C = Conventional Cab E = Eight Cylinder Engine 1 = 3,900 - 5,800 lbs in GVW 09 = 55-59 in. for Cab to Axle Dimension 34 = Fleetside Then you should have some more numbers that give you the production year (2), where it was made and the production sequence. Visit the Oldride Library for more info [url]http://www.oldride.com/library/1972_chevrolet_c10.html[/url]