🏷️ Basic Information

Make:

GMC

Model:

C2500

Year:

1994

Generation:

Third Generation (GMT400)

Platform Code:

GMT400

👋 Introduction

Market Position:

A premium digital service and repair solution for owners of the 1994 GMC C2500, offering a more accessible and convenient alternative to outdated printed manuals.

Competitive Analysis:

Directly competes with traditional Haynes and Chilton repair manuals by offering a more dynamic, searchable, and up-to-date digital experience. Differentiates through licensed OE data and broad system coverage.

Key Features:

Licensed OE data, comprehensive coverage, easy online access, searchable interface, PC/laptop/smartphone/tablet compatibility, instant access, cost-effective DIY solution.

Target Audience:

DIY mechanics, truck owners, fleet managers, automotive repair enthusiasts seeking comprehensive and accurate repair information.

📋 Manual Details

Coverage Areas:

Engine, Transmission, Drivetrain, Brakes, Suspension, Steering, Electrical System, HVAC, Body, Fuel System, Cooling System, Exhaust System, Maintenance, Diagnostics, Troubleshooting

Page Count:

Estimated 1500-2500 pages (typical for OE service manuals, software provides dynamic access)

Manual Type:

Service and Repair Manual Software (Official Licensed)

Language:

English

Format:

Online/Web-based Software with 1 Year Access

Access Duration:

1 Year of access included with purchase. Discounts available for renewal.

📖 Manual Coverage

Systems Covered:

Engine Mechanical, Engine Control Systems (ECM), Fuel Injection, Ignition System, Cooling System, Lubrication System, Exhaust System, Automatic Transmission (4L60E, 4L80E), Manual Transmission (NV3500, NV4500), Transfer Case (if applicable), Front Suspension (Independent), Rear Suspension (Solid Axle), Steering System (Power Steering), Brake System (ABS, Non-ABS), Hydraulic Systems, Electrical Distribution System, Lighting, Instrumentation, Audio System, HVAC System (Air Conditioning, Heating), Body Control Modules, Chassis Electrical, Body Panels, Doors, Glass, Interior Trim, Safety Restraints (Airbags, Seatbelts)

Procedures Included:

Preventative Maintenance, Routine Service, Diagnostic Procedures, Troubleshooting Guides, Component Removal and Installation, Component Repair and Overhaul, Electrical Schematics Interpretation, Wiring Harness Repair, Clutch Adjustment and Replacement, Brake Pad and Rotor Replacement, Suspension Component Replacement, Engine Tune-Up, Fluid Level Checks and Replenishment, Filter Replacement, Belt Replacement, Emission Control System Diagnosis and Repair, Cooling System Flushing and Refill, HVAC System Servicing, Diagnostic Trouble Code (DTC) Lookup and Resolution, Component Testing (e.g., sensors, actuators)

Technical Depth:

Comprehensive, ranging from basic owner-level maintenance to advanced mechanical and electrical diagnostics and repair, suitable for DIY enthusiasts and professional technicians.

Diagnostic Tools:

Covers procedures for using OBD-I (On-Board Diagnostics) scanners and diagnostic charts for troubleshooting engine and system fault codes.

Electrical System Detail:

Detailed wiring diagrams for all systems, including engine control, lighting, accessories, power windows/locks (if equipped), trailer wiring, and instrument cluster.

📊 Manual Specifications

File Format:

Web-based application accessed via standard web browser (HTML5, CSS, JavaScript)

Print Quality:

N/A (Digital Format); Content derived from OE factory documentation, ensuring high clarity and accuracy.

Binding Type:

N/A (Digital Format)

Paper Type:

N/A (Digital Format)

Compatibility:

Compatible with any PC, laptop, smartphone, or tablet with an internet connection and web browser.

⚙️ Engine Specifications

Primary Engine:

4.3L V6 (VIN Z) Vortec

4.3L V6 L35 Specs:

Displacement: 262 cu in (4.3 L); Horsepower: 160 hp @ 4000 rpm; Torque: 235 lb-ft @ 2400 rpm; Configuration: 90-degree OHV V6; Fuel System: Throttle Body Injection (TBI) or Multi-Port Fuel Injection (MPFI) depending on specific build date/options

Optional Engine 1:

5.0L V8 (VIN X) Small Block

5.0L V8 L30 Specs:

Displacement: 305 cu in (5.0 L); Horsepower: 170 hp @ 4000 rpm; Torque: 260 lb-ft @ 2400 rpm; Configuration: 90-degree OHV V8; Fuel System: Throttle Body Injection (TBI)

Optional Engine 2:

5.7L V8 (VIN R) Vortec

5.7L V8 L31 Specs:

Displacement: 350 cu in (5.7 L); Horsepower: 200 hp @ 4000 rpm; Torque: 315 lb-ft @ 2400 rpm; Configuration: 90-degree OHV V8; Fuel System: Throttle Body Injection (TBI)

Fuel System:

Throttle Body Injection (TBI) or Multi-Port Fuel Injection (MPFI) depending on engine and specific vehicle configuration.

Engine Management:

GM's ECM (Electronic Control Module) controlling fuel injection, ignition timing, and emissions systems.

Cooling System Type:

Pressurized liquid cooling system.

Lubrication System Type:

Pressurized wet-sump system with oil pump and filter.

