On the underside of my hood is written "transport" for the transport blue lower body color I assume. I have writing on the firewall under the voltage regulator but have not yet deciphered it. I have seen the markings like healing bear showed that spelled out different items on the truck. His "auto" for auto trans, "electric" for electric wiper motor, and such. Not very cryptic, I just assumed they were to guide assembly line workers on an ordered truck.