How to Run the Numbers on a Chevrolet/GMC Truck

Let's Run the Numbers on this truck and do some Decoding along the way. This truck is a One Owner 1969 C-20, that belongs to a friend of ours. Because we know the complete history of the truck, it will make a great example for our Numbers Run. Truck owners/buyers all want to match Title numbers with the truck Vin numbers, to ensure the authenticity of the truck. Some owners/buyers will want to match the frame numbers also. And some owners/buyers will even want to match up the drive train numbers if they can. Here we will show you how to do this. So let's take a run at the numbers on this beautiful one owner Chevy Truck.

chevy truck


First, Let's take a look at the Title. We want to make sure that the VIN on the Title matches the VIN on the Truck. Make note of the Vehicle Identification Number(VIN), as you will be checking it in several places on the truck. Also note the Make, Model, Year, Mileage, etc. We want to make sure that the information found on the title matches the information we find on the truck.

The Title (below) for our truck list the Model year as 1969, the make as Chevrolet, the vehicle type is Truck, so we have a 1969 Chevrolet Truck. With a VIN Number of CE249Z8XXXXX. We can now check and see if the VIN Number on the Title matches the VIN Number on the truck.

title chevrolet truck


To see if the Title VIN matches the Truck VIN we will need to find the VIN Plate, on the truck. This will be a metal plate with embossed/stamped data on it. It will be permanently affixed to the Truck. VIN Plates are usually found on the Drivers door pillar(front, rear or top). Our truck has the VIN Plate on the drivers side, rear door pillar. Check the VIN Number from the Title with the VIN Number on the VIN Plate to see that they match exactly. In 1965 GM started using Rose Head Rivits to attach the VIN plates on all GM cars and trucks. If your truck was built after Jan 1, 1965, take a look at the Rivites that hold the Vin Plate in place, to varify that they are original factory Rose Head Rivites. Trucks built before Jan 1,1965 used either spot welds or round rivites to hold the VIN tag in place.

chevrolet truck vin decode decoder vin number

As you can see the Vin Number on the Title matches the Vin number on the Vin Plate exactly. The Rose Head Rivits are also correct factory originals. Now that we know that the Title matches the Cab, let's take a Minute to Decode the VIN Number. Vin Number Decoders can be found HERE.

Our VIN, CE249Z8XXXXX Decodes as follows C = 2WD, E = V-8, 2 = 3/4 TON, 4 = PICKUP, 9 = 1969 YEAR, Z = FREMONT Assembly Plant, 8XXXXX = Build Sequence Number


Now that we have varified that the Title matches the Cab, let's see if the Cab matches the Frame. Most trucks have a STAMPED number on the top frame rail that is a part of the VIN Number. This number will include your Build Sequence Number, making matching a easy task. The number is located on the TOP of the frame Rail in 2 places. it is usually on the drivers side but can also be on the passenger side in some model years. See the pic below for locations.

chevrolet gmc vin decoder

In the picture below, you can see that our frame VIN is 9Z8XXXXX and it matches the last part of our Truck VIN (CE249Z8XXXXX). We now know that our Frame and Cab VIN Numbers match, meaning the Frame and Cab, were married at the Factory.

frame vin decoder chevy truck

With the title VIn matching the truck VIN plate, and the partical VIN on the frame matching them, we now have confirmed that the title, cab and frame numbers match and our truck will stand up to any DMV/BMV scrutiney. Next let's take a look at how our truck was Optioned.

