Brian,
Are you sure the manual that came with your truck is for the new series truck. It very well could be possible that they have the air brake system of the '63's, but the truck that you have is a whole brand new design. In '66 there were probably more models than any other year. They still made the '60 to '66 conventional style trucks, cab overs, believe they still had the series "B" and series "L" as well as the new style.
Bill
