The VIN (Vehicle Identification Number) plate is the primary identification tag for any F-100 truck. Its location and format changed across generations, which is important to know when verifying a truck’s identity or researching its history. On early F-100s (1948-1952), the serial number plate is typically found on the left door pillar. Later models moved the VIN plate to the driver’s side dashboard, visible through the windshield, following federal standardization.
The VIN format also evolved over time. Pre-1981 trucks used varying formats that encode the model year, assembly plant, engine type, and sequential production number but in shorter, less standardized configurations. Starting in 1981, the industry adopted the modern 17-character VIN system, though this only applies to the very last F-100 model years (1981-1983).
When buying an F-100, verifying the VIN plate is essential. Check that the plate appears original and has not been tampered with, and compare the VIN to the title and other identification tags. A matching-numbers truck where the VIN corresponds to the original engine stampings is worth more than one with replaced components. The VIN is also your starting point for researching original specifications through Ford decoder tools available online.