Jeff - Way to go! Very interesting.
I'll just add some observations from my '99 and some questions.
Newell told me the air to the tag bags when through a "proportioning valve". You pressure readings do not seem to support that, or if you have that proportioning valve it is set to 100%.
I was unable to get the transmission to select a gear with the tag axle switch in the up ( bags full of air ) position and this seems to agree with your alarm.
I am wondering why when the switch is in the up position you did not get a higher pressure in the bags. I will assume that your system air pressure was higher than 104 psi. So where did the 104 come from? Maybe an air pressure regulator set to that maximum. Maybe if you had waited longer would it have gone higher?
Please keep us informed as you get more information from your pressure transducers. It seems that using the switch in the down position for taking load of the tag axle when making tight turns might be possible as there was not a large change in ride height. Again, Thanks - Russ
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