This factory service and repair manual for the 1999 GMC T6500 covers a diesel-only pairing: a 7.2L turbocharged inline-six of 441 cubic inches with overhead valves, and a larger 7.8L turbocharged inline-six of 475 cubic inches. One chassis designation, F6B042, applies to both. The manual separates their specifications and torque values, then carries the same system-by-system treatment through the driveline, brakes, steering, chassis and body, with wiring diagrams and diagnostic procedures written for a medium-duty truck rather than a light one.
Engines covered
- 7.2L inline-six (441 cu in) — OHV, turbocharged, diesel
- 7.8L inline-six (475 cu in) — turbocharged, diesel
Trims covered
- F6B042
Known issues on the 1999 T6500. NHTSA lists neither a recall nor an owner complaint against this model year, so the federal record is clean. Coverage therefore stands on the ordinary material: the 7.2L and 7.8L turbocharged diesel sixes, each with their own specifications, torque values and diagnostic routines, and the chassis, driveline, brake, steering and body systems around them. Wiring diagrams complete it, which is what makes a fault with no recall history behind it something a technician can chase from symptom back to circuit.
