[aerotruk63]

I spent 5 hours going through the one's from 63. What emerges from the codes is the size of the truck 14/ 15/25/36 series has significance. What motor was ordered. Standard or Auto. Clutch. Color Combinations. Heaters, even found three different codes for the Radio...

For the radio's I thought of the differences, when there was one radio available. There were different motors requiring different brackets for the condensers and ground straps for a V8 compared to the inlines. This, I'm assuming.

The more your willing to share the info on yours or your buddys truck , the closer the accuracy of breaking the code.