🏷️ Basic Information Identification Make: Chevrolet Model: Silverado 2500 HD Year: 2004 Codes Platform: GMT800 (C/K Platform) 👋 Introduction Market Position Segment: Heavy-duty pickup truck, positioned for commercial, towing, and heavy hauling applications. Competitive Analysis Competitors: Ford F-250 Super Duty, Dodge Ram 2500 HD. Key Features Durability: Renowned for robust construction, heavy-duty frames, and powerful drivetrain options. Towing Capacity: Class-leading towing and payload capabilities. Engine Options: Available with potent V8 gasoline engines and a highly regarded Duramax turbodiesel engine. 📋 Manual Details Coverage Areas Overall Coverage: Comprehensive service and repair coverage for the 2004 Chevrolet Silverado 2500 HD. Page Count Estimated Page Count: Thousands (as it's a comprehensive service manual). Manual Type Type: Service and Repair Manual Software Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, repair, and overhaul procedures for all gasoline and diesel engines offered in the 2500 HD. Transmission: Coverage for automatic (e.g., 4L80-E, Allison 1000) and manual transmissions, including removal, installation, overhaul, and troubleshooting. Drivetrain: Front and rear axle service, differential repair, propeller shaft and CV joint maintenance, four-wheel drive system operation and repair. Suspension: Front and rear suspension components, steering system, alignment specifications, component replacement. Brakes: Front and rear brake system service (disc/drum configurations), ABS system diagnostics and repair, brake fluid specifications. Electrical: Complete wiring diagrams, fuse/relay identification, lighting systems, power accessories, instrument cluster diagnostics, ignition system repair. HVAC: Climate control system diagnosis and repair, refrigerant handling, component replacement (compressor, evaporator, condenser). Body And Frame: Body panel repair, interior trim removal/installation, door and window mechanisms, frame straightening procedures (if applicable). Fuel System: Fuel tank service, fuel pump replacement, fuel filter replacement, fuel injection system diagnostics. Exhaust System: Exhaust manifold repair, catalytic converter replacement, muffler and pipe service. Cooling System: Radiator service, water pump replacement, thermostat replacement, coolant specifications. Procedures Included Preventative Maintenance: Oil changes, filter replacements, fluid checks, tire rotations, spark plug replacement. Troubleshooting: Diagnostic flowcharts and symptom-based troubleshooting guides for various vehicle issues. Repair And Rebuild: Step-by-step instructions for component removal, installation, repair, and complete overhauls. Diagnostics: Engine control module (ECM) diagnostics, sensor testing, actuator testing, OBD-II diagnostic procedures. Torque Specifications: Comprehensive list of torque values for critical fasteners across all vehicle systems. Technical Depth Depth: Expert-level technical detail suitable for professional mechanics and advanced DIY enthusiasts. Wiring Diagrams: Detailed, system-specific electrical wiring diagrams with component locations. Diagnostic Codes: Coverage of common Diagnostic Trouble Codes (DTCs) and their troubleshooting procedures. 📊 Manual Specifications File Format Format: PDF (Portable Document Format). Searchability: Typically searchable text for quick access to specific information. Print Quality Quality: High-resolution, printable pages for clear diagrams and text. Binding Type Binding: N/A (Digital Download). Paper Type Paper Type: N/A (Digital Download). ⚙️ Engine Specifications Primary Engine Engine 1 Code: Vortec 6.0L V8 (LQ4/LQ7) Engine 1 Displacement: 5967 cc (364 ci) Engine 1 Horsepower: 300-325 hp @ 4400-5200 rpm (depending on variant) Engine 1 Torque: 370-375 lb-ft @ 3200-4000 rpm (depending on variant) Diesel Engine Engine 2 Code: Duramax 6.6L V8 Turbo Diesel (LB7) Engine 2 Displacement: 6599 cc (403 ci) Engine 2 Horsepower: 300 hp @ 3100 rpm Engine 2 Torque: 520 lb-ft @ 1600 rpm Performance Compression Ratio 6 0L: 9.4:1 Compression Ratio 6 6L Diesel: 18.0:1 Fuel System Gasoline Injection: Multi-point Fuel Injection (MPFI) Diesel Injection: Direct Injection, electronically controlled common rail 🔧 Transmission Standard Transmission Type Gasoline: 4-speed automatic (4L80-E) Optional Transmission Type Diesel: 5-speed Allison 1000 automatic Manual Transmission Availability: Rarely specified for HD models in this year, primarily automatic. Features Towing Mode: Tow/Haul mode for optimized transmission shift points when towing. Drivetrain Options: Available in 2WD (RWD) and 4WD configurations. 📐 Dimensions Exterior Wheelbase Std Cab: 133.0 inches (3378 mm) Wheelbase Ext Cab: 143.5 inches (3645 mm) Bed Length Options: 6.5 ft (short bed), 8 ft (long bed) Weights Gvwr Range: 8,600 lbs to 10,000+ lbs (depending on configuration) Curb Weight Range: Approx. 5,500 - 6,500 lbs Cargo Payload Capacity: Up to 4,000+ lbs (depending on configuration) Max Towing Capacity: Up to 12,000+ lbs (depending on configuration, typically with proper hitch and trailering package) 🛡️ Safety Features Ratings NHTSA Frontal Crash Driver: Not rated or 4-star depending on specific configuration and test year. NHTSA Frontal Crash Passenger: Not rated or 4-star depending on specific configuration and test year. Active Features ABS: Standard Anti-lock Braking System (ABS) on all wheels. Passive Features Airbags: Driver and front passenger airbags. Seatbelts: Height-adjustable shoulder belts with pretensioners, three-point rear seatbelts. 💡 Technology Features Infotainment Audio System: Factory AM/FM/CD player, optional Bose premium audio system. Navigation: Optional dealer-installed or aftermarket navigation systems. Driver Assistance Cruise Control: Standard cruise control. Connectivity Onstar: Optional OnStar telematics system. 🔧 Maintenance Service Intervals Oil Change Gasoline: Every 3,000-7,500 miles or 6 months (refer to manual for specific conditions). Oil Change Diesel: Every 5,000-10,000 miles or 6-12 months (refer...