🏷️ Basic Information

Make:

Jeep

Model:

Wrangler

Year:

2004

Model Code:

TJ

👋 Introduction

Segment:

Compact SUV, Off-Road Vehicle

Brand Perception:

Iconic off-road capability, ruggedness, and go-anywhere attitude.

Direct Competitors:

Toyota 4Runner, Nissan Xterra, Suzuki Vitara (at the time)

Platform:

Jeep TJ platform (short wheelbase, coil-sprung solid axles)

Off Road Capability:

Command-Trac NV241 GII transfer case, Dana axles, high ground clearance, short overhangs, available locking differentials.

Body Styles:

2-door (short wheelbase)

Customization:

Highly customizable with a vast aftermarket for modifications.

📋 Manual Details

Manual Type:

Digital Service Repair Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine:

4.0L Straight-6 (MPI), 2.4L DOHC Inline-4 (MPI)

Transmission:

42RLE Automatic, NV3550 Manual

Drivetrain:

Four-Wheel Drive (4WD) Systems, Transfer Case (NV241 GII), Dana 30 Front Axle, Dana 44 Rear Axle

Suspension:

Front and Rear Solid Axle Suspension, Coil Springs, Shock Absorbers, Control Arms, Track Bars

Brakes:

Front Disc Brakes, Rear Drum Brakes (standard), Optional Front and Rear Disc Brakes, ABS System

Steering:

Power Steering System, Steering Gear Box

Electrical:

Battery, Charging System, Starting System, Ignition System, Lighting, Instrumentation, Power Accessories, Body Control Module (BCM)

Fuel System:

Fuel Pump, Fuel Filter, Fuel Injectors, Evaporative Emission Control (EVAP) System

Cooling System:

Radiator, Coolant Fan, Water Pump, Thermostat

Exhaust System:

Exhaust Manifold, Catalytic Converter, Muffler

HVAC:

Heating, Ventilation, and Air Conditioning (HVAC) System, Evaporator, Condenser, Blower Motor

Body And Interior:

Body Panels, Doors, Hood, Hardtop/Soft Top Removal and Installation, Seats, Interior Trim

Maintenance:

Oil Changes, Fluid Checks and Replacements, Filter Replacements, Belt Inspections and Replacements, Spark Plug Replacement, Brake Pad Replacement

Troubleshooting:

Diagnostic Procedures for Common Issues, DTC (Diagnostic Trouble Code) Interpretation and Resolution

Repair:

Engine Overhaul, Transmission Rebuild, Brake System Repair, Suspension Component Replacement, Electrical System Diagnosis and Repair, Body Panel Repair

Diagnostics:

On-Board Diagnostics (OBD-II) System, Scan Tool Usage, Sensor Testing, Actuator Testing

Specifications:

Torque Specifications for Fasteners, Fluid Capacities, Electrical Schematics, Component Dimensions

Technical Data:

Wiring Diagrams, Vacuum Diagrams, Component Testing Procedures, Alignment Specifications

Depth:

Comprehensive, covering basic maintenance to full engine and transmission rebuilds. Includes detailed diagnostic procedures and electrical schematics.

📊 Manual Specifications

File Type:

PDF

Searchable:

Yes (Text-searchable)

Printable:

Yes

Quality:

High-resolution digital scans of original factory service manuals, ensuring clarity of text and diagrams.

Binding:

N/A (Digital Format)

Paper:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Name:

4.0L Inline-6 (High Output)

Engine Code:

AMC 242

Displacement:

3952 cc (242 cubic inches)

Configuration:

Inline 6-cylinder, Overhead Valve (OHV)

Bore X Stroke:

98.4 mm x 86.6 mm (3.875 in x 3.41 in)

Compression Ratio:

8.75:1

Horsepower:

190 hp @ 4600 rpm

Torque:

235 lb-ft @ 3200 rpm

Fuel Delivery:

Multi-Point Fuel Injection (MPI)

Fuel Type:

Unleaded Regular (87 Octane recommended)

Engine Name:

2.4L Inline-4 (World Engine)

Engine Code:

ED3

Displacement:

2429 cc (148 cubic inches)

Configuration:

Inline 4-cylinder, Dual Overhead Cam (DOHC), 16 valves

Horsepower:

147 hp @ 5200 rpm

Torque:

165 lb-ft @ 3800 rpm

🔧 Transmission

Transmission Type:

NV3550 5-Speed Manual

Transmission Type:

