GM Full-Size Trucks 1980-1987 Repair Guide

Vehicle

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See Figures 1, 2 and 3

The Vehicle Identification Number (VIN) is on a plate attached to the left hand door pillar, or on the left top of the dashboard (visible through the windshield) on later models. The gross vehicle weight (GVW), or maximum safe total weight of the truck, cargo, and passengers, is also given on the plate.



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Fig. Fig. 1: Vehicle identification plate

1980 MODELS



The VIN is on a plate attached to the upper left hand side of the instrument panel. The first letter indicates a Chevrolet (C) or GMC (T) vehicle. The second letter is the drive type, "C" for two wheel drive or "K" for four wheel drive. The third letter is the engine type. 1980 engine letter codes are as follows:



1980 ENGINE CODES
 
D: 250 Six
 
T: 292 Six
 
U: 305 V8
 
M: 350 V8 2 barrel
 
L: 350 V8 4 barrel
 
R: 400 V8
 
S: 454 V8
 
Z: 350 V8 Diesel
 

The first and the fourth digits in the VIN is the GVW range, 1 ( 1 /2 ton), 2 ( 3 /4 ton), 3 (1 ton) and 4 ( 1 /2 ton HD susp). The second number and fifth digit in the VIN designates the model or body style type, they are:



1980 BODY STYLES
 
2: Chassis Cowl, Forward control Chassis
 
3: Chassis Cab
 
4: Cab and Pick Up Box or Hi-Cube Van
 
5: Chevy Van and Step Van
 
6: Sport Van and Suburban
 
7: Motor Home Chassis
 
8: Blazer
 

The fourth letter and sixth digit in the VIN designates the model year, " A " for 1980, for example. The fifth letter and seventh digit indicates the assembly plant where the truck was assembled.



1980 ASSEMBLY PLANTS
 
A: GMAD Lakewood GA
 
B: GMAD Baltimore MD
 
F: Chevrolet Flint MI
 
J: GMAD Janesville WI
 
S: GMAD St. Louis MO
 
Z: GMAD Freemont CA
 
O: GM Truck Pontiac MI
 
1: GM of Canada Oshawa Ont.
 
3: Chevrolet Detroit MI
 
4: GM of Canada Scarborough OH
 
7: GMAD Lordstown OH
 

The last six numbers in the VIN number are the sequential serial number.

1981 AND LATER MODELS



Beginning in 1981 a new 17 digit code is used. The interpretation is the same as previous years except that the engine code is the eighth digit. Additional engine codes include the F and H codes, 305 V8; P code, 350 V8; W code 454 V8; C and J codes, a Chevrolet built 379 cu. in. V8 diesel.



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Fig. Fig. 2: 17-digit VIN, 1981 and later



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Fig. Fig. 3: Engine Identification Codes by VIN Number 1981-1987

 
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