let me preface my response by saying that i know pretty close to nothing about GMC trucks, but when i looked into this (boring day at the office), i came up with the following: "F" indicates that it is a cab over engine configuration "354 24" is a 1954 model with a 179" wheelbase, "P" is the Pontiac (I assume Michigan) assembly plant and "6562" is the sequence number. I'm ready for my pot shots.