4WD shifter kicks into neutral

[transio]

Maybe it wasn't fully engaged?

[jgrish]

It has happened 3 times now and i've made sure that it was fully enguaged. I even made sure and went out and tested it and it still popped out.

[mbeach]

Ahhh... a member from the 'nam.

How are your engine/trans mounts?
Can you crawl under the truck and see if any excessive movement of the engine/trans/t-case would cause the shift linkages to shift themselves?

This sounds pretty serious, I'd get on a solution quickly before it pops into neutral at 80mph on the All American Exressway....