2008 GMC W4500 Forward Service and Repair Manual
This factory service and repair manual for the 2008 GMC W4500 Forward covers the low-tilt straight truck in its W4S042 build, with two engines documented to the same depth. One is a turbocharged 5.2L inline-four diesel of 317 cubic inches; the other is a naturally aspirated 6.0L overhead-valve V8 of 364 cubic inches running gasoline. Rather than separate the book by drivetrain, it follows the truck: engine and fuel, cooling, transmission and driveline, brakes, steering and suspension, cab and body, and electrical, each with its own procedures, specifications, torque values, wiring diagrams and diagnostics.
Engines covered
- 6.0L V8 (364 cu in) — OHV, naturally aspirated, gasoline
- 5.2L inline-four (317 cu in) — turbocharged, diesel
Body styles covered
- Straight truck, low tilt
Trims covered
- W4S042
Known issues on the 2008 W4500 Forward. The federal record for the 2008 W4500 Forward is clean, with no recalls and no owner complaints logged at NHTSA. The manual's usefulness is in ordinary service, and there is plenty of it on a working cabover: injection and turbocharger specifications on the 5.2L diesel, fuel and ignition figures on the 6.0L V8, cooling and lubrication procedures, clutch and transmission work, cab tilt hardware, brake and steering repair with torque values, and wiring diagrams tied to diagnostic charts for the truck's circuits.
