| Digit | Usage | VIN | Decoded | |
|---|---|---|---|---|
| 1-2 | Model Code | M5 | Unknown! | |
| 3 | Body | 0 | Forward Control&Motorhome Chassis, Incomplete Chassis, CB300/400 Caravan, Sport Utility | |
| 4 | Gross Vehicle Weight | C | 10,001 - 14,000 lbs | |
| 5 | Engine | A | V8 440 | |
| 6 | Year | 9 | 1979 | |
| 7 | Plant | T | Warren MI Truck #2 (Heavy Duty) | |
| 8-13 | Sequential Serial # | 507057 | 507057 |