain and mileage rolling up.
Park brake off.
You may be able to find a free download of the owners manual on line, or pick one up at a salvage yard. Good to have.