Gentlemen, I'm sitting here reading all these posts about how to pole vault over a mouse turd and I'm surprised at some of the goofy ideas.
The full correct name of the air shift transfer case is "Positive locking air actuated transfer case" Note the word "positive"
The positive locking air shift transfer case is a very easy thing to check. Unlike the sprag transfer case with which you must check operation in both reverse gear and a forward gear a properly operating air shift case is locked when air pressure is put to it by flipping the switch and it can be checked in any gear.
To check it, run the engine to pressurize the brake system and shut the engine off. Place the transmission in any gear and flip the switch. Jack up either front wheel, and try to rotate the wheel that's off the ground. It should only turn a few degrees and stop. It does not matter which way you rotate the wheel.
That's it........
Lower the wheel, disengage the transfer switch, put the tranny in neutral and open another beer.
Lance