Welcome to samurai Ownership!
You can fix this real easy with several articles on the subject that can be found on the internet.
The easiest way to find these articles is to go to Ack's FAQ (
http://wwwacksfaq.com) and do a search for
transfer case. In the resulting list of articles, you'll find at least two solutions.
The actual fix costs less than $20 - shipping included - from Zuks Offroad (
http://www.zuksoffroad.net/samurai_tcase.htm).
Zukers have purchased Samurais with "locked" tcases for next to nothing and fixed them for next to nothing...
I hope that this helps!