🏷️ Basic Information

Make:

Jeep

Model:

Wrangler

Year:

1999

Platform:

TJ

Chassis Code:

TJ

👋 Introduction

Segment:

Compact SUV / Off-road vehicle

Target Audience:

Enthusiasts, DIY mechanics, professional repair shops seeking detailed information for the 1999 Jeep Wrangler TJ.

Key Competitors 1999:

Toyota RAV4, Suzuki Vitara, Ford Bronco (discontinued early in model year)

Tj Unique Selling Points:

Iconic off-road capability, solid front axle (historically), compact dimensions, convertible nature, strong aftermarket support.

Manual Advantage:

Provides authoritative, factory-level repair and maintenance procedures, crucial for preserving vehicle integrity and performance.

Value Proposition:

Empowers owners to perform complex repairs and maintenance, saving on labor costs and ensuring proper vehicle upkeep.

📋 Manual Details

Engine Systems:

Engine mechanical, lubrication, cooling, fuel, ignition, emission control, diagnosis

Transmission Systems:

Manual transmission (AX-15, NV3550), Automatic transmission (42RE), transfer case (NP231J), clutch system

Drivetrain Systems:

Front and rear axle (Dana 30, Dana 35C), driveshafts, CV joints, wheel bearings

Suspension Systems:

Front and rear suspension (leaf spring, coil spring - TJ specific), shock absorbers, control arms, sway bars, steering linkage

Brake Systems:

Front and rear brakes (disc/drum, disc/disc), parking brake, hydraulic system, ABS (if equipped)

Electrical Systems:

Wiring diagrams, battery, charging system, starting system, lighting, ignition system, instrument cluster, body electronics, fuses, relays

Body And Frame:

Body panels, doors, hood, tailgate, interior trim, seats, convertible top, frame structure, corrosion protection

HVAC Systems:

Heating, ventilation, air conditioning (HVAC) components, refrigerant system, controls

Diagnostic Procedures:

OBD-II diagnostic codes, troubleshooting guides, diagnostic testing procedures for all major systems

Estimated Pages:

Over 1500 pages (typical for comprehensive workshop manuals)

Type:

Workshop Repair Service Manual

Language:

English

Format:

Digital Download (PDF)

📖 Manual Coverage

Engine Management:

Detailed diagnostics and repair for engine control module (ECM), sensors (MAP, TPS, O2, crank, cam), actuators (injectors, ignition coils), and emission control systems.

Drivetrain Geometry:

Specifications for axle ratios, universal joint angles, driveshaft phasing, and wheel alignment parameters crucial for off-road performance.

Body Structure:

Information on body-on-frame construction, mounting points for body panels, and frame integrity checks.

Steering And Suspension Geometry:

Precise angles for caster, camber, toe, and steering axis inclination (SAI), critical for proper handling and tire wear, especially after modifications.

Routine Maintenance:

Oil changes, filter replacements (oil, air, fuel, cabin), spark plug replacement, tire rotation and balancing, fluid level checks and top-offs.

Major Repairs:

Engine overhaul (cylinder head removal/installation, piston replacement, crankshaft service), transmission overhaul, differential rebuilding, brake system overhaul (caliper/cylinder replacement, rotor resurfacing/replacement).

Diagnostics And Troubleshooting:

Step-by-step diagnostic trees for common drivability issues, electrical faults, and mechanical failures. Includes diagnostic trouble code (DTC) interpretation.

Component Replacement:

Detailed instructions for replacing clutch assembly, starter motor, alternator, fuel pump, water pump, radiator, power steering pump, AC compressor, and more.

Body And Interior:

Door panel removal, seat adjustment and replacement, convertible top repair and replacement procedures, interior trim panel removal and installation.

Depth:

Comprehensive, from basic owner maintenance to full engine and transmission rebuilds, including detailed electrical schematics and diagnostic flowcharts.

Diagnostic Capabilities:

Advanced diagnostic procedures, including use of scan tools, oscilloscope readings for sensor signals, and resistance/voltage checks for electrical components.

Special Tools:

Identification and usage instructions for specialized tools required for specific repair procedures (e.g., ball joint press, seal installers, diagnostic equipment).

📊 Manual Specifications

Type:

Searchable PDF

Resolution:

High resolution for clear text and diagrams

Printability:

Printable pages for workshop use

Quality:

Professional, factory-level detail in all illustrations and diagrams

Type:

N/A (Digital Download)

Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Code:

4.0L Inline-6 (OHV)

Displacement:

3956 cc (241 cu in)

Bore X Stroke:

98.4 mm x 86.7 mm (3.87 in x 3.41 in)

Compression Ratio:

8.8:1

Horsepower:

182 hp @ 4600 rpm (SAE Net)

Torque:

220 lb-ft @ 3200 rpm (SAE Net)

Type:

Sequential Multi-Port Fuel Injection (MPI)

Fuel Type:

Unleaded gasoline, 87 octane (minimum)

Type:

Distributorless Ignition System (DIS)

Capacity:

Approx. 11.0 US quarts (10.4 liters) with heater

Oil Capacity:

6.0 US quarts (5.7 liters) with filter change

Recommended Oil:

SAE 10W-30 API SG/SH certified

System:

Catalytic converter, EGR (Exhaust Gas Recirculation), PCV (Positive Crankcase Ventilation)

