M923 transfer case issues

[mthullm54a2]

Working on a m923 and the transfer case will not shift when air pressure goes above 60 psi but when I shut it down and bleed off the airtanks so it has no air pressure it shifts fine any ideas

 

[porkysplace]

Some reading for you.
[h=1]transfercase is stuck in 2wd mode.[/h]
[h=1]M923 A2 HI LO Stiff shifting Problems[/h]
[h=1]M939 Transfercase shifting[/h]
[h=3]transfer lever button[/h]
[h=1]M925 transfer case posessed ? Will not shift above 65 psi in air system!!![/h]
[h=1]m923 transfercase help[/h]
[h=1]923 transfer case wont shift[/h]

 

[mthullm54a2]

Thank you