🏷️ Basic Information

Make:

GMC

Model:

K3500

Year:

1990

Chassis Code:

GMT400

👋 Introduction

Positioning:

A comprehensive digital service and repair manual for owners and enthusiasts of the 1990 GMC K3500, offering a convenient and cost-effective alternative to traditional printed manuals or costly professional repairs.

Comparison:

Outperforms outdated printed manuals in terms of accessibility, searchability, and cost-effectiveness. Provides licensed OE material, ensuring accuracy and completeness not always found in generic third-party manuals.

Convenience:

Instant online access, compatible with multiple devices, year-long access with renewal options.

Content Quality:

Officially licensed, factory-derived information for high accuracy and reliability.

📋 Manual Details

Primary Coverage:

Factory-derived service and repair information

Estimated Pages:

Extensive (Digital format provides access to all content)

Type:

Service and Repair Manual Software

Language:

English

Format:

Online Software / Digital Access

📖 Manual Coverage

Powertrain:

Engine (V8, V6, Diesel options), Transmission (Automatic, Manual), Drivetrain (4WD, Rear Wheel Drive), Exhaust System, Fuel System

Chassis:

Suspension (Front & Rear), Steering System, Brakes (Hydraulic, ABS), Wheels & Tires

Electrical:

Wiring Diagrams, Ignition System, Charging System, Starting System, Lighting, Instrumentation, Audio System, Power Accessories

Body & HVAC:

Body Panels, Doors, Windows, Seats, Interior Trim, Heating, Ventilation, Air Conditioning (HVAC)

HVAC Details:

Component identification, refrigerant service (if applicable, though R-12 was common), blower motor, heater core, AC compressor, and control systems.

Steering System Details:

Power steering pump, steering gear/rack, tie rods, steering column, and diagnostic procedures for play or leaks.

Maintenance:

Oil Changes, Filter Replacements, Fluid Checks & Replacements, Tune-ups, Lubrication

Repair:

Engine Overhaul, Transmission Repair, Brake System Overhaul, Suspension Component Replacement, Steering System Rebuild, Electrical Component Diagnosis & Replacement

Troubleshooting:

Diagnostic Procedures, Symptom-based Troubleshooting Guides, Fault Code Interpretation (where applicable)

Specifications:

Torque Specifications, Fluid Capacities, Alignment Specifications, Diagnostic Data

Diagnostic Charts:

Includes detailed diagnostic charts and flowcharts for troubleshooting electrical and mechanical issues.

Wiring Diagrams:

Comprehensive electrical wiring diagrams for all vehicle systems, crucial for electrical diagnostics and repairs.

Brake Replacement:

Detailed steps for brake pad and shoe replacement, rotor and drum machining or replacement, brake caliper and wheel cylinder service, and bleeding the brake system.

Depth:

Comprehensive factory-derived technical information suitable for DIY mechanics and professional technicians. Covers basic maintenance to complex component overhauls and diagnostics.

Engine Rebuild Procedures:

Detailed instructions for engine disassembly, inspection, measurement, and reassembly, including bearing clearances, piston ring gaps, and valve specifications.

Body And Frame Repair:

Information on body panel alignment, corrosion repair, door mechanisms, window regulators, and frame inspection and repair (if applicable).

📊 Manual Specifications

Accessibility:

Web-browser accessible on PC, Laptop, Smartphone, Tablet with internet connection.

Quality:

Digital - High resolution, clear diagrams and text.

Binding:

N/A (Digital Access)

Paper:

N/A (Digital Access)

Searchability:

Excellent search functionality to quickly locate specific repair procedures or technical data.

⚙️ Engine Specifications

Engine Options:

4.3L (262 cu in) V6, 5.7L (350 cu in) V8, 7.4L (454 cu in) V8, 6.2L (379 cu in) Diesel V8

Horsepower Torque:

Varies by specific engine option (e.g., 5.7L V8 typically around 200-230 hp and 300-330 lb-ft torque). Detailed specs for each variant are within the manual.

Fuel Delivery:

Fuel Injection (TBI or MPFI depending on engine and configuration)

Ignition Type:

Distributorless Ignition System (DIS) or Distributor-based, depending on engine.