THE SPID (Service Parts IDentification sticker)

1966-87 Trucks have a Service Parts IDentification sticker(SPID) affixed to the inside of the glovebox door(some trucks have it affixed to the front innner fender). The SPID will list all the options on the truck, as well as VIN and Model numbers. Check the SPID to see if it matches the truck VIN and then you can see what options your truck left the assembly plant with. Our VIN of CE2498XXXXX matches the VIN on the SPID so we know this SPID belongs with this truck, and we can look up the options. For a list of RPO (Regular Production Option) Codes and definitions click HERE. Also listed are the paint code, interior code, Wheelbase, Model number, and VIN Number. The Model number for this truck is CE20934. That tells us that this truck is a 2wd, V-8, 3/4 Ton, Long wheelbase(127"), Fleetside. To find a Model Number Decoder for your truck click HERE.

spid option sheet chevy vin decoder


1965 to 1972 Chevy/GMC trucks came with a Protect O Plate. It is a metal data plate attached to the last page of the owner protection plan booklet. The Protect-O-Plate(POP) was used by the dealer for warranty work. It contains several numbers that can further verify your trucks originality. The VIN is on it, the engine number is on it, the transmission number is on it, and the Rear axle code is on it, so you can verify these componants as original to the truck. Carburetor type, build month, and vehicle manufacturer can also be found on the POP. The original owners name and address were added by the dealer and are very often found attached to the POP. The POP is stamped in reverse so that it would show up correctly on the dealer invoices when processed through the GM Addressograph machine. Here is a pic of the Protect O Plate that came with our truck, on the left below. The Plate on the right is the same Plate, only reversed so it is easier to read. Decoders for protect o plates can be found HERE


On our plate the VIN is at the top right and it matches the truck VIN. So we know that the Protect O Plate is correct for our truck. We also have a Engine ID number of V1130XD, a rear axle code of JU1120G and a transmission number of 69T328. These numbers will match the numbers on the componets(Engine, Trans, Rear axle), if they are original to the truck. Let's check the drivetrain numbers on our truck. We have a engine ID number of V1130XD that we need to check against the engine in the truck. More info on engine numbers can be found HERE.

We have a Transmission number of 69T328 that we need to check against the Transmission in the truck. More information on Transmission numbers can be found HERE.

We have a Rear axle number of JU1120G that we need to check against the Rear Axle in the truck. More information on Rear Axle numbers can be found HERE. In the pictures below you can see that the numbers match, but their are a few discrepancies that need to be addressed.



Here is a pic of our Engine ID Number. You can see that the protect O Plate number of V1130XD matches the Engine ID number of V1I30XD. But wait!, what about that I? This is a common anomaly found on Chevrolet/GMC vehicles of all types. The workers at the engine plants commonly used some letters for numbers. This was always done in places that letters didn't belong. So you know from that, it must be a number, and that's how I's become 1's.

69T 328

Here is a pic of our Transmission ID Tag. The number is 69T 328 which matches the number on our protect O plate. It decodes to 1969 Truck Trans built on the 328 day of the year. The 328 is a julian date and in this case decodes to November 24th 1969. 43527 is the serial number, but it does NOT appear on the Protect O Plate.


Here is a pic of our Rear Axle Stamp. As you can see, we have a discrepancy. Our PoP says JU1120G but the stamp on the housing says JU1122G1. The 1 after the G on the housing is for the Day Shift. It is not unusual to see that(Day/Night Shift code) on the rear end, and not on the PoP. So really the only discrepancy here is the 2 on the housing, which according to the PoP, should be a 0. So what happened here? Well there are two possibilities. Either the Axle was swapped after the truck was built, or the axle was miss stamped at the assembly plant. Our truck owner says that the truck was in for some rear end work, early in it's life. But he didn't think that the rear end was swapped. So most likely we have a miss stamp from the assembly plant.

That covers the important stuff, but there still is some more info on the PoP. The R on the side is for Rochester Carb. The D underneath, is the build month, December. The Chevy symbol below that, denotes the truck as a Chevrolet. More info on Protect O Plates and how to decode them, can be found HERE. That completes our Numbers run on this Beautiful 1969 C20 Chevrolet pickup.

Thank you to our owner, for letting us use his truck as our Numbers Run Example.

Here are some more pics of this beautiful truck, Before and After the Restoration.


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