This factory service and repair manual for the 1998 GMC W5500 Forward covers a low tilt straight truck built in a single trim, W5R042, with a single diesel engine: the turbocharged 7.1L inline-six displacing 435 cubic inches. Because that combination is the whole model range, the book can be organized by system instead of by variant, and a technician looking for a specification, a torque value or a diagnostic sequence lands on the right page without first identifying which build is on the lift.
Engines covered
- 7.1L inline-six (435 cu in) — turbocharged, diesel
Body styles covered
- Straight truck, low tilt
Trims covered
- W5R042
Known issues on the 1998 W5500 Forward. Federally, the 1998 W5500 Forward has no recalls against it and no owner complaints recorded with NHTSA. That leaves the manual doing what it was written to do rather than remedying a known fault, carrying procedures and specifications for the turbocharged 7.1L inline-six, torque values for the assemblies around it, and complete wiring diagrams for tracing electrical faults on the W5R042 chassis.
