Engine:
All engine variants, including troubleshooting, diagnostics, repair, and overhaul.
Transmission:
Manual and Automatic transmission systems: removal, installation, overhaul, and troubleshooting.
Drivetrain:
Transfer case, axles (Dana 30 front, Dana 35 rear standard, Dana 44 optional), driveshafts, CV joints, and wheel bearings.
Suspension:
Front and rear suspension components, including springs (coil springs standard), shock absorbers, control arms, sway bars, and steering linkages.
Steering:
Power steering system: pump, hoses, steering gear, and troubleshooting.
Brakes:
Front and rear brake systems (disc front, drum rear standard, optional discs rear): hydraulic system, calipers, pads, rotors, lines, and ABS.
Electrical:
Complete electrical system: wiring diagrams, charging system, starting system, ignition system, lighting, instruments, and accessories.
Body And Chassis:
Body construction, frame, doors, hood, tailgate, fenders, bumpers, interior trim, seats, and convertible top system.
Heating And Cooling:
HVAC system: A/C, heater core, blower motor, controls, and refrigerant servicing.
Fuel System:
Fuel tank, fuel pump, fuel injectors, fuel filter, and evaporative emissions system.
Exhaust System:
Exhaust manifold, catalytic converter, muffler, and pipes.
Preventive Maintenance:
Scheduled maintenance, fluid changes, filter replacements, inspections, lubrication.
Troubleshooting:
Diagnostic charts and procedures for common and uncommon issues across all systems.
Repair And Rebuild:
Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation.
Adjustments:
Engine tuning, brake adjustments, clutch adjustments, steering alignment procedures.
Diagnostics:
OBD-II system diagnostics, sensor testing, component testing, fault code interpretation.
Wiring Diagrams:
Detailed color-coded wiring schematics for all electrical systems.
Depth:
Comprehensive, covering basic maintenance to full engine and transmission rebuilds. Includes diagnostic procedures and specifications.
Wheelbase Short Wheelbase:
93.4 inches (2372 mm)
Wheelbase Long Wheelbase:
103.4 inches (2626 mm) - Rubicon Unlimited / LJ
Overall Length Short Wheelbase:
151.7 inches (3853 mm)
Overall Width:
66.7 inches (1694 mm)
Overall Height:
71.5 inches (1816 mm)
Curb Weight Est Short Wheelbase:
3,500 - 3,800 lbs (1588 - 1724 kg)
Gross Vehicle Weight Rating Gvwr Est:
4,500 - 4,800 lbs (2041 - 2177 kg)
Oil Change Interval Miles:
3,000 - 5,000 miles (depending on driving conditions)
Transmission Fluid Change Auto Miles:
60,000 - 100,000 miles (ATF+4 is a long-life fluid)
Transmission Fluid Change Manual Miles:
60,000 - 100,000 miles
Transfer Case Fluid Change Miles:
60,000 - 100,000 miles
Coolant Flush Miles:
Every 5 years or 100,000 miles
Engine Oil Spec:
API Certified SAE 10W-30 (for 4.0L I6)
Engine Oil Capacity Quarts:
6.0 quarts (5.7 liters) with filter (4.0L I6)
Coolant Type:
Mopar Antifreeze/Coolant (5/150 Formula) or equivalent (typically HOAT orange/pink)
Common Wear Items:
U-joints, ball joints, tie rod ends, clutch wear (manual transmission), water pump seals, radiator leaks.
Engine Specific Concerns:
Cracking cylinder heads (early 4.0L I6 models, though less common on TJ than XJ), rear main seal leaks, tappet noise.
Transmission Specific Concerns:
42RLE harsh shifting, potential torque converter issues. NV3550 generally robust but clutch wear.
Chassis Corrosion:
Frame rust, particularly around rear spring perches and fuel tank mounts, common in rust-belt regions.