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The deuce valve is the common approach, and it has the switch to indicate when the axle is engaged. Any 3 port valve wil work, it just has to supply air, and vent the outlet when released. The valve goes into the air line on the passneger (left) side ajacent to the transmission where it goes to...

Ok...The M-39 series 5-ton trucks all have transfer cases with over-running clutches for the front axle engegement. (Commonly known as a sprag clutch but usually not, most usually they are roller clutches, but still an over-running clutch.) The clutch engages either in the forward drive or rear...