ok im curious on this now. My truck has the manual locking hubs to put it into 4x4. and then the auto button to engage it. if the hubs are not locked in, will the switch put it in 4x4 mode or not, ...
You could do that with manual hubs, just don't get out and lock them in..... leave them in FREE. With ....On the Fly 4x4 ...that runs on vacuum once you turn the switch on the dash, if there are no vacuum leaks you are going into 4 wheel drive. The hubs are run on vacuum and the transfer actuator is run on electric but they work off the same switch.