1983 GMC C2500 Service and Repair Manual

This factory service and repair manual for the 1983 GMC C2500 documents six engines in a truck sold three ways: as a four-door crew cab pickup, a two-door standard cab pickup or a two-door cab and chassis. Two inline-sixes, the 4.1L and the 4.8L, sit at the bottom of the range; the 5.0L, 5.7L and 7.4L V8s cover the gasoline middle and top; and the 6.2L V8 is the diesel. Trims are Base, High Sierra and Sierra Classic, and every engine is overhead-valve and naturally aspirated.

Engines covered

• 5.0L V8 (305 cu in) — OHV, naturally aspirated, gasoline
• 4.1L inline-six (250 cu in) — OHV, naturally aspirated, gasoline
• 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
• 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
• 4.8L inline-six (292 cu in) — OHV, naturally aspirated, gasoline
• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door crew cab pickup
• 2-door standard cab pickup
• 2-door cab & chassis

Trims covered

• Base
• High Sierra
• Sierra Classic

Known issues on the 1983 C2500. The manual covers the truck as delivered, and with six engines that is a substantial job on its own: valve, timing, fueling and cooling specifications for each of them, plus the transmission, axle, brake, steering and suspension procedures shared across the range, and the wiring diagrams and diagnostic charts for the electrical system.