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Introduction
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Market Position
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Segment:
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Compact SUV / Off-Road Vehicle
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Key Selling Points:
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Iconic off-road capability, legendary styling, open-air driving experience, robust chassis.
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Competitive Analysis
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Primary Competitors:
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Toyota FJ Cruiser, Nissan Xterra, Land Rover Defender (older generations), Ford Bronco (older generations).
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Key Features
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Jk Generation Highlights:
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Newer chassis design compared to TJ, improved on-road manners, wider track, available four-door (Unlimited) model, more powerful engine options, enhanced interior comfort and features.
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Manual Coverage
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Systems Covered
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Powertrain:
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Engine mechanical, fuel system, cooling system, lubrication system, ignition system, exhaust system, emissions control systems.
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Transmission Drivetrain:
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Manual transmission (NSG370), Automatic transmission (42RLE), Transfer case (NV241OR), Drivelines, Axles (Dana 30 front, Dana 44 rear), Wheel bearings.
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Chassis Suspension Steering:
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Front and rear suspension (Solid axles, coil springs, shock absorbers, stabilizer bars), Steering system (Power steering pump, steering gear, steering column), Brakes (Front discs, rear discs, ABS, parking brake).
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Electrical Electronics:
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Battery, charging system, starter motor, lighting system (headlights, taillights, interior lights), Fuses and relays, Wiring diagrams, Powertrain Control Module (PCM), Body Control Module (BCM), Instrument cluster, Audio system, HVAC controls, Power windows, locks, mirrors.
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Bodywork Exterior Interior:
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Body panels, Doors, Hood, Tailgate, Bumpers, Seats, Trim panels, Convertible top system (soft top and optional hard top), Glass, HVAC system components (blower motor, evaporator, heater core), Safety systems (Airbags, seatbelts).
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Procedures Included
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Maintenance:
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Scheduled maintenance, Oil and filter changes, Air filter replacement, Spark plug replacement, Coolant flush and fill, Brake fluid flush, Transmission fluid change, Differential fluid change, Transfer case fluid change, Belt inspection and replacement, Wiper blade replacement.
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Repair Diagnostics:
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Engine diagnostics and repair, Fuel injection system troubleshooting, Ignition system diagnosis, Transmission repair and overhaul, Brake system repair (pads, rotors, calipers, lines), Suspension component replacement, Steering system repair, Electrical system troubleshooting (using wiring diagrams), Body panel repair and replacement, Convertible top repair.
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Troubleshooting:
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Diagnostic trouble codes (DTCs) interpretation and resolution, Component testing procedures, Wiring harness continuity checks, Sensor testing and replacement, Actuator testing.
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Technical Depth
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Depth:
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Comprehensive (covering basic maintenance to major component overhaul and advanced electrical diagnostics).
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Dimensions
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Exterior
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Wheelbase 2Door:
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95.4 inches (2423 mm)
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Wheelbase 4Door:
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116.0 inches (2946 mm)
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Length 2Door:
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163.8 inches (4161 mm)
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Length 4Door:
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183.4 inches (4658 mm)
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Width:
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73.7 inches (1872 mm) (excluding mirrors)
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Height:
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72.4 inches (1839 mm) (with hardtop)
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Cargo
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Cargo Volume 2Door:
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8.6 cu ft (seats up), 55.4 cu ft (seats down)
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Cargo Volume 4Door:
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31.5 cu ft (seats up), 70.6 cu ft (seats down)
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Weights
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Curb Weight 2Door:
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4,075 - 4,163 lbs (1,848 - 1,888 kg)
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Curb Weight 4Door:
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4,355 - 4,554 lbs (1,975 - 2,066 kg)
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Towing Capacity:
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3,500 lbs (1,588 kg) (all models)
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Maintenance
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Service Intervals
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Oil Change Interval:
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Every 3,750 miles or 6 months (severe duty) / Every 7,500 miles or 12 months (normal duty) - consult manual for specific engine.
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Tire Rotation Interval:
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Every 7,500 miles or 6 months
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Engine Air Filter Replacement:
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Every 15,000 miles or 12 months (severe duty) / Every 30,000 miles or 24 months (normal duty)
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Transmission Fluid Change:
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Automatic: Every 60,000 miles / Manual: Inspect periodically, replace as needed or at higher mileages.
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Fluid Specifications
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Engine Oil Type:
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SAE 5W-30 (Synthetic recommended for 3.8L and 3.6L)
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Engine Oil Capacity:
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4.7 US quarts (4.4 L) for 3.8L / 5.5 US quarts (5.2 L) for 3.6L
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Coolant Type:
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Mopar OAT (Orange) Antifreeze/Coolant
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Transmission Fluid Type Auto:
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ATF+4 (MS-9602)
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Transmission Fluid Type Manual:
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MS-9224 (or equivalent API GL-4, SAE 75W-80W)
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Transfer Case Fluid:
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Mopar NV241 Transfer Case Lubricant (or equivalent SAE 75W-80W GL-4)
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Differential Fluid:
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API GL-5, SAE 80W-90 (with friction modifier for limited-slip differentials)
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Known Issues
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Common Complaints Jk:
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Death wobble (steering/suspension component wear), exhaust manifold cracks (3.8L), interior water leaks (soft top/hard top seals), brake pad wear, oil filter housing leaks (3.6L).
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