Tim,
Does your 2 speed axle have one or two vacuum lines going to it? I have disassembled the vacuum shifter on my COE with 2 lines and I don't believe it defaults to low, at least I have never experienced that while working on the shift mechanism or driving it. I assumed that the two lines going to separate chambers on each side of the diaphragm were to use vacuum to pull it into the position you want with no spring needed.
As I stated above, my Diamond T has only a single vacuum line to the shifter on the axle and I have experienced it defaulting to low (or neutral) several times when leaving it in high range and then shutting down the engine.
Maybe someone with more specific knowledge about these particular axles can chime in to clarify this for me. I guess I could test the COE by leaving it parked in high range and jacking up the rear and count drive shaft/wheel revolutions to see what gear it is in.
Kent
