2009 GMC W4500 Forward Service and Repair Manual

This factory service and repair manual for the 2009 GMC W4500 Forward covers two bodies under one build code: a low crew cab straight truck and a low-tilt straight truck, both listed as W4S042. Power comes from a naturally aspirated 6.0L overhead-valve V8 of 364 cubic inches on gasoline or a turbocharged 5.2L inline-four of 317 cubic inches on diesel. The crew cab adds structure, seating and wiring to service, and the manual carries procedures, specifications, torque values, wiring diagrams and diagnostics for both bodies as well as both engines.

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 crew cab
• Straight truck, low tilt

Trims covered

• W4S042

Known issues on the 2009 W4500 Forward. The manual is where the year's real detail sits: engine mechanical, fuel and cooling specifications for the 5.2L turbodiesel and the 6.0L gasoline V8, transmission and driveline procedures, brake, steering and suspension repair with the torque values each joint needs, cab tilt and crew-cab body work, and wiring diagrams paired with diagnostics that move from symptom to circuit.