1986 GMC C2500 Service and Repair Manual

This factory service and repair manual for the 1986 GMC C2500 covers four bodies, the standard cab pickup, the extended cab pickup, the crew cab pickup and the cab and chassis, in Base, High Sierra and Sierra Classic trim. Six engines are documented: the 4.3L V6, the 4.8L inline-six, the 5.0L, 5.7L and 7.4L gasoline V8s and the 6.2L diesel V8. Body and interior procedures differ from one cab to the next, while the engine, driveline and chassis sections are common to all of them.

Engines covered

• 5.0L V8 (305 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
• 4.3L V6 (262 cu in) — OHV, naturally aspirated, gasoline
• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 2-door extended cab pickup
• 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 1986 C2500. The manual stands on its coverage, which has to reach from the 4.3L V6 and the 4.8L inline-six through three gasoline V8s to the 6.2L diesel, and from a bare cab and chassis to a crew cab pickup. Procedures, specifications, torque values, wiring diagrams and diagnostics are given system by system for all of them.