Engine:
4.0L Inline-6 (OHV), 2.5L 4-Cylinder (OHV), Engine mechanical, lubrication, cooling, fuel, ignition, exhaust, emission controls, engine diagnostics, performance tuning
Transmission:
4-speed Automatic (AW4/42RE), 5-speed Manual (AX-15/NV3550), Clutch, torque converter, transmission overhaul, service, adjustments, diagnostics
Drivetrain:
Front Axle (Dana 30), Rear Axle (Chrysler 8.25, Dana 35), Transfer Case (NP231, NP242), Driveshafts, U-joints, differentials, 4WD system operation and service
Suspension:
Front Leaf Spring and Solid Axle (early models), Front Coil Spring and Solid Axle (later XJ), Rear Leaf Spring, shock absorbers, springs, bushings, alignment specifications
Steering:
Power steering system, steering gear, tie rods, steering column, steering angle sensor (if applicable)
Brakes:
Front Disc Brakes, Rear Drum Brakes, ABS (if equipped), hydraulic system, parking brake, master cylinder, calipers, wheel cylinders, brake bleeding procedures
Electrical:
Battery, charging system, starting system, lighting, instrumentation, body control modules, ignition system, engine control module (ECM), wiring diagrams, fuses, relays, diagnostic trouble codes (DTCs)
HVAC:
Heating, Ventilation, and Air Conditioning system, components, operation, troubleshooting, refrigerant handling
Body:
Exterior body panels, doors, windows, interior trim, seats, bumpers, seals, glass replacement, body repair procedures
Chassis:
Frame construction, body mounts, corrosion protection
Maintenance:
Oil changes, filter replacements, fluid checks and top-offs, lubrication points, tire rotation, spark plug replacement, belt inspection and replacement
Diagnostics:
Step-by-step diagnostic procedures for all major systems, troubleshooting charts, fault code interpretation
Repair:
Detailed repair instructions for component replacement, overhaul, and adjustment
Overhaul:
Complete engine, transmission, and axle overhaul procedures with torque specifications and tolerances
Installation:
Procedures for installing replacement parts and accessories
Wiring Diagrams:
Comprehensive, high-quality wiring schematics for all electrical systems
Fuel System Service:
Fuel pump testing, fuel filter replacement, fuel injector diagnosis and cleaning, fuel tank service.
Exhaust System Service:
Catalytic converter replacement, muffler and pipe replacement, oxygen sensor diagnosis and replacement.
Cooling System Service:
Radiator, water pump, thermostat, hoses, coolant flush and fill procedures, heater core service.
Tire Wheel Specifications:
Recommended tire sizes (e.g., P215/75R15, P225/75R15), wheel bolt patterns (5x4.5 inches or 5x114.3mm), torque specifications.
Torque Specifications:
Comprehensive torque specifications for all critical fasteners throughout the vehicle.
Troubleshooting Charts:
Detailed 'No Start', 'Rough Running', 'No Power', 'No Brakes' type troubleshooting flowcharts.
Body And Trim Removal:
Instructions for removing interior panels, exterior trim pieces, bumpers, and body components.
Chassis And Frame Inspection:
Guidelines for inspecting the unibody structure for damage or corrosion.
Depth:
Expert-level, suitable for professional technicians and advanced DIY enthusiasts. Covers everything from routine maintenance to complete engine and transmission rebuilds.
Special Tools:
Lists and descriptions of special tools required for specific repair procedures.
Oil Change Interval:
Every 3,000-7,500 miles or 6-12 months, depending on driving conditions and oil type (refer to manual for exact recommendations).
Tire Rotation Interval:
Every 7,500 miles (12,000 km)
Transmission Fluid Change Interval:
Every 30,000-60,000 miles (48,000-97,000 km) for automatic, depending on usage. Manual transmission fluid inspection as per manual.
Coolant Change Interval:
Every 30,000-50,000 miles (48,000-80,000 km) or 2-3 years.
Engine Oil Spec:
API SG or higher. SAE 10W-30 or SAE 5W-30 for the 4.0L engine (refer to manual for temperature variations). SAE 10W-30 for the 2.5L.
Transmission Fluid Auto Spec:
ATF+3 (Chrysler specification) or equivalent.
Transmission Fluid Manual Spec:
Refer to manual, typically GL-3 or GL-4 gear oil for AX-15, GL-4 for NV3550.
Coolant Spec:
Mopar Antifreeze/Coolant (Green) or equivalent ethylene glycol based coolant.
Brake Fluid Spec:
DOT 3 or DOT 4 brake fluid.
Common Problems:
Head gasket leaks (especially on early 4.0L engines with 7120 head), cracked cylinder heads (later 4.0L engines), exhaust manifold cracks, radiator leaks, water pump failures, power steering pump issues, worn leaf spring bushings, rear main seal leaks, rust (particularly on unibody frame rails and rocker panels).
Electrical Quirks:
Intermittent electrical gremlins due to aging wiring harnesses, faulty grounds, and sensor failures are not uncommon.