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If you are saying that the transfer case is stuck in 4WD, you may have to get under the vehicle, and look at the transfer case, on the front, you should be able to see where the 4WD shift lever hooks to the linkage. If it is disconnected/broken, take a pair of channel locks, or pliers, and pull the shaft you see coming from the transfer case. this will disengage the 4WD. Unfortunately, if you cant pull it. You will have to get someone to put the vehicle in Drive, and creep forward while you pull it. Make sure their window is down so they ear you say stop.
2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.
Since it seems no one has answered in 3 days I will say something. Some of the 4 wheel systems use vacuum to lock and unlock the 4 wheel system. There are solenoids in the transfer case which adjust the functions into 4 wheel auto, 4 wheel, and 4 wheel low settings. On the units that use electric, the electric strength or power determines how far the electric solenoid extends or travels to change gear functions. These are sensitive electric settings. A burned out dashlight factory wired into that circuit can change the result of what 4 wheel function you will receive. So will a bad connection of a plug-in to the transfer case.
A technician can test the wires to the transfer case and see what electric readings are going into the transfer case when the dash is set to the different dash settings. Besides a Dealer, a really good transmission shop can perform this test.