This factory service and repair manual for the 1990 GMC C6000 covers one body style, the 2-door conventional cab and chassis, and one trim code, C6D042, but four engines. Three are naturally aspirated gasoline units — the 6.0L overhead-valve V8 of 366 cubic inches, the 7.0L V8 of 427 cubic inches and the 5.7L V8 of 350 cubic inches — and the fourth is the naturally aspirated 8.2L diesel V8 of 501 cubic inches. The engine sections are kept apart so the specifications, torque values and diagnostics for one are never mistaken for another's.
Engines covered
- 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
- 7.0L V8 (427 cu in) — 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
Trims covered
- C6D042
Known issues on the 1990 C6000. NHTSA's records on the 1990 C6000 are empty: no recalls and no owner complaints for the year. What the manual offers instead is the detail needed to keep four different engines running in the same chassis, from the 350 V8 up to the 427 and the 8.2L diesel. Specifications, service procedures and torque values are given for each, and the conventional cab and chassis they share is documented with its own procedures, wiring diagrams and diagnostic sequences.
