Target Audience:
DIY enthusiasts, independent repair shops, fleet maintenance.
Advantage Over Print:
Convenience, instant access, searchability, potentially lower cost than original OEM manuals, always up-to-date within the licensed period.
Licensing:
Officially licensed, derived from OE (Original Equipment) materials, ensuring accuracy and completeness.
Platform Compatibility:
Compatible with PC, laptop, smartphone, and tablet devices.
Coverage Scope:
Comprehensive Service and Repair
Geographic Scope:
North America (implied by OE licensing and GMC market)
Estimated Pages:
Extensive (Software providing access to OE-level data, typically thousands of pages in original format)
Type:
Service and Repair Manual Software
Format:
Online/Digital (Web Browser Accessible)
Access Method:
Internet Connection and Web Browser
Duration:
1 Year (with options for renewal discounts)
Engine Service:
Full diagnostic, repair, and overhaul procedures for all available engines.
Drivetrain Service:
Covers manual and automatic transmissions, transfer cases (if applicable), drive axles, and differentials.
Suspension Steering:
Detailed repair procedures for front and rear suspension components, steering gear, linkages, and power steering systems.
Brake Systems:
Comprehensive coverage of hydraulic brake systems, including disc and drum brake components, parking brake, and ABS (if equipped).
Electrical Systems:
Extensive wiring diagrams, component locations, diagnostic procedures for lighting, ignition, charging, starting, and accessories.
Heating Air Conditioning:
Service and repair information for HVAC systems, including refrigerant circuits, climate control components, and blower motor.
Body And Chassis:
Information on body panels, doors, interior trim, glass, and chassis components.
Maintenance Schedules:
Factory-recommended maintenance intervals for various service items.
Troubleshooting Guides:
Systematic diagnostic procedures for identifying and resolving common and complex issues.
Repair Procedures:
Step-by-step instructions for component removal, installation, and adjustment.
Diagnostic Trouble Codes:
Explanation and interpretation of OBD-I diagnostic codes.
Wiring Diagrams:
Detailed and specific wiring diagrams for all vehicle electrical systems, crucial for diagnosing faults.
Torque Specifications:
Precise torque values for all critical fasteners across engine, chassis, and body components.
Special Tools:
Identification and usage guidelines for specialized tools required for certain repair procedures.
Engine Rebuild:
Comprehensive instructions for engine disassembly, inspection, component replacement, and reassembly.
Transmission Rebuild:
Detailed steps for overhauling automatic and manual transmissions, including clutch pack replacement and valve body service.
Diagnostic Charts:
Flowcharts and tables to systematically diagnose symptoms and pinpoint the root cause of malfunctions.
Depth:
OE-Level (Factory-derived, covering everything from basic maintenance to complete engine and transmission rebuilds).
Engine Options:
Typically included 5.7L V8 (350 ci) TBI, 7.4L V8 (454 ci) TBI. Potential for other gasoline or diesel engines depending on specific configuration.
Horsepower Torque:
Varies by engine. For example, the 5.7L V8 typically produced around 175-200 horsepower and 300-320 lb-ft of torque.
Fuel Delivery:
Throttle Body Injection (TBI) for gasoline engines.
Coolant Type:
GMC/GM specification antifreeze (e.g., Dex-Cool or equivalent for later models, but likely conventional green ethylene glycol for 1990).
Oil Type:
API service SF or SG rated, SAE 10W-30 or 10W-40 recommended for most gasoline engines. Consult manual for specific viscosity based on temperature.
Ignition Type:
Electronic Ignition System (EIS) with distributor.
Transmission Options:
Likely manual transmissions (e.g., 4-speed, 5-speed) and heavy-duty automatic transmissions (e.g., TH400, 4L80-E) depending on configuration.
Optional Transmissions:
4-speed automatic (e.g., 4L80-E) often paired with larger engines or heavy-duty applications.
Transmission Fluid:
Dexron III (or equivalent) for automatic transmissions. Manual transmission fluid (MTF) as specified by GM for manual gearboxes.
Wheelbase:
Varies, common configurations include 130-inch and 159.5-inch for 2WD models.
Curb Weight:
Varies significantly by configuration, typically starting around 4,500 - 5,000 lbs and upwards for heavy-duty models.
Gvwr:
Gross Vehicle Weight Rating (GVWR) would be specified based on payload and configuration, typically exceeding 8,600 lbs for C3500.
Crash Test Data:
NHTSA and IIHS data for 1990 C/K trucks is limited by modern standards. The GMT400 platform was designed with improved safety over its predecessor, but specific ratings may not be readily available.
ABS:
Anti-lock Braking System (ABS) was available as an option, typically on rear wheels or all four wheels depending on configuration.
Seat Belts:
Standard lap and shoulder belts.
Oil Change Interval:
Typically every 3,000-5,000 miles or 3-6 months, depending on driving conditions and oil type used. Consult manual for specifics.
Transmission Service Interval:
Automatic transmission fluid and filter service every 30,000-60,000 miles. Manual transmission fluid inspection and potential change at longer intervals.
Power Steering Fluid:
GM Power Steering Fluid (or Dexron III for some systems).
Brake Fluid:
DOT 3 brake fluid.
Common Failures:
Potential issues include fuel pump failure, intake manifold gasket leaks (on certain V8 engines), rear axle seal leaks, and wear on suspension components due to load.
Electrical Problems:
Corrosion on electrical connectors, issues with the alternator or starter, and dash warning light malfunctions can occur.
Gmc Trucks:
GMC has a long history of producing reliable trucks, often positioned as premium or professional-grade vehicles compared to Chevrolet.
Gmt400 Introduction:
The GMT400 platform was introduced for the 1988 model year for pickups, with heavy-duty models like the C3500 following shortly after, marking a significant redesign with improved aerodynamics and chassis.
Manufacturing Locations:
Assembled in various GM plants across North America.
