This factory service and repair manual for the 1987 GMC W7500 Forward serves a truck available with either of two turbocharged inline-six diesels: an 8.4L of 513 cubic inches or a 5.8L of 353. Body and trim coverage is single, the low tilt straight truck in W7R042 form. The engine chapters are the part of the book that branches, while the chassis and electrical sections apply across both, with shared specifications, torque values and wiring diagrams.
Engines covered
- 8.4L inline-six (513 cu in) — turbocharged, diesel
- 5.8L inline-six (353 cu in) — turbocharged, diesel
Body styles covered
- Straight truck, low tilt
Trims covered
- W7R042
Known issues on the 1987 W7500 Forward. The 1987 W7500 Forward carries a clean federal record: no recalls have been issued and no owner complaints appear with NHTSA. In that situation the manual is a working tool rather than a corrective one, giving diagnostics and procedures for whichever of the two turbocharged sixes is installed, the specifications each was built to, and the torque values and wiring diagrams for the truck around it.
