| 1988 | GMC | K3500 | Sierra SLE Cab & Chassis 2-Door | 7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra SLX Cab & Chassis 2-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra Cab & Chassis 2-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra SLX Standard Cab Pickup 2-Door | 7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | High Sierra Cab & Chassis 4-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Base Cab & Chassis 2-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | High Sierra Cab & Chassis 2-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Sierra Classic Crew Cab Pickup 4-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra Extended Cab Pickup 2-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra SLX Cab & Chassis 2-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Sierra Classic Standard Cab Pickup 2-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra Cab & Chassis 2-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | High Sierra Standard Cab Pickup 2-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | High Sierra Standard Cab Pickup 2-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Base Standard Cab Pickup 2-Door | 7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | K3500 | Sierra SLE Standard Cab Pickup 2-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | High Sierra Cab & Chassis 4-Door | 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Sierra Classic Cab & Chassis 2-Door | 7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Sierra Classic Crew Cab Pickup 4-Door | 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated |  | 
| 1988 | GMC | V3500 | Base Standard Cab Pickup 2-Door | 4.8L 292Cu. In. l6 GAS OHV Naturally Aspirated |  |