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The shifter may be broken off or just came out of the shift shafts in the t case.
What needs to be done is the console should be removed(if it has one), then the rubber boot from the shifter, then remove the 4 12 mm bolts that hold the shift tower on( they may be off already)pull the shifter out and inspect it, it may have just come out because the bolts vibrated out and just needs to be put back in and bolted down. Let me know what you found and we'll go from there.
This information is for a mechanical transfer case, if it has ECT transfer case it's different.