🏷️ Basic Information Identification Make: GMC Model: Sierra HD 2500 / 3500 Pickup Truck Model Year Range: 2007-2009 Codes Platform Code: GMT900 (HD variants) 👋 Introduction Market Position Market Segment: Heavy Duty Pickup Truck segment, aimed at commercial use, towing, and heavy payload applications Branding: GMC positions the Sierra HD line as 'Professional Grade', emphasizing durability, capability, and suitability for demanding work environments. Competitive Analysis Competitors: Ford F-Series Super Duty (F-250, F-350), Ram Heavy Duty (2500, 3500) Key Features Target Audience: Do-it-yourselfers, independent repair shops, fleet maintenance personnel Manual Benefit: Cost-effective way to maintain and repair the vehicle, ensuring longevity and optimal performance Content Quality: Easy-to-read text, high-quality diagrams, step-by-step instructions, exploded views 📋 Manual Details Coverage Areas Model Coverage: All GMC Sierra HD 2500 and 3500 Pickup Truck models Engine Coverage: All engines offered for the 2007-2009 Sierra HD models Transmission Coverage: All transmission types offered for the 2007-2009 Sierra HD models Trim Level Coverage: All trim levels Page Count Estimated Page Count: Extensive (typically 2500+ pages for full factory service manuals) Manual Type Type: Factory Service Repair Manual / Workshop Manual Additional Manual Types: Contains diagnostic procedures, specifications, component locations, and torque values. Language Language: English Format Format: PDF File Format Searchability: Likely searchable text within the PDF, enhancing ease of finding specific information. 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, fuel system, ignition system, cooling system, exhaust system, emissions control, lubrication system Transmission Drivetrain: Automatic and manual transmissions, transfer case, driveshafts, axles, differentials Chassis: Suspension (front and rear), steering system, braking system (including ABS and stability control), wheels and tires Electrical Electronics: Engine control module (ECM), body control module (BCM), instrument cluster, lighting, infotainment system, power accessories, charging system, starting system, wiring diagrams Body Interior: Body construction, exterior panels, doors, glass, interior trim, seats, HVAC system, airbags Tire And Wheel: Tire specifications, wheel torque, balancing, alignment procedures Body And Frame: Frame inspection and repair, body panel replacement, collision repair data. Procedures Included Maintenance: Routine maintenance, fluid checks and changes, filter replacements, lubrication Repair Rebuild: Engine overhaul, transmission disassembly and reassembly, brake component replacement, suspension component repair, electrical component diagnosis and repair Troubleshooting: Diagnostic procedures for various symptoms, electrical system diagnosis using wiring diagrams, engine performance issues, transmission malfunctions Diagnostics: On-board diagnostic (OBD-II) system information, diagnostic trouble codes (DTCs), testing procedures for sensors and actuators Emission Control Systems: Diagnosis and repair of catalytic converters, oxygen sensors, and other emissions components. Calibration: Procedures for recalibrating sensors and modules after component replacement (e.g., steering angle sensor, ABS sensors). Technical Depth Depth: Comprehensive (covers everything from basic maintenance to complete vehicle disassembly and reassembly) Wiring Diagrams: Detailed electrical schematics and wiring diagrams for all vehicle systems. 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Printable without restriction Binding Type Binding Format: Digital (Downloadable PDF) Paper Type Digital Media: PDF Reader required (Adobe Acrobat Reader recommended for optimal display of images/graphics) ⚙️ Engine Specifications Primary Engine Engine Options: 6.0L Power Stroke V8 Turbo Diesel, 6.6L Duramax V8 Turbo Diesel (LBZ/LMM variants), 6.0L Vortec V8 Gasoline, 8.1L Vortec V8 Gasoline Performance Horsepower Range: Varies by engine, typically 300-360 hp for diesel, 323-366 hp for gasoline Torque Range: Varies by engine, typically 520-650 lb-ft for diesel, 373-505 lb-ft for gasoline Fuel System Diesel Fuel System: Common Rail Direct Injection (for Power Stroke and Duramax) Gasoline Fuel System: Multi-port Fuel Injection (MPFI) Cooling System Cooling Capacity: Refer to manual for specific engine capacities (typically 20-25 quarts for diesel) Lubrication System Oil Capacity: Refer to manual for specific engine capacities (e.g., 15 quarts for 6.6L Duramax, 12 quarts for 6.0L Vortec) Oil Specification: Refer to manual for specific engine oil viscosity and API service classification (e.g., API CJ-4 or CK-4 for diesel, API SN for gasoline) Engine Codes Gasoline Engine Codes: Vortec 6.0L (L76, L96), Vortec 8.1L (L18) Diesel Engine Codes: 6.0L Power Stroke (V8), 6.6L Duramax (LLY, LBZ, LMM) 🔧 Transmission Standard Standard Transmission: Depending on configuration, may include Allison 1000/2000 series 5/6-speed automatic or manual transmissions for gasoline variants. Optional Optional Transmission: Allison 1000 (5-speed automatic, 2007-2008), Allison 2000 (6-speed automatic, 2009 diesel), possibly manual transmissions for gasoline models. Features Diesel Transmission Features: Heavy-duty construction, tow/haul mode, advanced electronic controls Fluid Specifications Automatic Transmission Fluid: Dexron-VI (for most GM transmissions of this era) Manual Transmission Fluid: Refer to manual for specific viscosity and type (e.g., synthetic manual transmission fluid) 📐 Dimensions Exterior Wheelbase Options: Multiple wheelbase options available (e.g., 133.5", 143.5", 153.5", 167.5" for 2500HD, longer for 3500HD) Overall Length: Varies significantly with cab and bed configuration Body Styles: Regular Cab, Extended Cab (Crew Cab), Long Bed, Short Bed Cargo Bed Length Options: Approx. 6.5 ft (short bed) and 8 ft (long bed) Weights Gvwr: Exceeds 8,500 lbs (specific to payload package and configuration) Curb Weight: Varies significantly by configuration,...