🔧 Transmission

Standard Transmission:

4-Speed Automatic (4L60E for light-duty C2500, 4L80E for heavy-duty C2500)

Optional Transmission:

5-Speed Manual (NV3500 for V6/5.0L V8, NV4500 for 5.7L V8 and heavy-duty applications)

Transmission Features Auto:

Electronically controlled, overdrive with lock-up torque converter.

Transmission Features Manual:

Heavy-duty construction, popular for towing and work applications.

Transfer Case Options:

Optional for 4WD models (e.g., NP241C). Manual or electronic engagement.

📐 Dimensions

Wheelbase:

131.5 inches (Standard Bed, Fleetside/Stepide)

Length:

Approximately 218.4 inches (Standard Bed)

Width:

Approximately 79.9 inches

Height:

Approximately 73.1 inches (2WD)

Curb Weight:

Approximately 4,000 - 4,500 lbs (Varies by configuration)

Gross Vehicle Weight Rating:

Up to 7,200 lbs (GVWR for C2500)

Bed Length:

78.8 inches (Standard Bed)

Front Suspension Type:

Independent Front Suspension (IFS) with torsion bars.

Rear Suspension Type:

Solid rear axle with leaf springs.

Wheel Bolt Pattern:

5x5 inches (127mm) for 1/2 ton (C2500), 6x5.5 inches (139.7mm) for 3/4 ton (C2500 heavy duty variants).

Standard Tire Size:

P235/75R16 or LT235/85R16 (depending on GVWR and configuration).

🛡️ Safety Features

NHTSA Ratings:

Not directly available for 1994 models in modern formats; designed to meet safety standards of the era. Look for specific crash test data if available from independent sources.

Active Features:

Anti-lock Braking System (ABS) - available on rear wheels or all four wheels, depending on configuration.

Passive Features:

Seatbelts, Reinforced body structure, Collapsible steering column.

💡 Technology Features

Infotainment System:

Basic AM/FM radio with cassette player. Optional CD player. Manual climate controls.

Driver Assistance Features:

Limited to ABS (on equipped models). Cruise control typically optional.

Connectivity:

No modern connectivity features like Bluetooth or USB. Analog systems.

🔧 Maintenance

Oil Change Interval:

Every 3,000-5,000 miles or 3-6 months, depending on driving conditions and oil type used. Refer to specific manual for precise recommendations.

Transmission Fluid Change Interval:

Every 30,000-50,000 miles for automatic transmissions. Manual transmissions often have longer intervals or are serviced as needed.

Coolant Change Interval:

Every 30,000 miles or 2 years for conventional coolant; longer for extended life coolants if compatible.

Spark Plug Replacement:

Refer to manual; typically 30,000-60,000 miles depending on plug type.

Engine Oil Specification:

API SG or SG/CD. Viscosity: 5W-30, 10W-30, or 10W-40 depending on ambient temperature. Capacity: 4.5-5 qts (V6), 5 qts (V8) with filter.

Transmission Fluid Specification 4L60E:

Dexron-III (GM P/N 88861056 or equivalent). Capacity: Approx. 5-7 qts for drain and fill.

Transmission Fluid Specification 4L80E:

Dexron-III (GM P/N 88861056 or equivalent). Capacity: Approx. 6-8 qts for drain and fill.

Transmission Fluid Specification Nv3500:

GM Synchromesh Transmission Fluid (GM P/N 12346194 or equivalent). Capacity: Approx. 2.5 qts.

Transmission Fluid Specification Nv4500:

GM Synchromesh Transmission Fluid (GM P/N 12346194 or equivalent). Capacity: Approx. 3.3 qts.

Coolant Specification:

Conventional Green Ethylene Glycol (GM P/N 10525474 or equivalent). 50/50 mix with distilled water. Capacity: Approx. 15-18 qts.

Brake Fluid Specification:

DOT 3.

Known Issues:

Common issues include wear on intake manifold gaskets (especially with older TBI engines), valve stem seal wear leading to oil consumption, heater core leaks (due to design placement), and potential issues with the 4L60E transmission's electronic components and clutch packs under heavy use. ABS sensor failures can also occur.

Oil Filter Part Number Typical:

AC Delco PF1218, Fram PH8A, Wix 51515 (Verify with vehicle VIN).

Air Filter Part Number Typical:

AC Delco A3073C, Fram CA5374 (Verify with vehicle VIN).

📚 Vehicle History

Brand Heritage:

GMC (General Motors Truck Company) has a long history of producing reliable trucks and commercial vehicles known for their durability and capability.

Model Evolution C2500:

The 1994 C2500 is part of the GMT400 platform, introduced in late 1987/early 1988. This generation marked a significant redesign with improved aerodynamics, a stronger chassis, and updated powertrains, becoming a very popular heavy-duty pickup.

Production Location:

Various GM assembly plants in North America (e.g., Fort Wayne, Indiana; Flint, Michigan).

Production Years Gmt400 Cseries:

1988-1998

🏆 Awards & Recognition

Recognitions:

The GMT400 platform was well-received for its robust construction and towing capabilities. Specific awards for the 1994 C2500 are not widely documented as individual accolades but rather contributions to GMC's reputation as a capable truck manufacturer in the mid-90s.