2001 GMC W3500 Forward Service and Repair Manual

This factory service and repair manual for the 2001 GMC W3500 Forward exists because one chassis has to be serviced two ways. Order the gasoline truck and it arrives with a 350-cubic-inch 5.7L V8, overhead-valve and naturally aspirated; order the diesel and it is a turbocharged 4.8L inline-four of 290 cubic inches. The build code is W3S042 either way. The manual keeps the shared systems — brakes, steering, driveline, cab and electrical — in one set of chapters and gives each engine its own procedures, specifications, torque values, wiring diagrams and diagnostics.

Engines covered

• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
• 4.8L inline-four (290 cu in) — turbocharged, diesel

Trims covered

• W3S042

Known issues on the 2001 W3500 Forward. The manual is a thorough maintenance and repair reference: engine specifications and torque values for both the 4.8L turbodiesel and the 5.7L gasoline V8, transmission and driveline procedures, brake and steering service, cab and chassis wiring diagrams, and diagnostics organized so a symptom leads to the right system instead of a parts-swapping exercise.