Looking to decode the VIN of your classic Chevrolet or GMC truck, blazer, or Jimmy? Our comprehensive classic GM truck VIN decoder is the ultimate tool for identifying your vintage rig’s factory specifications. Whether you are restoring a legendary 1967–1972 “Action Line” pickup, verifying a 1973–1987 “Square Body” C10 or K10, or tracking down the history of a first-generation K5 Blazer or GMC Jimmy, understanding your Vehicle Identification Number helps tell the story and verify the truck. Over the decades, General Motors shifted formats significantly, using unique 12-digit serial numbers in the 1960s, 13-digit codes in the 1970s, and the standardized 17-character VIN format starting in 1981. Use our interactive tool below to decode your classic Chevy or GMC truck instantly!
GM Classic Truck & SUV VIN Decoder (1960–1987)
Decodes Chevrolet & GMC Pickups, Blazers, Jimmys, and Suburbans from 1960 to 1987.
Classic GM Truck & SUV VIN Code Reference Chart
| Era / Model Years | VIN Length | Character Position & Formatting Breakdown | Covered Models & Key Notes |
| 1960–1964 | 12 Digits |
| Covers C/K Series Pickups, Suburbans, and Panels. VIN always starts with a number (e.g., 0 for 1960, 3 for 1963). |
| 1965–1972 | 12–13 Digits |
| Covers “Action Line” Pickups, K5 Blazers, GMC Jimmys, and Suburbans. VIN starts with a letter (C or K). Code 14 includes early K5 Blazers ($115″$ Wheelbase). |
| 1973–1980 | 13 Digits |
| Pre-standardized “Square Body” era. Explictly captures Division (C = Chevy, T = GMC) and Body Style 2 for open-utility utility vehicles (Blazer/Jimmy). |
| 1981–1987 | 17 Characters |
| Standardized modern formatting. WMIs beginning with 1GC flag Chevrolet Truck/SUV and 1GT flag GMC. Character 8 in position 6 identifies Blazer/Jimmy models. |
Shared Assembly Plant Codes Quick Reference
When verifying your truck’s manufacturing origin, check the plant position code against these historical GM truck assembly facilities:
A: Atlanta, Georgia
B: Baltimore, Maryland
C: South Gate, California / Cheyenne
F: Flint, Michigan
H / Z: Fremont, California
J: Janesville, Wisconsin
K: Kansas City, Missouri
N: Norwood, Ohio
P / V: Pontiac, Michigan
S: St. Louis, Missouri
T: Tarrytown, New York
1: Oshawa, Ontario, Canada
Decoding your classic Chevy or GMC truck, Blazer, or Jimmy VIN is the most reliable way to strip away decades of guesswork and find out exactly how your vehicle rolled off the assembly line. Whether you are hunting down correct replacement parts, checking the authenticity of a rare powertrain option, or documenting a total “Square Body” or “Action Line” restoration project, a clear understanding of your vehicle’s identity is important and tells part of its history.
If you need more help decoding your VIN, or looking for parts for your C10, hop on SS396.com or give our friendly techs a call at (203) 235-1200!
