OldGMCtrucks.com - Serial Numbers - GMC Decoding and Deciphering Links and KeyFirst, get the chassis serial number off the. GMC used to identify '39-'59 trucks by series, thenwheelbase, then chassis number. It brakes down like this: From 1939 to 1950 they used letters, from '51-'53 numbers, then in ' 54 numbers followed by a letter The First letter is the 'year bracket' ( A='39-'40, C='41-'46, E='46, F='47-'50 Z=54, Y='55, X='56, T=57, S='58/'59, N='60 ). The Second letter ('39-'50) is the cab type ( C = Conventional ) The Third and fourth digits are the series ( 10 = 1/2 ton-100 Series, 15 = 3/4 ton-150 Series, 25 = 1 ton-250 series, 28 =280, 30 = 300 and so on) The fifth digit (or third digit in '51-'53) is the series is the wheelbase (such as in 1/2 through 1 ton, 1=116', 2=125.25', and 3=137' in '47-'54) The sixth through twelfth digits are the regular production numbers which are simply a sequential number given to each truck as it came off the line. There are also muliple letter codes for larger trucks indicating a COE, tandem axle,or diesel engine. GMC didn't really look at truck 'years' so much as at did model runs which in many cases ran for multiple years.

The chassis serial number for each year are only found through multiplesources and there is no central registry of GMC serial numbers (also incorrectly called VINs) other than what I have put here as far as I know. The numbers, for the most part, started at 101 in '47 andwent up from there for each individual series. So the first 1/2 ton off the line in '47 was FC101 001 and the first 3/4 ton was FC152 001. In the mid 50s, they started each year with 1001. If yourserial is something like ' 102 22 P 2537 ' then your truck is: 10 =1/2 ton, 2 =longbed, 22 =228 engine (24=248 engine), P =Pontiac, Michigan assembly (C = Oakland, CA and S=St. Louis, MO), 2537 =regular production number which would by the charts below make this truck a 1951 longbed halfton (1001-28735 was production for '51 in 1/2 ton trucks for a total of 27734 trucks. #2537 would have beenthe 1536th 1/2 ton off of the Pontiac line in '51.

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The vehicle identification number (VIN) is located on the left side rear of the engine block (1) and is typically a nine digit number stamped or laser-etched onto the engine at the vehicle assembly plant.The first digit identifies the division.The second digit identifies the model year.The third digit identifies the assembly plant.