4th digit - Gross Vehicle Weight Rating (GVWR) |
| A | 0-3,000 lbs. |
| B | 3,001-4,000 lbs. |
| C | 4,001-5,000 lbs. |
| D | 5,001-6,000 lbs. |
| E | 6,001-7,000 lbs. |
| F | 7,001-8,000 lbs. |
| G | 8,001-9,000 lbs. |
| H | 9,001-10,000 lbs. |
| J | 10,001-14,000 lbs. |
| K | 14,001-16,000 lbs. |
| L | 16,001-19,500 lbs. |
| M | 19.501-26,000 lbs. |
|
| 5th digit - line/chassis type |
| B | incomplete |
| C | 4×2 full-size pickup |
| E | 4×2 compact pickup |
| G | 4×2 minivan |
| H | cutaway chassis |
| J | 4×4 compact pickup |
| K | 4×4 full-size pickup |
| L | 4×4 minivan |
| M | 4×2 minivan |
| P | forward control chassis |
| R | 4×2 full-size pickup |
| S | 4×2 sport-utility |
| T | 4×4 sport-utility |
| U | 4×2 APV |
| V | 4×4 full-size pickup |
| W | Chevrolet El Camino |
| X | 4×4 APV |
|
| 6th digit - series |
| 1 | ½ ton & 1500 |
| 2 | ¾ ton & 2500 |
| 3 | 1 ton & 3500 |
| 4 | ½ ton heavy duty |
| 5 | 3 ton (GMC Mexico only) |
| 6 | ½ ton Luxury & 1500 Luxury |
| 7 | ¾ ton Luxury & 2500 Luxury |
| 8 | 1 ton Luxury & 3500 Luxury El Camino |
| 9 | incomplete |
| 0 | extended wheelbase minivan |
|
| 7th digit - body type |
| 1 | cutaway van |
| 2 | forward control |
| 3 | four-door cab |
| 4 | two-door cab |
| 5 | van |
| 6 | Suburban |
| 7 | motor home chassis |
| 8 | two-door sport-utility |
| 9 | extended cab stake/platform |
| 0 | chassis only sedan pickup |
|
| 8th digit - engine
| | A | LD5 | 6 cyl. 3.8L (231 c.i.d.) |
| C | L34 | 8 cyl. 6.2L (378 c.i.d.) diesel 4 cyl. 2.0L (122 c.i.d.) fuel injected |
| D | LE3 | 6 cyl. 4.1L (250 c.i.d.) |
| E | LA1 | 6 cyl. 3.4L (207 c.i.d.) fuel injected |
| F | LF3 L65 | 8 cyl. 5.0L (305 c.i.d.) 4 barrel carburetor 8 cyl. 6.5L (396 c.i.d.) turbo diesel |
| G | LG9 L18 | 8 cyl. 5.0L (305 c.i.d.) 2 barrel carburetor 8 cyl. 8.1L (494 c.i.d.) fuel injected |
| H | LE9 LN1 | 8 cyl. 5.0L (305 c.i.d.) 4 barrel carburetor 85 KW, 312 volt electric |
| J | L39 L29 | 8 cyl. 4.4L (267 c.i.d.) 8 cyl. 6.2L (378 c.i.d.) diesel 8 cyl. 7.4L (451 c.i.d.) fuel injected |
| K | LC3 | 6 cyl. 3.8L (229 c.i.d.) 8 cyl. 5.7L (350 c.i.d.) EFI |
| L | LS9 LH3 | 8 cyl. 5.7L (350 c.i.d.) 6 cyl. 4.1L (250 c.i.d.) fuel injected |
| M | LT9 L30 | 8 cyl. 5.7L (350 c.i.d.) 8 cyl. 5.0L (305 c.i.d.) |
| N | | 8 cyl. 5.7L (350 c.i.d.) diesel 8 cyl. 7.4L (454 c.i.d.) EFI |
| P | LF5 | 8 cyl. 5.7L (350 c.i.d.) 8 cyl. 6.5L (396 c.i.d.) diesel |
| R | L31 | 8 cyl. 5.7L (347 c.i.d.) |
| S | | 8 cyl. 7.4L (454 c.i.d.) 8 cyl. 6.5L (396 c.i.d.) diesel |
| T | L25 LM7 | 5 cyl. 4.8L (292 c.i.d.) 8 cyl. 5.3L (323 c.i.d.) fuel injected |
| U | LQ4 | 8 cyl. 6.0L (366 c.i.d.) fuel injected |
| V | LR4 | 8 cyl. 4.8L (292 c.i.d.) fuel injected |
| W | LE8 L35 | 8 cyl. 7.4L (454 c.i.d.) 6 cyl. 4.3L (262 c.i.d.) CPI |
| X | LF6 | 6 cyl. 4.3L (262 c.i.d.) |
| Y | LD8 L57 | 8 cyl. 4.6L (280 c.i.d.) fuel injected automobile engine 8 cyl. 6.5L (396 c.i.d.) diesel |
| Z | LF9 | 8 cyl. 5.7L (350 c.i.d.) diesel ? cyl. 4.3L (263 c.i.d.) EFI |
| 4 | LN2 | 4 cyl. 2.2L (134 c.i.d.) fuel injected |
| 5 | L43 | 4 cyl. 2.2L (134 c.i.d.) Compatible Fuel Vehicle |
| 6 | L01 | 4 cyl. 1.6L (97 c.i.d.) fuel injected |
| 9 | L37 | 8 cyl. 4.6L (280 c.i.d.) fuel injected |
|
| 11th digit - assembly plant |
| A | Lakewood, Ohio | |
| B | Baltimore, Maryland Lansing, Michigan | Truck & Bus Genasys |
| C | Lansing, Michigan | |
| D | Doraville, Georgia | |
| E | Pontiac East, Michigan | Truck & Bus |
| F | Fairfax, Kansas Flint, Michigan | Fairfax II Truck & Bus |
| G | Silao, Mexico | |
| H | Flint, Michigan | |
| J | Janesville, Wisconsin | Truck & Bus |
| K | Linden, New Jersey Keeds, Alabama | Truck & Bus |
| M | Lansing, Michigan Toluca, Mexico | |
| R | Arlington, Texas Russelsheim, Germany | Truck & Bus |
| S | St. Louis, Missouri Ramos Arizpe, Mexico | |
| T | Terrytown, Louisiana | |
| U | Hamtramck, Michigan | |
| V | Pontiac, Michigan | Truck & Bus |
| Y | Wilmington, Delaware | |
| Z | Fremont, California Fort Wayne, Indiana Spring Hill, Tennesee | Truck & Bus Saturn |
| 1 | Scarborough, Ontario Oshawa, Ontario Wentzville, Missouri | #2 Truck & Bus |
| 2 | Moraine, Ohio St-Therese, Québec | Truck & Bus |
| 3 | St-Eustache, Québec Kawasaki, Japan | Diesel Division |
| 4 | Orion, Michigan | |
| 5 | London, Ontario Bowling Green, Kentucky | Diesel Division Corvette |
| 6 | Oklahoma City, Oklahoma Ingersoll, Ontario | |
| 7 | Lordstown, Ohio Fujisawa, Japan | |
| 8 | Shreveport, Louisiana Tillsonburg, Ontario | Truck & Bus Canexpo |
| 9 | Oshawa, Ontario | #1 |
| 0 | Lansing, Michigan | |
|