Made a quick video on diagnosing the most common areas of the 4x4 system with a few simple checks and you should find your fault. The vacuum system is at fault 90% of the time and the electronic shift motor the other 10% of the time. I hope this helps!

 

Thanks, I love youtube!! You can learn anything from carving a pumpkin to taking out an appendix. The videos on autorepair are invaluable.

 

I wouldn't advise you to take your own appendix out