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I have a theory about these trucks. They were designed to be smarter than some of the drivers. If it don't do what it should, fix the problem and let them run.

My M925 is doing just what it should and I am not going to change anything. As said a better driver could get away with disconnecting the interlock and if you feel you need control of the front end engagement then do the air switch washer /tab thing. For the people having trouble shifting with...

[QUOTE=SLOrazorsedge; Why is it we can actually engage the transfer case w/o air pressure? Is it just lucky hair of the dog manual exertion making engagement?[/ I would think interlock cyl. is spring loaded in the disengage mode without air.

Yea im just learning about my 931 but the TM's do show the lock out. You need power to the transfer case button then power out of the button to the solenoid on the transfer case #B that opens and lets the air out of interlock air cyl. #A. If all the airlines are correct and you get power to #B...

Did you start with checking if you had power to the release buttton on the transfer case lever? if you have power to it then check if the power is comming through by checking the outher wire with the button depressed.