Engine Mechanical:
All engine systems, including: Engine assembly, cylinder head, block, lubrication, cooling, fuel, ignition, exhaust, emissions, engine diagnostics
Engine Performance:
Engine performance tuning, diagnostic trouble codes (DTCs), sensor data interpretation
Transmission Manual:
NV3550 5-speed manual transmission: Removal, installation, disassembly, assembly, adjustments, torque specifications
Transmission Automatic:
42RLE 4-speed automatic transmission: Removal, installation, disassembly, assembly, adjustments, torque specifications, diagnostic codes
Drivetrain:
Transfer case (NV241 GHD), front and rear axle assemblies (Dana 30/44), driveshafts, universal joints, CV joints, wheel bearings
Suspension:
Front and rear suspension systems, springs, shock absorbers, control arms, sway bars, bushings, alignment specifications
Steering:
Steering gear, power steering pump, steering column, tie rods, linkages, alignment procedures
Brakes:
Front and rear brake systems (disc/disc), brake fluid, master cylinder, calipers, rotors, pads, parking brake, ABS system diagnostics and repair
Electrical System:
Complete electrical system coverage, including: Battery, charging system, starting system, lighting (headlights, taillights, interior), fuses, relays, wiring diagrams (detailed schematics)
Body And Chassis:
Body panels, doors, hood, tailgate, windshield, convertible top, interior trim, chassis frame inspection and repair, corrosion protection
Heating Ventilation Air Conditioning HVAC:
HVAC system components, refrigerant handling, climate control system diagnostics, blower motor, A/C compressor, evaporator, condenser
Restraints:
Airbag system diagnostics, seat belts, SRS components
Maintenance:
Routine maintenance, fluid changes, filter replacements, belt inspection and replacement, lubrication points
Diagnostics Troubleshooting:
Comprehensive diagnostic flowcharts, symptom-based troubleshooting guides, fault code interpretation, electrical testing procedures
Repair Rebuild:
Step-by-step repair procedures for all major components and systems, including complete engine and transmission rebuilds
Installation Replacement:
Detailed instructions for replacing parts such as alternators, starters, water pumps, fuel injectors, brake calipers, etc.
Adjustments:
Wheel alignment, clutch adjustment, parking brake adjustment, idle speed adjustment
Depth:
Complete, in-depth coverage suitable for professional technicians and advanced DIY enthusiasts
Detail Level:
Includes detailed torque specifications, clearances, timing procedures, and diagnostic data
Oil Change:
Every 5,000 miles (8,000 km) or 6 months, whichever comes first
Air Filter Replacement:
Every 15,000 miles (24,000 km) or 12 months
Spark Plugs Replacement:
Every 30,000 miles (48,000 km) for 4.0L with copper plugs (platinum plugs may last longer, refer to specific plug type)
Transmission Fluid Change Manual:
Every 30,000 miles (48,000 km) or 24 months
Transmission Fluid Change Automatic:
Every 30,000 miles (48,000 km) or 24 months (especially under severe use)
Coolant Flush:
Every 30,000 miles (48,000 km) or 24 months
Power Steering Fluid:
ATF+4 (MS-9602)
Common Problems Engine:
Oil filter adapter leaks, exhaust manifold cracks (pre-2002 models more prone, but can occur), head gasket issues (less common on 4.0L), CPS (Crankshaft Position Sensor) failure.
Common Problems Suspension Drivetrain:
Death wobble (steering and suspension linkage issues), axle seal leaks, U-joint wear, differential gear noise.
Common Problems Electrical:
Blend door actuator failures (HVAC), window regulator failures, PCM (Powertrain Control Module) issues.
Common Problems Body:
Wrangler TJ specific leaks around windshield frame and door seals, tub corrosion in certain climates.