Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Model Identification
Truck models, listed in tables, are identified using manufacturer's letter and number designations. The letters identify vehicle model series (i.e., "C" is conventional chassis, including Pickup, Blazer and Suburban). The number reference identifies the vehicles load capacity. Refer to following charts for actual letter and number designations.
| Vehicle Series | I.D. Letter |
|---|---|
| Conventional Chassis (2WD) | C |
| Conventional Chassis (2WD) | S |
| Conventional Chassis (4WD) | K |
| Conventional Chassis (4WD) | T |
| Conventional Van Chassis | G |
| Forward Control/Step Van Chassis | P |
| Astro & Safari Vans | M |
| Chevrolet Number | GMC Number | Ton Capacity |
|---|---|---|
| 10 | 1500 | 1/2 |
| 20 | 2500 | 3/4 |
| 30 | 3500 | 1 |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.