Target Audience:
DIY mechanics, professional repair shops, fleet maintenance
Advantage Over Print:
Instant access, searchable content, multimedia integration (potential), lower cost of distribution
Licensing:
Officially licensed, derived from OE materials
Convenience:
Accessible anywhere with internet, eliminates need for physical storage
Engine Systems:
Engine mechanical, fuel injection, ignition, cooling, lubrication, exhaust, emissions
Drivetrain Systems:
Transmission (manual/automatic), transfer case, drive axles, driveshafts, differentials
Suspension Steering:
Front and rear suspension, steering gear, power steering system
Braking Systems:
Front and rear brakes (disc/drum), parking brake, ABS (if equipped)
Electrical Systems:
Battery, charging system, starting system, lighting, gauges, body control modules, accessories
HVAC Systems:
Heating, ventilation, and air conditioning (HVAC) operation and repair
Body Structure Repair:
Body panels, chassis frame, interior trim, exterior trim, glass, doors, latches
Maintenance Procedures:
Oil changes, filter replacements, fluid checks and top-offs, tire rotations, inspections
Repair Procedures:
Engine component replacement, transmission overhaul, brake caliper replacement, suspension bushing replacement, electrical component diagnosis and repair
Diagnostic Procedures:
Troubleshooting guides, symptom-based diagnostics, fault code interpretation (OBD-I)
Special Tool Procedures:
Identification and usage of specialized tools for specific repairs
Climate Control Repair:
Diagnosis and repair of A/C system components, heater core, blower motor, controls.
Fuel System Service:
Fuel pump replacement, fuel filter replacement, injector testing and cleaning.
Cooling System Service:
Radiator replacement, water pump replacement, thermostat replacement, fan clutch diagnosis.
Depth:
Factory-level detail, suitable for professional technicians and advanced DIYers
Electrical Diagrams:
Inclusion of comprehensive wiring diagrams for all systems
Torque Specifications:
Precise torque values for all fasteners
Diagnostic Charts:
Detailed diagnostic flowcharts and decision trees
Chassis Alignment Specs:
Detailed alignment specifications for front and rear suspensions.
Wheel Tire Specifications:
Wheel sizes, bolt patterns (e.g., 8-lug 16" or 17"), tire pressure recommendations.
Engine Mechanical Rebuild:
Complete engine overhaul procedures, including piston, ring, bearing, and valve train installation.
Engine Options:
4.3L V6, 5.0L V8, 5.7L V8, 7.4L V8 (refer to specific VIN for exact engine)
Engine Code Example 4 3L:
LG4 (or similar for 5.0L), L05 (for 5.7L), L19 (for 7.4L) - Varies by specific build
Horsepower Range:
Approx. 160 HP (4.3L V6) to 230 HP (7.4L V8) - Varies by engine and configuration
Torque Range:
Approx. 230 lb-ft (4.3L V6) to 380 lb-ft (7.4L V8) - Varies by engine and configuration
Fuel Delivery:
Electronic Fuel Injection (EFI) / Throttle Body Injection (TBI)
Fuel Type:
Unleaded Gasoline
Ignition Type:
Distributorless Ignition System (DIS) or Distributor Ignition (DI) depending on engine option
Transmission Options:
4-speed Manual (e.g., NV4500), 4-speed Automatic (e.g., 700R4/4L60, 4L80E for heavier duty)
Transfer Case Options:
New Process NP241 (part-time 4WD), NP208 (full-time 4WD - less common on K2500)
Transmission Fluid Spec Auto:
Dexron-III (or equivalent)
Transmission Fluid Spec Manual:
GL-4 Gear Oil (specific viscosity depends on application, consult manual)
Audio System:
AM/FM stereo, cassette player, optional CD player. Basic radio controls, potentially with graphic equalizer.
Dashboard Features:
Analog gauges for speedometer, tachometer (optional), fuel, oil pressure, coolant temperature, voltmeter.
Cruise Control:
Optional feature on many models.
Onboard Diagnostics:
OBD-I (On-Board Diagnostics, First Generation) system for engine fault detection.
Oil Change Interval:
Typically every 3,000-5,000 miles or 3-6 months, depending on driving conditions and oil type used.
Transmission Fluid Change:
Check manual, typically every 30,000-60,000 miles for automatic transmissions.
Coolant Flush:
Every 30,000-50,000 miles or 2-3 years.
Engine Oil Spec:
API SG or higher, viscosity grade such as 5W-30, 10W-30, or 10W-40 depending on ambient temperature (consult manual).
Coolant Spec:
Ethylene glycol based coolant, typically a 50/50 mix with distilled water. Check manual for specific type.
Common Wear Items:
Ball joints, tie rod ends, sway bar links, U-joints, brake wear, fuel pump, radiator, exhaust components.
Electrical Gremlins:
Older vehicles can develop electrical issues due to aging wiring and components.
Engine Specific Concerns:
Certain engine variants may have specific known issues (e.g., oil leaks, intake manifold gasket issues on some V8s).
Gmc Truck Legacy:
GMC has a long history of producing trucks and commercial vehicles, known for durability and capability.
Gmt400 Introduction:
The 1990 model year marked the introduction of the all-new GMT400 platform, replacing the older C/K line. This platform featured a more modern, aerodynamic design and improved chassis dynamics.
Manufacturing Location:
Various GM assembly plants in North America (e.g., Fort Wayne, Indiana; Oshawa, Ontario).
