🏷️ Basic Information Identification Make: GMC Model: C2500 Year: 1991 Market Segment: Full-Size Pickup Truck Generation: Third Generation (GMT400) 👋 Introduction Market Position Target Audience: DIY Mechanics, Independent Repair Shops, GMC C2500 Owners Value Proposition: Cost-effective alternative to printed manuals and dealership service; instant online access Competitive Analysis Competitor Manuals: Haynes, Chilton (traditional print formats); other online service platforms Key Features Convenience: Instant online access from multiple devices, no physical storage needed Accuracy: Licensed OE information ensures high accuracy for repairs and diagnostics Comprehensiveness: Covers a vast range of systems and procedures, enabling nearly all repairs 📋 Manual Details Coverage Manual Type: Service and Repair Manual Software Language: English Format: Online Software (Web Browser Accessible) Access Period: 1 Year (with option for renewal) Developer: RepairSurge Licensing: Officially Licensed, OE Material Derived 📖 Manual Coverage Systems Engine Overhaul: Complete Engine Service and Rebuild Procedures Fuel System: Fuel injection, fuel pump, fuel filter, fuel lines, evaporative emissions control Cooling System: Radiator, water pump, thermostat, coolant, hoses, fan Ignition System: Distributor, spark plugs, ignition coil, timing Exhaust System: Exhaust manifolds, catalytic converter, muffler, pipes Transmission Service: Manual and Automatic Transmission Repair, Fluid Specifications, Torque Converter Drivetrain: Driveshaft, universal joints, rear axle, differential, axles Suspension Service: Front and Rear Suspension Components, Shocks, Struts, Springs, Bushings Steering System: Power steering, steering gear, tie rods, steering column Brake System: Front and Rear Brakes (Disc/Drum), Master Cylinder, Brake Lines, ABS (if equipped) Electrical System: Battery, charging system, starter, lighting, accessories Wiring Diagrams: Comprehensive Wiring Diagrams for all Electrical Systems HVAC System: Heating, Ventilation, and Air Conditioning (HVAC) Controls, Compressor, Refrigerant Body And Frame: Body Panels, Doors, Hood, Tailgate, Chassis Components Procedures Diagnostic Procedures: Troubleshooting Guides and Diagnostic Steps for Various Systems Maintenance Schedules: Recommended Service Intervals for Routine Maintenance Repair Procedures: Step-by-Step Repair Instructions for all Major Components Component Replacement: Detailed Instructions for Replacing Wear Items and Failed Components Tune Up Procedures: Ignition timing, spark plugs, filters, fluids Torque Specifications: Critical Torque Values for Engine, Chassis, and Drivetrain Components Technical Depth Depth Level: Comprehensive; Covers Basic Maintenance to Complete Overhaul and Diagnostics 📊 Manual Specifications Format File Format Characteristics: Web-based, accessible via standard web browsers on PC, laptop, smartphone, tablet Searchability: Likely text-searchable within the software interface Print Quality Print Capability: While digital, the information can typically be printed from a web browser if desired Binding Type Binding: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Options: 4.3L V6 (VIN Z), 5.0L V8 (VIN H), 5.7L V8 (VIN K), 7.4L V8 (VIN G) Performance 4.3L V6 (Vin Z): Approx. 160 hp @ 4000 rpm, 230 lb-ft @ 2400 rpm 5.7L V8 (Vin K): Approx. 210 hp @ 4000 rpm, 300 lb-ft @ 2400 rpm 7.4L V8 (Vin G): Approx. 230 hp @ 3600 rpm, 380 lb-ft @ 2400 rpm Fuel System Fuel Delivery: Throttle Body Injection (TBI) for most engines, potentially multi-port for later models within the generation (check specific VIN) Fuel Type: Unleaded Gasoline 🔧 Transmission Standard Standard Transmission: 4-speed Manual (NP435/NV4500) Optional Optional Transmission: 4-speed Automatic (700R4/4L60/4L80E) Features Transmission Fluid Type: Dexron-III (or equivalent for automatic transmissions) 📐 Dimensions Exterior Wheelbase Options: 132.8 inches (Standard Bed), 155.3 inches (Long Bed) Body Styles: Regular Cab (Fleetside) Weights Curb Weight Range: Approximately 4,000 - 5,000 lbs depending on configuration Gvw Range: 2500 Series GVWR typically 6,400 lbs to 7,200 lbs 🛡️ Safety Features Ratings Crash Testing Era: Pre-NHTSA 5-star rating system prominence; focus on structural integrity Active Features ABS: Available Anti-lock Braking System (ABS) for rear wheels Passive Features Seat Belts: Lap and shoulder belts (standard), potentially rear shoulder belts for extended cabs (if offered) 💡 Technology Features Infotainment Audio System: AM/FM stereo with cassette player, optional CD player, manual or power antenna Driver Assistance Cruise Control: Optional electronic cruise control Connectivity Gauges: Analog gauges including speedometer, tachometer (optional), fuel, oil pressure, temperature, voltmeter 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 miles or 3 months (typical for this era, consult manual for specific engine) Engine Coolant Interval: Flush and replace every 2 years or 30,000 miles (typical) Transmission Fluid Interval: Check periodically, replace fluid and filter every 30,000 - 60,000 miles (consult manual) Fluid Specifications Engine Oil Viscosity: API Service SG or SH. Viscosity: 10W-30 (common for V8s), 5W-30 or 10W-30 for V6 (check manual) Coolant Type: Ethylene Glycol (Green) based coolant, 50/50 mix with distilled water Known Issues Common Wear Items: Ball joints, tie rod ends, leaf spring bushings, catalytic converter, fuel injectors (TBI), distributor gear wear Electrical Gremlins: As with many vehicles of this era, electrical connections and grounds can be prone to corrosion leading to intermittent issues. Rust: Areas prone to rust include cab corners, rocker panels, and bed rails, especially in regions with salted roads. 📚 Vehicle History Brand Heritage Gmc Legacy: GMC...