🏷️ Basic Information Identification Make: GMC Model: K2500 Year: 1990 Generation Generation: Third Generation (GMT400) Codes Chassis Code: GMT400 👋 Introduction Market Position Market Position: Essential diagnostic and repair resource for 1990 GMC K2500 owners and independent repair facilities. Competitive Analysis Competitive Analysis: Superior to outdated printed manuals due to searchability, accessibility, and interactive features. Licensed OE data ensures accuracy and completeness, surpassing generic repair guides. Key Features Key Features: Licensed OE information, year-round access, PC/tablet/smartphone compatibility, detailed procedures, diagnostic flowcharts. 📋 Manual Details Coverage Areas Coverage Areas: Full Service and Repair Page Count Page Count Estimated: Extensive (Digital Format) Manual Type Manual Type: Service and Repair Manual Software Language Language: English Format Format: Online Software/Web-based Access 📖 Manual Coverage Systems Covered Engine Mechanical: Yes Engine Electrical: Yes Fuel System: Yes Cooling System: Yes Exhaust System: Yes Transmission Manual: Yes Transmission Automatic: Yes Drivetrain Components: Yes (Front Axle, Rear Axle, Driveshafts) Suspension Front: Yes Suspension Rear: Yes Steering System: Yes Brake System: Yes Electrical System Body: Yes Lighting System: Yes HVAC System: Yes Body Panels: Yes Interior Trim: Yes Chassis And Frame: Yes Body And Interior: Yes (including doors, windows, seats, headliner) Procedures Included Routine Maintenance: Yes (Oil changes, filter replacements, tune-ups) Diagnostics Troubleshooting: Yes (Fault code interpretation, symptom analysis) Component Removal Installation: Yes (Engine, transmission, suspension, brakes, etc.) Rebuilding Overhauling: Yes (Engine, transmission, differentials) Wiring Diagrams: Yes Torque Specifications: Yes Special Tools Procedures: Yes Diagnostics Electrical: Yes (including wiring diagrams for all major systems) Troubleshooting Guides: Yes (step-by-step guides for common and uncommon problems) Technical Depth Technical Depth: Comprehensive (Factory-level detail) Rebuild Specifications: Yes (engine, transmission, differential rebuild specifications and procedures) Diagnostic Codes: Yes (OBD-I diagnostic trouble codes and their meanings) 📊 Manual Specifications File Format File Format: Proprietary Software (Web-based Access) Print Quality Print Quality: N/A (Digital Format) Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Code: L05 (5.7L V8) Engine Type: Vortec V8, Overhead Valve, Throttle Body Injection Performance Horsepower: Approximately 190 hp @ 4000 rpm (Varies slightly by specific configuration) Torque: Approximately 300 lb-ft @ 2000 rpm (Varies slightly by specific configuration) Fuel System Fuel Delivery: Throttle Body Injection (TBI) Recommended Fuel: 87 Octane Unleaded Gasoline Fluid Capacity Engine Oil Capacity: 5 Quarts (4.7 Liters) with filter change (5.7L) Fluid Specifications Engine Oil Specification: API SF or SG, SAE 10W-30 (Consult manual for seasonal variations) Timing Timing Belt Chain: Timing Chain Emission Controls Emission Controls: Catalytic Converter, EGR System, PCV System 🔧 Transmission Standard Transmission Type Standard: 4L60 4-Speed Automatic (RWD/4WD) Optional Transmission Type Optional: NV4500 5-Speed Manual (Available on some configurations) Features Transmission Fluid Type: Dexron-III (for 4L60) Transmission Fluid Capacity: Approximately 9.5 Pints (4.5 Liters) for 4L60 (dry fill) Transfer Case: NP241 (part-time, chain-driven) 📐 Dimensions Exterior Body Styles: Regular Cab, Extended Cab, Crew Cab Bed Lengths: 6.5 ft (Fleetside), 8 ft (Fleetside) Weights Curb Weight: Approx. 4,500 - 5,500 lbs (Varies significantly by configuration) Gross Vehicle Weight Rating: Up to 8,600 lbs (GVWR) Towing Capacity: Up to 7,000-10,000+ lbs (Varies by axle ratio, engine, and configuration) Payload Capacity: Approx. 1,500 - 3,000+ lbs 🛡️ Safety Features Ratings NHTSA Crash Test Ratings: Not rated under modern NHTSA standards for this era. Active Features Active Safety Features: Anti-lock Braking System (ABS) on rear wheels (standard on K2500, optional 4-wheel ABS may have been available). Passive Features Passive Safety Features: Seat belts, reinforced cab structure. 💡 Technology Features Infotainment Infotainment System: AM/FM Radio, Cassette Player (Optional CD Player available on some trims). Driver Assistance Driver Assistance Features: Limited to ABS on rear wheels. Connectivity Connectivity Options: None (This era predates widespread vehicle connectivity). 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 miles or 6 months (Severe duty may require more frequent changes). Air Filter Replacement: Every 15,000 miles or annually. Spark Plug Replacement: Every 30,000-60,000 miles (depending on plug type). Transmission Fluid Change: Every 30,000-50,000 miles or annually (depending on usage). Fluid Specifications Coolant Type: GM P/N 10528789 (Green) or equivalent E.T.C. (Ethylene Glycol based) Brake Fluid Type: DOT 3 Power Steering Fluid Type: GM P/N 1050017 or Dexron-III ATF Known Issues Known Issues: TBI injector issues, potential coolant leaks from intake manifold gaskets, rear axle seal leaks, U-joint wear, catalytic converter failure, dashboard crack issues. 📚 Vehicle History Brand Heritage Brand Heritage: GMC (General Motors Truck Company) has a long history of producing robust and capable trucks for commercial and personal use. Model Evolution Model Evolution: The K2500 is part of GMC's C/K truck line, with the 1990 model year marking the introduction of the GMT400 platform, a significant redesign featuring improved aerodynamics, interior comfort, and chassis engineering. Production Production Location: Fort Wayne, Indiana; Janesville, Wisconsin; Pontiac, Michigan (USA)