1988 GMC C6000 Service and Repair Manual

This factory service and repair manual for the 1988 GMC C6000 documents a medium-duty truck sold in two shapes, a 2-door conventional cab and chassis and a medium conventional tractor, both under trim code C6D042. Three engines are covered. Two are naturally aspirated gasoline V8s, the 6.0L overhead-valve unit of 366 cubic inches and the 5.7L of 350 cubic inches; the third is the naturally aspirated 8.2L diesel V8 of 501 cubic inches. Each has its own specifications, procedures and torque values, with shared chassis and wiring coverage behind them.

Engines covered

• 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
• 5.7L V8 (350 cu in) — naturally aspirated, gasoline
• 8.2L V8 (501 cu in) — naturally aspirated, diesel

Body styles covered

• 2-door cab & chassis, conventional
• Tractor truck, medium conventional

Trims covered

• C6D042

Known issues on the 1988 C6000. A truck built for tractor and chassis-cab duty tends to accumulate wear in its driveline, and the manual is organized for exactly that kind of work: engine specifications and procedures for the two gasoline V8s and the 8.2L diesel, torque values for the fasteners involved, wiring diagrams for the cab and chassis circuits, and diagnostics that start from a symptom.