1998 GMC C3500HD Service and Repair Manual
This factory service and repair manual for the 1998 GMC C3500HD divides neatly in two, because the chassis does: the two-door conventional cab and chassis and the four-door crew cab version, both Base trim, and the turbocharged 6.5L diesel V8 or the naturally aspirated 7.4L gasoline V8. Engine, fueling and cooling coverage is written separately for the diesel and the gasoline V8, while the transmission, axles, brakes, steering, suspension and electrical systems are documented once, with procedures, specifications, torque values, wiring diagrams and diagnostics.
Engines covered
- 6.5L V8 (395 cu in) — OHV, turbocharged, diesel
- 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 2-door cab & chassis, conventional
- 4-door cab & chassis, crew cab
Trims covered
- Base
Known issues on the 1998 C3500HD. One owner complaint is held by NHTSA for this model year, and it concerns the fuel system. That is a single data point, but fuel faults on a working chassis tend to strand it, so the relevant sections are worth knowing. The manual covers tank, lines and delivery hardware, pressure and flow specifications for both engines, the priming and air-bleeding steps the diesel needs, and diagnostic procedures with wiring diagrams for the sensors and controls that manage fueling.
