The A pillar tag is supposed to be the VIN plate NOT the data plate. The Data plate is under hood. Sometimes on kick panel. You need to post good clear pics of this plate..
The 1T was available with a 235 STD, 261 or 283 RPO.
"Apache" name was started in 1958 and transitioned to "C" in the early sixties. C30 is 1T and Apache is "light duty Chevy truck".
Assume you are talking about the "A" pillar post. I really don't believe a data plate should be on that skinny frame area. My W.A.G. is something fishy. Obviously the title has a VIN. The VIN should be correct for the truck. There should be a plate somewhere that has that same VIN on it. In the proper location. With the proper rivets. If not, it's all fishy.
Generally, the VIN has no motor, diff or trans info. You get that from visuals, serial numbers and cast numbers/dates. To see what drive train ended up in the truck over the years.
You have a big GMC. Are you building a fleet of haulers?
