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There is a supply line to the transmission and two lines going from the transmission to the transfer case. On the top right side of the transmission is the poppet valve assembly. Once the air tanks are charged, one will hear the poppet valves cycling when shifting into first or reverse. It...

The sprague unit works mechanically. The reason for air is to set the direction. When one shifts the transmission into first gear it sets the sprague into forward. When the transmission is placed into reverse the sprague is then in reverse. That is why one can’t coast backward when the unit is...

As Wes has posted all the differentials have the same gear ratio. The intermediate and rear axles do almost all the work, remember there is no interlock. Under normal nonslip conditions, when the truck is being driven forward the rear drive shaft will turn at X speed. The front wheels...