🏷️ Basic Information Identification Make: GMC Model: K3500 Year: 1991 Codes Chassis Code: GMT400 👋 Introduction Market Position Target Audience: DIY mechanics, independent repair shops, fleet maintenance. Competitive Analysis Comparison To Printed Manuals: Offers superior convenience, searchability, and up-to-date information compared to older printed manuals. Key Features Licensing: Officially licensed, derived from OE (Original Equipment) materials. Convenience: Instant online access, no shipping delays, usable on multiple devices. Value Proposition Cost Savings: Enables significant savings by empowering users to perform their own repairs and maintenance. 📋 Manual Details Coverage Areas Manual Type: Service and Repair Manual Format: Online Software/Digital Access Language: English Access Duration: 1 Year Platform Compatibility: PC, Laptop, Smartphone, Tablet (Web Browser) 📖 Manual Coverage Systems Covered Engine Systems: Engine overhaul, diagnostics, fuel injection, cooling, lubrication, exhaust, emissions controls. Transmission Systems: Manual and automatic transmission repair, diagnostics, fluid specifications, and internal component service. Drivetrain Systems: Front axle, rear axle, driveshafts, universal joints, differentials, and four-wheel-drive system service. Suspension Steering Systems: Front and rear suspension components (leaf springs, shocks, control arms), steering gear, power steering system, alignment specifications. Brake Systems: Front and rear disc/drum brake service, hydraulic system diagnostics, parking brake adjustment, ABS (if equipped) troubleshooting. Electrical Systems: Wiring diagrams, component testing, charging system, starting system, lighting, instrument cluster, body electricals, fuses and relays. HVAC Systems: Air conditioning system diagnosis and repair, heating system service, climate control components. Body And Chassis: Body panel repair, door mechanisms, glass replacement, chassis lubrication, frame inspection. Procedures Included Maintenance Procedures: Routine maintenance tasks such as oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections/replacements. Diagnostic Procedures: Troubleshooting guides, symptom-based diagnostics, fault code interpretation (where applicable), electrical system testing methodologies. Repair Procedures: Step-by-step instructions for component removal, replacement, and reassembly of all major vehicle systems. Rebuild Procedures: Detailed instructions for engine, transmission, and differential rebuilds, including torque specifications and clearances. Installation Procedures: Guidelines for installing aftermarket parts or replacing major components. Technical Depth Depth Of Coverage: Comprehensive factory-derived information covering routine maintenance to complete engine and transmission overhauls. Diagnostic Capabilities: Includes detailed diagnostic charts, symptom analysis, and component testing procedures. Technical Specifications Detail: Extensive listing of torque specifications, clearances, fluid capacities, electrical resistance values, and more. 📊 Manual Specifications File Format File Format: Proprietary Digital Format (Accessible via Web Browser) Print Quality Print Quality: N/A (Digital Access) Binding Type Binding Type: N/A (Digital Access) Paper Type Paper Type: N/A (Digital Access) ⚙️ Engine Specifications Primary Engine Engine Options: 4.3L V6 (VIN Z), 5.7L V8 (VIN R), 7.4L V8 (VIN L). Performance Horsepower 4.3L V6: Approx. 160 hp @ 4000 rpm (variation by specific model and year). Torque 4.3L V6: Approx. 230 lb-ft @ 2000 rpm (variation by specific model and year). Horsepower 5.7L V8: Approx. 210 hp @ 4000 rpm (variation by specific model and year). Torque 5.7L V8: Approx. 300 lb-ft @ 2400 rpm (variation by specific model and year). Horsepower 7.4L V8: Approx. 230 hp @ 3600 rpm (variation by specific model and year). Torque 7.4L V8: Approx. 380 lb-ft @ 2000 rpm (variation by specific model and year). Fuel System Fuel Injection Type: Throttle Body Injection (TBI) for 4.3L and 5.7L; Sequential Fuel Injection (SFI) may be available on some later models or specific configurations. Fuel Type: Unleaded Gasoline Engine Construction Block Material: Cast Iron Cylinder Head Material: Cast Iron 🔧 Transmission Standard Standard Transmission Options: 5-speed manual transmission (NV4500 or earlier Muncie/New Process variants). Optional Optional Transmission Options: 4-speed automatic transmission (TH400 or 4L80-E, depending on configuration and engine). Features Four Wheel Drive System: Part-time 4WD system with manual or electronic transfer case engagement. 📐 Dimensions Exterior Body Styles: Regular Cab, Extended Cab. Wheelbase Options: 131.5 inches (Regular Cab), 153.1 inches (Extended Cab). Weights Gross Vehicle Weight Rating Gvwr: Ranges from 8,600 lbs to 10,500 lbs depending on configuration and axle ratios. Curb Weight: Varies significantly based on configuration (engine, cab, drivetrain) but typically ranges from 4,500 lbs to 5,500 lbs. 🛡️ Safety Features Ratings Crash Test Information: Information regarding crashworthiness may be limited for this era of vehicle, focus is on repair and maintenance. Active Features Braking System: Power-assisted front disc brakes, rear drum brakes. Anti-lock Braking System (ABS) available on rear wheels only on some models. Passive Features Seat Belts: Lap and shoulder belts for front occupants, lap belts for rear occupants. 💡 Technology Features Infotainment Audio System: Factory AM/FM radio, optional cassette player, or CD player. Basic speaker system. Driver Assistance ABS: Rear-wheel ABS was optional on some models, providing enhanced braking stability. Connectivity Connectivity Features: No integrated Bluetooth or modern connectivity features. Relies on aftermarket solutions. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000 to 5,000 miles or 6 months, depending on driving conditions and oil type used. Refer to manual for precise recommendations. Transmission Fluid Change Interval: Automatic transmissions: typically...