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Sd39u there are 3 positions on the transfer case shifter high, neutral, and low. Fix the interlock or disable it. Push on the transfer case leaver, and hold pressure on it, as you shift the transmission into reverse or 1-5 then quickly back to neutral it should slip the rest of the way into gear.

Let all of the air out and try to shift it, with it aired up the shifter is locked until you let the air off of it by pushing the button.

No only the auto engagement of the front drive, I want to be able to roll in low rear drive only or 6x6 when I flip the switch.

I personally disable that and the auto engagement for the front drive

Yeah you should be able to just remove the air line from the actuator and cap it and the spring should push it back so you can shift the transfer case, if not unscrew the actuator and use the magnet to remove the detent pin.

Okay colt at this point we need to check out a few things. Do you have the shifter down, parallel to the floor, in high range? Check the switch on the shifter with a multimeter then at the solenoid. If you have power and the air is dumping when you push the button, then remove the actuator, it...

Yeah bud I have several cabs, Hattiesburg, MS 500

98G is correct but you have to understand when he says no air that means shut the truck off then open the gladhand on the driver front and let it bleed off all the air and you might even need to pump the brake petal to get all of it out.