🏷️ Basic Information Identification Make: GMC Model: C2500 Year: 1990 Generation Generation Code: GMT400 Codes Platform: GMT400 👋 Introduction Market Position Target Audience: DIYers, independent repair shops, fleet maintenance Competitive Analysis Advantage Over Printed Manuals: Instant access, convenience, searchability, potentially lower cost than OE printed manuals Key Features Licensing: Officially licensed, derived from OE materials Access Duration: One year of access with discounts for renewal Software Provider: RepairSurge 📋 Manual Details Coverage Areas Coverage Type: Comprehensive Service and Repair Specific Models Covered: 1990 GMC C2500 Pickup Truck Page Count Page Count Estimate: Extensive (Specific count not provided, but typical for OE service manuals) Manual Type Manual Type: Digital Service and Repair Manual Software Language Language: English Format Format: Online Software/Web-based Access 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical, lubrication, cooling, fuel, ignition, exhaust, emissions control, engine diagnostics Drivetrain Systems: Manual transmission, automatic transmission, transfer case (if applicable), drive axles, propeller shafts, differentials Suspension Steering: Front suspension, rear suspension, steering gear, power steering system, wheel alignment Braking Systems: Front brakes (disc), rear brakes (drum or disc), parking brake, hydraulic system, anti-lock braking system (if equipped) Electrical Systems: Battery, charging system, starting system, ignition system, lighting, instruments and indicators, body electrical, powertrain control module (PCM) wiring diagrams HVAC Systems: Heating, ventilation, and air conditioning (HVAC) system diagnosis and repair Body Chassis: Body construction, doors, windows, interior trim, exterior trim, bumpers, frame, chassis components Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks and changes, lubrication, tire rotation, spark plug replacement Diagnostic Procedures: Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based diagnostics Repair Procedures: Step-by-step repair instructions for all major systems Overhaul Rebuild: Engine overhaul, transmission overhaul, differential overhaul procedures Technical Depth Depth Of Information: Factory-level detail suitable for professional technicians and advanced DIY enthusiasts Troubleshooting Capability: Detailed troubleshooting charts, diagnostic flowcharts, component testing procedures 📊 Manual Specifications File Format Access Method: Web browser access via internet connection Device Compatibility: PC, laptop, smartphone, tablet Print Quality Printability: Likely printable, though not a physical print product Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Options: 4.3L (262 ci) V6, 5.0L (305 ci) V8, 5.7L (350 ci) V8 (Throttle Body Injection or Multi-Port Fuel Injection depending on specific variant) 4.3L V6 Spec: Code: L35, 90° OHV, Sequential Fuel Injection (TBI or CPI/CSFI) 5.7L V8 Spec: Code: L05, 90° OHV, Throttle Body Injection (TBI) or Central Sequential Fuel Injection (CSFI/CPI) Performance Horsepower Range: Approximately 160-200 HP (depending on specific engine and configuration) Torque Range: Approximately 230-300 lb-ft (depending on specific engine and configuration) Fuel System Fuel Delivery: Throttle Body Injection (TBI) or Central Sequential Fuel Injection (CSFI/CPI) across various engine options 🔧 Transmission Standard Standard Transmission: 4-speed Manual (NP435 or Getrag 360) or 4-speed Automatic (700R4/4L60) Optional Optional Transmission: 4-speed Automatic (700R4/4L60) for V8 engines, potentially 4L80E for heavy-duty applications or later in the year. Features Transmission Fluid Spec: Dexron-III (or equivalent) for automatic transmissions 📐 Dimensions Exterior Body Styles: Regular Cab, Extended Cab Wheelbase Options: 117.7 inches (Regular Cab), 131.5 inches (Extended Cab), 164.5 inches (Long Bed) Weights Curb Weight Range: Approx. 4,000 - 5,500 lbs (depending on configuration) Gvw Range: Up to 7,200 lbs (GVWR for C2500) 🛡️ Safety Features Ratings Safety Ratings Era: 1990s safety standards; specific NHTSA/IIHS ratings for this exact configuration are likely unavailable or dated. Active Features Active Safety Features: Anti-lock Braking System (ABS) - often optional on rear wheels or 4-wheel ABS on certain trims/engines Passive Features Passive Safety Features: Lap and shoulder belts, padded dashboard, side door guard beams 💡 Technology Features Infotainment Infotainment System Era: Basic audio systems, typically AM/FM radio with cassette player or CD player on higher trims. No complex infotainment or touchscreens. Driver Assistance Driver Assistance Features: Limited to ABS (optional). No advanced driver-assistance systems (ADAS) like adaptive cruise control or lane keeping assist. Connectivity Connectivity Features: N/A (No integrated Bluetooth, Wi-Fi, or smartphone integration) 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000-7,500 miles or 6-12 months, depending on oil type and driving conditions. Transmission Fluid Service: Recommended every 30,000-60,000 miles for automatic transmissions, often with filter change. Coolant Flush Interval: Typically every 30,000-50,000 miles or 2-3 years. Fluid Specifications Engine Oil Spec: API Service SG, SF, or CD rated oil, viscosity typically 10W-30 or 10W-40 (check owner's manual for exact spec) Coolant Spec: Ethylene glycol based coolant (green), 50/50 mix with distilled water. Brake Fluid Spec: DOT 3 Brake Fluid Known Issues Common Engine Issues: TBI injector pulse issues, intake manifold gasket leaks (particularly on 4.3L V6), distributor gear wear, exhaust manifold cracks. Common Transmission Issues: 700R4/4L60 wear in 3-4 clutch pack, torque converter shudder. Common Chassis Issues: Ball joint wear, U-joint wear, rear spring sag, body rust (especially in salt-belt regions). Common Electrical Issues: Alternator failure,...