Description
Factory GMC Sierra Workshop Manual (1998-2007)
This factory-level repair manual covers the second-generation GMC Sierra (GMT800 platform) sold in the US market from 1998 through 2007, spanning Light Duty 1500 through Heavy Duty 3500 models across all cab styles and trim grades including Denali.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Gasoline | 4.3L V6 Vortec (LU3), 4.8L V8 Vortec (LR4), 5.3L V8 Vortec (LM7, L59, LM4), 6.0L V8 Vortec (LQ4, LQ9), 8.1L V8 Vortec (L18) |
| Diesel | 6.6L Duramax V8 (LB7, LLY, LBZ) |
| Transmissions | 4L60E, 4L65E, 4L80E automatics; Allison 1000 automatic; NV3500 5-speed manual; NV4500 5-speed manual; NV5600 6-speed manual |
| Drive | RWD (2WD) and 4WD |
| Model Years | 1998-2007 |
| Badge Twins | Chevrolet Silverado (GMT800 platform) |
Common Sierra Repairs Covered
| System | Procedures |
|---|---|
| 4L60E Transmission | Harsh shift diagnosis, TCC solenoid replacement, full rebuild with torque specs |
| Duramax Fuel System | LB7 injector replacement (known high-pressure injector failure), fuel filter service, CP3 pump inspection |
| Front Suspension | Upper ball joint replacement (known wear issue on 4WD trucks), torsion bar adjustment, alignment specs |
| Electrical / HVAC | Blower motor resistor replacement (common HVAC failure), wiring diagram tracing, trailer tow connector repair |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Which Sierra trim levels and cab configurations does this manual cover?
All trim levels are included – Work Truck, SLE, SLT, and Denali – across Regular Cab, Extended Cab, and Crew Cab body styles. Both the late GMT400 (1998) and the full GMT800 generation (1999-2007) are addressed within the same manual.
Is the GMC Sierra GMT800 related to the Chevrolet Silverado?
Yes. The Sierra and Silverado share the GMT800 platform and are badge twins with largely identical powertrains and chassis architecture. Procedures in this manual are directly applicable to the equivalent Silverado model year for any shared component.
Does the manual cover the 6.6L Duramax diesel in detail?
Full Duramax diesel coverage is included for all three engine variants sold during this period – the LB7 (2001-2004), LLY (2004.5-2005), and LBZ (2006-2007) – with the LB7 injector replacement procedure specifically documented, a notoriously complex repair on these trucks.
What format is the manual?
The manual is a PDF file delivered immediately after purchase. It is fully searchable, zoomable for detailed diagrams, and readable on any Windows, Mac, iOS, Android, or Linux device. Individual pages or entire sections can be printed for shop use.
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