How to Restore Your Chevy Truck: 1973-1987. Kevin Whipps
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The 1973–1987 Chevy/GMC truck line uses a conventional 13-digit VIN system. The VIN system changed three times during the course of the Squarebody truck production run.
1973–1978 VIN Designations
First Digit: Division
C | Chevrolet |
T | GMC |
Second Digit: Chassis Type
C | Two-wheel-drive |
G | Light Duty, Forward Control |
K | Four-wheel-drive |
P | Forward Control |
Third Digit: Engine
Y | V-8, 454 ci, 4-barrel carburetor (P Models) |
S | V-8, 454 ci, 4-barrel carburetor (C Models) |
R | V-8, 400 ci, 4-barrel carburetor |
L | V-8, 350 ci, 4-barrel carburetor |
U | V-8, 305 ci, 2-barrel carburetor |
T | Inline-6, 292 ci, 1-barrel carburetor |
D | Inline-6, 250 ci, 1-barrel carburetor |
Fourth Digit: Series
1 | 1/2 Ton |
2 | 3/4 Ton |
3 | 1 Ton |
4 | Heavy Half/Big 10 |
Fifth Digit: Body Style
2 | Forward Control Chassis Only |
3 | Cab-Chassis |
4 | Pickup and Van |
5 | Panel |
6 | Suburban |
7 | Motorhome |
8 | Utility |
Sixth Digit: Model Year
3 | 1973 |
4 | 1974 |
5 | 1975 |
6 | 1976 |
7 | 1977 |
8 | 1978 |
Seventh Digit: Assembly Plant
A | Lakewood |
B | Baltimore |
F | Flint |
J | Janesville |
V | GM Truck-Pontiac |
S | St. Louis |
U | Lordstown |
F | Freemont |
1 | Oshawa |
3 | GMAD Detroit |
4 | Scarborough |
Remaining Digits
The remaining digits are a sequential serial number, unique to the truck.
1979–1980 VIN Designations
First Digit: Division
C | Chevrolet |
T | GMC |
Second Digit: Chassis Type
C | Two-wheel-drive |
K | Four-wheel-drive |
Third Digit: Engine
D | Inline-6, 250 ci |
L | V-8, 350 ci |
R | V-8, 400 ci |
T | Inline-6, 292 ci |
Fourth Digit: Series
1 | 1/2 Ton |
2 | 3/4 Ton |
3 | 1 Ton |
4 | Heavy Half/Big 10 |
Fifth Digit: Body Type
3 | Cab-Chassis |
4 | Pickup |
Sixth Digit: Model Year
9 | 1979 |
A | 1980 |
Seventh Digit: Assembly Plant
A | GMAD-Lakewood |
B | GMAD-Baltimore |
D | GMAD-Doraville |
F | Chevrolet-Flint |
J | GMAD-Janesville |
K | GMAD-Leeds |