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When things are working correctly, one will hear the same sound when shifting into first or reverse. If it isn’t disengaging the Sprague unit when one drives damage can be done. More likely you will feel a dragging or scuffing sound if the Sprague is not disengaged.

The 800 series trucks have an air line that feeds the transmission with air and two lines that run from the transmission to the transfer case. When one places the transmission into first or reverse poppets are engaged that sends air to the transfer case locking the truck into six wheel drive for...