42RLE 4-Speed Automatic

Transfer Case:

NV241 GII Command-Trac (2 High, 4 High Part-Time, 4 High Full-Time, 4 Low Part-Time)

Clutch Type:

Hydraulic Actuated Single Dry Plate (Manual Transmission)

📐 Dimensions

Wheelbase:

93.4 inches (2372 mm)

Length:

150.9 inches (3833 mm)

Width:

66.5 inches (1689 mm)

Height:

71.9 inches (1826 mm) (with hardtop)

Ground Clearance:

8.8 inches (224 mm)

Approach Angle:

41.7 degrees

Departure Angle:

35.3 degrees

Breakover Angle:

26.1 degrees

Cargo Volume Behind Front Seats:

48.7 cubic feet

Curb Weight:

Approx. 3500-3700 lbs (depending on configuration)

Gross Vehicle Weight Rating:

Approx. 4850 lbs

Towing Capacity:

2000 lbs

🛡️ Safety Features

NHTSA Rollover Resistance:

3-star rating (for 2004 model year)

ABS:

Optional Anti-lock Braking System (ABS) on rear wheels, standard on rear-disc brake models.

Traction Control:

Not standard on all models.

Airbags:

Driver and Passenger Frontal Airbags

Seatbelts:

Three-point seat belts with pretensioners, rear seat belts.

Rollover Protection:

Integral sport bar with sport cage structure.

💡 Technology Features

Audio System:

Factory AM/FM/CD player, optional Infinity sound system. Aftermarket head units are common.

Navigation:

Not available from the factory. Aftermarket GPS solutions are common.

Cruise Control:

Available on most models.

Auxiliary Input:

Not standard. Aftermarket solutions exist.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 6 months (severe duty), 7,500 miles or 12 months (normal duty), consult manual for specifics.

Engine Oil Type:

SAE 10W-30 (preferred for 4.0L and 2.4L engines), consult owner's manual for exact specification (e.g., API certified).

Engine Oil Capacity:

4.0L: 6 quarts (5.7 liters) with filter. 2.4L: 5 quarts (4.7 liters) with filter.

Coolant Type:

Ethylene Glycol based coolant, Mopar Antifreeze/Coolant (MS-9769) or equivalent.

Coolant Capacity:

Approx. 11.9 quarts (11.2 liters) for 4.0L.

Transmission Fluid Type Auto:

ATF+4 (MS-9602)

Transmission Fluid Capacity Auto:

Approx. 7.7 quarts (7.3 liters) for 42RLE (dry fill).

Transmission Fluid Type Manual:

MS-9224 (Manual Transmission Lubricant)

Transfer Case Fluid Type:

MS-9224 (Manual Transmission Lubricant)

Differential Fluid Type:

API GL-5, SAE 75W-90 (front and rear differentials), consult manual for specific capacity and additive requirements (e.g., limited-slip additive).

Common Problems:

Oil leaks (valve cover gasket, oil pan gasket), cooling system issues (heater core leaks, radiator leaks), exhaust manifold cracks (especially on 4.0L), rear main seal leaks, door seal leaks, death wobble (suspension/steering component wear).

Tj Specific Issues:

Body tub rust, catalytic converter failure, fuel pump issues, interior trim wear.

Recommended Inspections:

Regular inspection of suspension components, steering linkage, exhaust system, and body for rust. Check for leaks at all fluid points.

📚 Vehicle History

Jeep Legacy:

Jeep has a long and storied history in off-road vehicle production, dating back to World War II. The Wrangler is the direct spiritual successor to the original Jeep CJ.

Tj Generation Introduction:

The TJ Wrangler was introduced for the 1997 model year, replacing the YJ. It marked a significant departure with the return to round headlights and the adoption of coil springs for improved ride and off-road articulation.

2004 Updates:

For 2004, Jeep introduced the 2.4L 'World Engine' as an option, aimed at improving fuel economy. Minor interior and exterior refinements were also common throughout the TJ's lifecycle.

Manufacturing Location:

Toledo, Ohio, USA

Production Years:

1997-2006 (TJ generation)

🏆 Awards & Recognition

Off Road Awards:

Consistently recognized by off-road publications and enthusiasts for its superior capability and aftermarket support. Often featured in 'Best Off-Road Vehicle' lists.

Consumer Ratings:

High customer satisfaction for off-road performance, but can vary for on-road comfort and reliability depending on specific model year and maintenance history.