🏷️ Basic Information Identification Make: GMC Model: Sierra 2500 Year: 2004 Codes Platform: GMT880 Generation Generation: Second Generation (GMT800) 👋 Introduction Market Position Target Audience: DIY enthusiasts, Independent Repair Shops, Fleet Maintenance Personnel Competitive Analysis Advantages Over Print: Instant access, searchable content, cross-device compatibility, easier updates, often more cost-effective than multiple printed manuals. Key Features Content Source: Licensed information derived from OE (Original Equipment) materials by RepairSurge. Usability: User-friendly interface, push-button access to information, step-by-step procedures. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Additional Coverage: Maintenance, Diagnostics, Troubleshooting, Electrical Schematics, Component Replacement, Specifications Page Count Estimated Page Count: Varies by specific content, typically thousands of pages in OE equivalent Manual Type Manual Type: Software (Online Service and Repair Manual) Language Language: English Format Format: Digital Access (Web-based, PC/Laptop/Smartphone/Tablet compatible) 📖 Manual Coverage Systems Covered Engine: All gasoline and diesel engines (e.g., 6.0L V8 Vortec, 8.1L V8 Vortec, 6.6L Duramax Diesel) Transmission: Automatic transmissions (e.g., 4L80-E, Allison 1000), Manual transmissions (if applicable) Drivetrain: Front and Rear Axles, Differentials, Driveshafts, Transfer Case (4WD) Suspension: Front Independent Suspension (Torsion Bar), Rear Leaf Spring Suspension, Steering Components Brakes: Hydraulic Brake System, ABS, Parking Brake Electrical: Wiring Diagrams, Lighting, Power Accessories, Starting and Charging System, ECM/PCM Body And Chassis: Body Panels, Doors, Seats, Bumpers, Frame, Glass HVAC: Heating, Ventilation, and Air Conditioning (HVAC) System Fuel System: Fuel Pump, Injectors, Lines, Tank Cooling System: Radiator, Fan, Water Pump, Hoses, Thermostat Procedures Included Maintenance Procedures: Oil and Filter Changes, Fluid Top-offs, Tire Rotations, Spark Plug Replacement, Air Filter Replacement Diagnostic Procedures: Troubleshooting Charts, OBD-II Diagnostics, Component Testing Repair Procedures: Engine Mechanical Repairs, Transmission Overhauls, Brake Pad/Rotor Replacement, Suspension Component Replacement, Electrical Component Diagnosis and Replacement Installation Procedures: Component Installation and Replacement (e.g., alternator, starter, water pump) Schematics: Detailed Electrical Wiring Diagrams for all systems Technical Depth Depth Of Coverage: Comprehensive, from basic scheduled maintenance to complete engine/transmission rebuilds and complex electrical diagnostics. Diagnostics Level: Advanced diagnostics including symptom-based troubleshooting and component testing with specifications. Rebuild Information: Detailed instructions for major component rebuilds, including torque specifications and clearances. 📊 Manual Specifications File Format Software Platform: Web Browser Access Accessibility: Accessible on any device with an internet connection and web browser. Print Quality Print Capability: Pages can be printed from the web interface, quality depends on user's printer. Binding Type Binding: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) Licensing Licensing Status: Officially Licensed, OE Material Derived Access Duration Subscription Period: 1 Year (with options for extension discounts) ⚙️ Engine Specifications Primary Engine Engine Options: 4.8L V8 Vortec, 5.3L V8 Vortec, 6.0L V8 Vortec, 8.1L V8 Vortec, 6.6L Duramax V8 Turbo Diesel (LB7) Performance Horse Power Range: Approx. 255-300 hp for gasoline, 300 hp for Duramax Torque Range: Approx. 285-330 lb-ft for gasoline, 520 lb-ft for Duramax Fuel System Fuel Delivery Gasoline: Multi-port Fuel Injection (MPFI) Fuel System Diesel: High-pressure Common Rail Injection (Duramax LB7) Ignition System Ignition Type: Distributorless Ignition System (DIS) with Coil-on-Plug (COP) for Vortec engines 🔧 Transmission Standard Standard Transmission: 4-speed automatic (e.g., 4L60E for lighter duty 2500, 4L80E for heavy duty 2500) Optional Optional Transmission: 5-speed Allison 1000 automatic (primarily with Duramax diesel), 5-speed manual (less common) Features Transmission Features: Electronic controls, Tow/Haul mode (on automatics), Lock-up torque converter 📐 Dimensions Exterior Body Styles: Regular Cab, Extended Cab, Crew Cab Bed Lengths: Short Bed (approx. 6.5 ft), Long Bed (approx. 8 ft) Weights Curb Weight Range: Approx. 5,500 - 7,000 lbs (depending on configuration) Gross Vehicle Weight Rating Gvwr: Up to 8,600 lbs (2500 series, depending on configuration) 🛡️ Safety Features Ratings NHTSA Front Impact Rating: 4-Star (Driver), 5-Star (Passenger) - Check specific configurations IIHS Front Offset Crash Test: Good (for models tested, typically up to 2003 for this generation, 2004 data may vary) Active Features Active Safety: Anti-lock Braking System (ABS), Available StabiliTrak (on some models) Passive Features Passive Safety: Driver and Passenger Front Airbags, Available Side Curtain Airbags (on some models) 💡 Technology Features Infotainment Infotainment System: Base AM/FM stereo, Optional CD player, available premium audio systems. Limited integrated technology compared to modern vehicles. Driver Assistance Driver Assistance Features: Cruise Control, Optional Park Assist (rear ultrasonic sensors). Connectivity Connectivity Options: Not applicable in the modern sense; primarily basic audio system connections. 🔧 Maintenance Service Intervals Oil Change Interval: Typically 3,000-7,500 miles or 6 months, depending on oil type and driving conditions (refer to manual for exact specs) Transmission Fluid Change: Recommended every 30,000-50,000 miles for heavy-duty use (refer to manual for exact specs) Coolant Flush: Every 50,000-100,000 miles or 2-5 years, depending on coolant type (refer to manual) Fluid Specifications Engine Oil Specification: SAE 5W-30 or 10W-30 (API Certified) for gasoline engines; SAE 15W-40 (API CJ-4) for Duramax diesel. Consult manual for precise grade. Transmission Fluid Type: Dexron III/VI for automatic transmissions; Allison approved fluid for Allison...