Segment:
Compact SUV, Off-Road Vehicle
Target Audience:
Off-road enthusiasts, adventure seekers, individuals requiring a durable and capable vehicle.
Key Competitors 1999:
Toyota 4Runner, Ford Bronco (last year), Nissan Pathfinder, Chevrolet Blazer.
Off Road Capability:
Solid front and rear axles, robust 4x4 system (Command-Trac NV231 transfer case), high ground clearance, short wheelbase.
Design:
Iconic Jeep styling, removable doors and top (full doors or half doors, soft top or hardtop options).
Engine Mechanical:
Engine assembly, disassembly, diagnosis, repair, lubrication system, cooling system, fuel system, exhaust system, emissions control.
Transmission Drivetrain:
Manual transmission (AX-5, NV3550), automatic transmission (30RH), transfer case (NP231), drivelines, axles, differentials, propeller shafts, U-joints.
Brakes:
Front disc brakes, rear drum brakes (standard), ABS system (if equipped), hydraulic system, parking brake, bleeding procedures.
Suspension Steering:
Front solid axle (Dana 30), rear solid axle (Dana 35c), coil springs, shock absorbers, steering gear, power steering system, alignment specifications.
Electrical:
Battery, charging system (alternator), starting system (starter motor), ignition system, lighting system, instrumentation, fuses, relays, wiring diagrams, body control modules.
Body Chassis:
Frame, body panels, doors, hood, windshield, rear gate, interior trim, seats, convertible top, bumpers, corrosion protection.
Maintenance Procedures:
Oil changes, filter replacements, fluid checks and top-offs, tire rotation, spark plug replacement, belt inspection and replacement, brake pad replacement.
Diagnostic Procedures:
Troubleshooting charts for common drivability issues, electrical faults, cooling system problems, brake issues, using diagnostic tools.
Repair Procedures:
Step-by-step instructions for component removal, repair, and reinstallation for all major vehicle systems.
Calibration Adjustment:
Wheel alignment, throttle linkage adjustment, parking brake adjustment, headlight aiming.
Depth:
Comprehensive: Covers routine maintenance, diagnostics, complete component overhauls, and major system repairs. Suitable for professional technicians and advanced DIY enthusiasts.
Engine Code Base:
4.0L Inline-6 (VIN Z)
Engine Displacement Base:
3957 cc (241.4 cu in)
Engine Block Material Base:
Cast Iron
Engine Head Material Base:
Cast Iron
Engine Configuration Base:
Inline 6-cylinder, overhead valves (OHV)
Bore X Stroke Base:
98.4 mm x 86.7 mm (3.87 in x 3.41 in)
Compression Ratio Base:
8.8:1
Horsepower Base:
182 hp @ 4600 rpm
Torque Base:
220 lb-ft @ 3200 rpm
Fuel System Base:
Sequential Multiport Electronic Fuel Injection (MPI)
Ignition System Base:
Distributorless Ignition System (DIS) with coil-on-plug (COP) technology from 1999 onwards.
Emissions Control Base:
Catalytic converter, Oxygen sensors, EGR (Exhaust Gas Recirculation) system.
Engine Code Optional:
2.5L Inline-4 (VIN T)
Engine Displacement Optional:
2507 cc (153 cu in)
Horsepower Optional:
114 hp @ 4700 rpm
Torque Optional:
145 lb-ft @ 3500 rpm
Fuel System Optional:
Multiport Fuel Injection (MPI)
Transmission Type Standard:
5-Speed Manual (AX-5, or NV3550 for later 4.0L models)
Gear Ratios Ax5:
AX-5: 1st: 3.97, 2nd: 2.32, 3rd: 1.54, 4th: 1.00, 5th: 0.85
Gear Ratios Nv3550:
NV3550: 1st: 4.01, 2nd: 2.32, 3rd: 1.40, 4th: 1.00, 5th: 0.78
Transmission Type Optional:
3-Speed Automatic (30RH)
Transfer Case:
New Process NP231 Command-Trac (Part-time, 2-speed with 2.72:1 low range)
Manual Transmission Fluid Ax5:
API GL-5, SAE 75W-90 Gear Oil (or specific Chrysler fluid)
Automatic Transmission Fluid:
ATF+4 (Mopar)
Manual Transmission Capacity:
Approx. 2.0 L (2.1 qts)
Automatic Transmission Capacity:
Approx. 7.0 L (7.4 qts)
NHTSA Rollover Resistance:
2-star rating (typical for this era and vehicle type)
Braking System:
Front ventilated disc, rear drum. Optional Anti-lock Braking System (ABS) on rear wheels only.
Airbags:
Driver and passenger front airbags.
Seat Belts:
Three-point front seat belts with pretensioners, lap belts for rear passengers.
Roll Cage:
Integrated roll cage structure for enhanced occupant protection in rollovers.
Oil Change Interval:
Every 3,000 miles (4,800 km) or 3 months. Check manual for synthetic oil recommendations and extended intervals.
Tire Rotation Interval:
Every 5,000 - 7,500 miles (8,000 - 12,000 km)
Transmission Fluid Change Interval:
Manual: Every 30,000 - 60,000 miles (48,000 - 96,000 km) depending on usage. Automatic: Every 30,000 - 50,000 miles (48,000 - 80,000 km).
Coolant Change Interval:
Every 30,000 miles (48,000 km) or 2 years
Spark Plug Replacement:
Every 30,000 miles (48,000 km) for standard plugs, potentially longer for platinum/iridium.
Engine Oil Specification:
API SG or higher, SAE 10W-30 (check owner's manual for specific temp range recommendations).
Engine Coolant Specification:
Chrysler Formula 05103530AA (Green) or equivalent HOAT coolant.
Engine Oil Capacity:
5.0 US quarts (4.7 L) with filter for 4.0L I6
Coolant Capacity:
Approx. 11.0 US quarts (10.4 L) for 4.0L I6
Fuel Tank Capacity:
15.0 US gallons (56.8 L)
Common Issues 40L:
Cracked cylinder heads (early 4.0L engines), oil filter housing leaks, exhaust manifold cracks, tappet noise.
Common Issues Suspension Steering:
Worn steering box, track bar bushings, ball joints, control arm bushings.
Common Issues Electrical:
Faulty ASD (Auto Shutdown) relay, instrument cluster issues, power window/lock failures.
Common Issues Transfer Case:
Chain stretch in NP231, worn shift linkage.
Jeep Legacy:
Direct descendant of the WWII Willys Jeep, known for ruggedness and off-road prowess.
Tj Generation Launch:
Introduced for the 1997 model year, replacing the YJ generation. The TJ marked a significant return to the CJ-style round headlights and coil-spring suspension.
Tj Key Changes 1999:
1999 saw the introduction of the optional NV3550 5-speed manual transmission for 4.0L engines, replacing the AX-5 in many configurations for improved durability and lower gearing.
Production Location:
Toledo, Ohio, USA