Displacements:

4.3L (262 cu in), 5.7L (350 cu in), 7.4L (454 cu in), 6.2L Diesel (379 cu in)

Engine Management System:

ECM (Engine Control Module) or similar, controlling fuel injection, ignition timing, and idle speed.

🔧 Transmission

Transmission Types:

4-speed Automatic (e.g., TH400, 4L80E), 5-speed Manual (e.g., NV4500, NV5600)

Optional Transmissions:

Availability varied by engine and configuration.

Drivetrain Options:

Rear-Wheel Drive (RWD) and Four-Wheel Drive (4WD) configurations available.

Transfer Case:

Manual or electric shift transfer cases for 4WD models, with detailed service procedures for their repair and maintenance.

📐 Dimensions

Body Styles:

Regular Cab, Extended Cab, Chassis Cab.

Wheelbase:

Various options available, typically 132.5 inches (Regular Cab), 150.5 inches (Extended Cab), and longer for chassis cab configurations.

Cargo Bed Options:

Long bed and standard bed configurations available, with detailed dimensions and tailgate service information.

Gvwr:

Gross Vehicle Weight Rating varies significantly based on configuration, often exceeding 8,500 lbs, up to 10,000 lbs or more for heavier duty variants.

Curb Weight:

Varies significantly by configuration, typically ranging from 4,500 lbs to over 6,000 lbs.

🛡️ Safety Features

NHTSA Ratings:

NHTSA crash test data for 1990 models may be limited or not directly comparable to modern standards. Manual will detail passive safety features available at the time.

Active Safety:

Anti-lock Braking System (ABS) - often optional on rear wheels or 4-wheel ABS.

Passive Safety:

Seat belts (lap and shoulder belts), reinforced cab structure.

💡 Technology Features

Audio System:

Factory AM/FM radio, optional cassette player, and possibly CD player integration. Manual covers basic operation and troubleshooting of the factory system.

Assistance Features:

Limited by 1990 standards. ABS was the primary advanced driver assistance feature available. Cruise control was a common option.

Connectivity Options:

N/A for modern smartphone connectivity. Manual may cover onboard diagnostic systems or trailer wiring connectors.

🔧 Maintenance

Oil Change Interval:

Typically every 3,000 to 5,000 miles or 3 to 6 months, depending on driving conditions and oil type. Refer to manual for specific engine and oil recommendations.

Transmission Fluid Change:

Check manual; often around 30,000 to 60,000 miles for automatic transmissions.

Coolant Flush:

Typically every 30,000 miles or 2 years. Manual will provide precise intervals.

Engine Oil Viscosity:

Commonly 10W-30 or 10W-40 for V8/V6 gasoline engines; Diesel engines may have specific requirements (e.g., 15W-40). Refer to manual for exact specification and API service category.

Coolant Type:

Ethylene glycol-based antifreeze, typically a green coolant for this era. Capacity varies by engine. Manual will specify type and capacity.

Brake Fluid Type:

DOT 3 brake fluid.

Power Steering Fluid:

Dexron-III or equivalent ATF for most GM vehicles of this era. Manual will confirm.

Manual Transmission Fluid:

GL-4 or GL-5 gear oil, viscosity depends on temperature (e.g., 75W-90, 80W-90). Manual will specify.

Automatic Transmission Fluid:

Dexron-III (or DEXRON-III) Automatic Transmission Fluid.

Common Problems:

Potential issues can include fuel pump failure, aging electrical components, exhaust system rust, suspension wear (ball joints, tie rods), and intake manifold gasket leaks on some V8 engines. Manual provides diagnosis for these.

📚 Vehicle History

Gm Truck Legacy:

GMC has a long-standing reputation for producing robust and capable trucks, building upon its heritage of commercial and heavy-duty vehicles.

K Series Evolution:

The 1990 K3500 is part of the GMT400 platform, representing a significant redesign from previous generations, featuring more aerodynamic styling, improved chassis dynamics, and updated powertrains.

Platform Significance:

The GMT400 platform was a significant advancement, featuring independent front suspension, rack-and-pinion steering on some models, and a more integrated body-on-frame design compared to earlier generations.

Manufacturing Location:

Produced by General Motors at various North American assembly plants.