🔧 Transmission

Type:

5-speed Manual Transmission (NV3550)

Type:

4-speed Automatic Transmission (42RE)

Manual Gear Ratios:

1st: 4.11, 2nd: 2.16, 3rd: 1.30, 4th: 1.00, 5th: 0.75, Reverse: 3.75

Automatic Gear Ratios:

1st: 2.74, 2nd: 1.57, 3rd: 1.00, 4th: 0.69, Reverse: 2.20

Type:

Hydraulically actuated diaphragm spring clutch

Type:

New Process NP231J (Command-Trac four-wheel drive system)

Low Range:

2.72:1

Manual Transmission Fluid:

API GL-3 or GL-4, SAE 75W-90 synthetic gear oil (e.g., Mopar MS-9070)

Automatic Transmission Fluid:

Mopar ATF+4 (or equivalent)

Transfer Case Fluid:

Mopar NV242 Fluid (or equivalent) or Dexron III/Mercon ATF

📐 Dimensions

Wheelbase:

93.4 inches (2372 mm)

Overall Length:

151.4 inches (3845 mm)

Overall Width:

66.7 inches (1694 mm)

Overall Height:

70.0 inches (1778 mm) (soft top)

Ground Clearance:

Approx. 8.3 inches (211 mm)

Curb Weight:

Approx. 3,100 - 3,300 lbs (1406 - 1497 kg)

Gross Vehicle Weight Rating:

Approx. 4,250 lbs (1928 kg)

Towing Capacity:

2,000 lbs (907 kg)

🛡️ Safety Features

NHTSA Frontal Impact:

Not rated (vehicle design predates rigorous standardized testing)

Braking System:

Front disc brakes, rear drum brakes (standard). Optional ABS on front wheels.

Stability Control:

Not equipped

Airbags:

Driver and passenger front airbags

Seat Belts:

Front 3-point seat belts with pretensioners, rear lap belts

Rollover Protection:

Integral sport bar (roll cage) integrated into the windshield frame and B-pillars.

💡 Technology Features

Audio System:

Factory AM/FM stereo with cassette player. Optional CD player. Speaker configurations varied by trim level (e.g., 2 or 4 speakers).

Cruise Control:

Available on most models

Anti Lock Brakes:

Optional, typically on front wheels only.

🔧 Maintenance

Oil And Filter Change:

Every 5,000 miles or 6 months, whichever comes first (under normal driving conditions).

Air Filter Replacement:

Every 15,000 miles or 12 months, or as needed based on dusty conditions.

Spark Plug Replacement:

Every 30,000 miles (platinum-tipped plugs).

Transmission Fluid Change:

Manual: every 60,000 miles. Automatic: every 30,000-50,000 miles depending on use.

Transfer Case Fluid Change:

Every 60,000 miles.

Coolant Flush And Replacement:

Every 30,000 miles or 24 months.

Brake Fluid:

DOT 3 (or DOT 4 if specified by manufacturer for later models, check specific revision).

Power Steering Fluid:

Mopar Power Steering Fluid or Dexron III/Mercon ATF.

Coolant:

50/50 mixture of Mopar Antifreeze/Coolant (ethylene glycol based) and distilled water.

Engine Related:

Oil filter adapter housing leaks, intake manifold gasket leaks (especially on earlier 4.0L versions, less common on 99 TJ), exhaust manifold cracks (less common on 99).

Transmission Related:

Clutch wear, potential wear in the NV3550 5-speed manual, especially in demanding use. Automatic transmission cooler line leaks.

Suspension And Steering Related:

Worn control arm bushings, track bar bushings, steering box wear, death wobble (often caused by worn components in the front axle/steering system).

Electrical Related:

Cracked wiring harnesses due to engine heat, fuel pump relay issues, intermittent gauge failures.

Body And Frame Related:

Rust issues, particularly in unibody areas (though TJ is body-on-frame, frame rust is a concern), door hinge wear, tailgate rust.

📚 Vehicle History

Jeep Legacy:

Jeep's heritage dates back to World War II, known for ruggedness, off-road capability, and military origins.

Cj To Yj To Tj:

The TJ generation (1997-2006) replaced the YJ (1987-1995), marking a significant engineering leap with the introduction of coil spring suspension, a move back towards the CJ legacy.

Tj Key Distinctions:

Coil springs (four-link front, three-link rear with track bar), improved ride comfort, and updated powertrains compared to the YJ.

Production Start:

1996 (for the 1997 model year)

Manufacturing Location:

Toledo, Ohio, USA

Engine Introduction 4.0L:

The 4.0L 'High Output' inline-6 engine (code: ERH) was a derivative of the AMC 4.0L engine, known for its durability and torque.

🏆 Awards & Recognition

Off Road Capability:

Consistently recognized for its exceptional off-road prowess and iconic status in the SUV market.

Durability Reputation:

The 4.0L engine is widely regarded as one of the most durable and reliable engines produced by Chrysler.

Consumer Reports Historical:

Consumer Reports ratings varied, often highlighting its off-road strength but noting potential issues with ride comfort, interior noise, and build quality compared to more car-like SUVs.

Safety Certifications:

Complied with all applicable US Federal Motor Vehicle Safety Standards (FMVSS) for its model year.