I build alot of trucks from scratch and I've had a heck of a time with this VIN deal over the years. I have one truck here that is a 78 frame, 89 engine, 80 transmission, 84 cab, 91 front , 76 bed and 87 axles. I used the Vin that was on the cab, but it says its a 1/2 ton 2wd and truck is 3/4...