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Correct me if Iam wrong as forgetting everything. If we just hook up service air that will not fill the air tanks ( remember correct me if I am wrong ) then drain the air tanks if they are holding air and check to see if sprag cylinder / poppets are holding it's pressure. As said reverse to...

Since we need a air control valve that bleeds off the air on the poppet side like you said the Deuce air switch wonder if a lift axle air valve switch. They do the same thing and bleed off the air in the line when shut off. O well OP has his answers.

Also a for air leaks we have the transfer case seal that holds the cylinder air pressure for forward sprag and if it leaks good then in would go into a neutral position from just sitting truck off. You can tell when you transfer case sprag seal is leaking when in forward sprag and you get air...

You would think all air would leak out with the rubber seals and the way the rubber packing is designed on the sprag cylinder piston /poppet. Not real great but they work well till they go bad. When you go from forward to reverse the air you hear coming out if the poppet is the air being let...

Yea you would figure that it was just something I thought might happen ( over thinking). I just posted that in case there is some way that the piston was still engaged. As said I never did the mod but as said you could see if for some reason it could happen with the truck shut off but aired up...

As said I never tried this mod so I do not know if after you cut off the air if the line after the switch could hold enough air to hold sprag in forward or reverse. You can try and see if it does hold air by just switching from reverse to neutral with air cut off a couple of times. Sometimes you...

Yep some guys have done the air control mod. Disconnect the rubber air line that comes off the passenger frame rail that runs to the poppet valve and run a new line into the cab to a air control switch. Then return air feed line from switch to poppet valve. Both air lines control the sprag...