🏷️ Basic Information Identification Make: GMC Model: Sierra HD 2500-3500 Pickup Truck Years Covered: 2007, 2008, 2009 👋 Introduction Market Position Vehicle Segment: Heavy-duty pickup truck, designed for towing, hauling, and demanding work applications Competitive Analysis Key Competitors: Ford Super Duty F-250/F-350, Ram 2500/3500 Heavy Duty Key Features Manual Advantage: Comprehensive, factory-level information for DIY repairs and professional service Value Proposition: Cost-effective alternative to dealership service, empowering owners with repair knowledge 📋 Manual Details Coverage Areas Manual Type: Service & Repair Workshop Manual Language: English Format: Downloadable PDF Digital Rights: Unlimited usage across multiple devices, printable 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, repair procedures, component testing for all gasoline and diesel engines Transmission: Covers automatic and manual transmissions, including overhaul, diagnostics, and fluid specifications Drivetrain: Front and rear axle systems, differential, transfer case, driveshafts, and CV joints Suspension: Front and rear suspension components, steering linkage, shock absorbers, springs, and alignment procedures Brakes: Hydraulic brake system, ABS, EBD, brake pad and rotor replacement, caliper service, and bleeding procedures Electrical: Complete wiring diagrams, fuse box locations, component testing, starter, alternator, battery, lighting, and accessory circuits HVAC: Heating, ventilation, and air conditioning system diagnosis, refrigerant handling, component replacement, and performance testing Body: Body panel removal and installation, door mechanisms, interior trim, glass, bumpers, and collision repair basics Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), OBD-II procedures, and diagnostic flowcharts Procedures Included Maintenance: Scheduled maintenance intervals, fluid changes (oil, coolant, transmission fluid, brake fluid), filter replacements, and inspections Repair: Step-by-step instructions for component replacement, rebuilds, and system repairs Troubleshooting: Diagnostic charts and procedures for identifying and resolving common and complex vehicle issues Specifications: Torque specifications for all fasteners, fluid capacities, and critical measurement data Wiring Diagrams: Comprehensive, clearly labeled electrical wiring diagrams for all vehicle systems Technical Depth Depth Level: Professional-level, covering basic maintenance to complex engine and transmission overhauls Illustrations: Hundreds of detailed photos and exploded diagrams for visual guidance 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text within the PDF for quick information retrieval Print Quality Printability: Full manual printing capability Binding Type Binding Method: Digital Download (PDF format) Paper Type Paper Quality: Not Applicable (Digital) ⚙️ Engine Specifications Primary Engine Options Engine Code 1: Vortec 6.0L V8 (L76/L96) Displacement 1: 6.0 Liters (364 cu. in.) Horsepower 1: Approximately 350-360 hp (varies slightly by model year and configuration) Torque 1: Approximately 370-380 lb-ft (varies slightly by model year and configuration) Engine Code 2: Duramax 6.6L V8 Turbo-Diesel (LLY/LBZ/LMM) Displacement 2: 6.6 Liters (403 cu. in.) Horsepower 2: Approximately 300-365 hp (varies by specific engine variant LLY/LBZ/LMM) Torque 2: Approximately 520-765 lb-ft (varies by specific engine variant LLY/LBZ/LMM) Performance Fuel Delivery Gas: Multi-port Fuel Injection (MPI) Fuel Delivery Diesel: Common Rail Direct Injection (CRDI) with Turbocharger and Intercooler Emission Controls: Catalytic converter (gas), Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR) (diesel) 🔧 Transmission Standard Transmission Transmission Type 1: 6-Speed Automatic (AlliSON 1000/2000 series for diesel) Optional Transmission Transmission Type 2: 6-Speed Manual (for specific configurations, primarily 2500 models) Features Towing Mode: Integrated tow/haul mode for optimized shifting during towing Transfer Case: Electronic Shift Transfer Case (2WD/4WD Auto/4WD Low) on most models 📐 Dimensions Exterior Wheelbase Options: Multiple wheelbase options (e.g., ~143.5" for 8' bed, ~167.5" for 6.5' bed Crew Cab) Bed Length Options: Standard Box (6.5 ft), Long Box (8 ft) Weights Gcwr Diesel: Up to 23,000 lbs (Gross Combined Weight Rating for diesel models) Payload Capacity: Varies significantly by configuration, but generally robust for HD trucks Towing Capacity: Up to ~12,000-16,000 lbs (conventional hitch) and higher with gooseneck/5th wheel, depending on configuration 🛡️ Safety Features Ratings NHTSA Ratings: Generally good for its class, but specific ratings for these model years should be verified via NHTSA Active Features Traction Control: StabiliTrak Electronic Stability Control system ABS: Anti-lock Braking System (ABS) Passive Features Airbags: Front airbags for driver and passenger, available side curtain airbags 💡 Technology Features Infotainment Audio Options: Factory AM/FM stereo with CD player, optional premium audio systems, and auxiliary input jacks. Navigation: Optional factory navigation system available on higher trim levels. Driver Assistance Parking Assist: Available rear parking assist sensors on some models. Connectivity Towing Features: Integrated trailer brake controller (optional or standard on higher trims), trailer sway control. 🔧 Maintenance Service Intervals Oil Change Interval Gas: Typically every 3,000-5,000 miles or 3-6 months for gasoline engines, depending on usage. Oil Change Interval Diesel: Typically every 5,000-7,500 miles or 6 months for Duramax diesel, with more frequent changes recommended under severe use. Transmission Fluid Interval: Check manual for specific intervals, often around 45,000-100,000 miles depending on load and usage. Coolant Interval: Initial change often at 100,000 miles, then every 50,000 miles thereafter for Dex-Cool coolant. Fluid Specifications Engine Oil Gas: SAE 5W-30 Synthetic (API SM or higher), confirm with manual for specific viscosity...