Truck VIN Decoder & GVWR Specification Lookup
Verify cab style, bed configuration, engine displacement, GVWR weight class, and assembly plant for pickups and commercial trucks.
Deciphering Truck Weight Ratings and Cab Configurations
Truck VINs feature complex coding structures tailored to commercial gross vehicle weight ratings (GVWR), towing capabilities, and powertrain options. Knowing how to decode a truck VIN ensures you are purchasing a vehicle that matches your legal payload requirements and commercial licensing limits.
Federal Commercial Truck Classes (Class 1 through Class 8)
The United States Department of Transportation classifies all trucks into eight distinct weight classes based on maximum operating weight:
| GVWR Class | Weight Range | Representative Truck Models |
|---|---|---|
| Class 1 | 0 – 6,000 lbs | Ford Maverick, Toyota Tacoma, Chevy Colorado |
| Class 2 | 6,001 – 10,000 lbs | Ford F-150 / F-250, Chevy Silverado 1500 / 2500, Ram 1500 |
| Class 3 | 10,001 – 14,000 lbs | Ford F-350, Chevy Silverado 3500HD, Ram 3500 (Dually) |
| Class 4 | 14,001 – 16,000 lbs | Ford F-450, Ram 4500, Isuzu NPR |
| Class 5 | 16,001 – 19,500 lbs | Ford F-550, Ram 5500, Peterbilt 325 |
| Class 6 | 19,501 – 26,000 lbs | Ford F-650, International MV, Freightliner M2 106 |
| Class 7 | 26,001 – 33,000 lbs | Ford F-750, Peterbilt 337, Kenworth T370 |
| Class 8 | 33,001+ lbs | Peterbilt 389, Kenworth W900, Freightliner Cascadia |
Cab and Bed Designations Encoded in Truck VINs
Positions 4 through 6 indicate whether the truck was originally assembled as:
- Regular Cab: Single-row seating with two full doors.
- Extended Cab (SuperCab / Double Cab / Quad Cab): Two full front doors with rear reverse-opening or compact half-doors.
- Crew Cab (SuperCrew / Mega Cab): Four full-sized, front-hinged passenger doors with maximum rear legroom.
- Chassis Cab: Sold without a bed, engineered for aftermarket service bodies, flatbeds, dump beds, or towing rigs.
Frequently Asked Questions
Federal regulation 49 CFR Part 565 mandates that truck manufacturers encode GVWR weight classes (Classes 1 through 8) into positions 4 through 7 of the VIN. This identifies whether a truck is a light-duty (Class 1–2, e.g. F-150), medium-duty (Class 3–6, e.g. F-350 / F-550), or heavy commercial vehicle (Class 7–8, e.g. semi-tractors).
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