Engine:
All Engine Overhauls, Diagnostics, Tuning, Cooling, Lubrication, Fuel Injection, Ignition
Transmission:
Automatic Transmission (42RE, 44RE, 46RE), Transfer Case (NV231, NV242, NV249), Drivelines
Brakes:
Front & Rear Disc Brakes, ABS System, Parking Brake
Suspension:
Front Solid Axle (Dana 30/35), Rear Axle (Dana 35), Springs, Shock Absorbers, Steering System
Electrical:
Wiring Diagrams, Lighting, Instruments, Power Distribution, Ignition System, Starting System, Charging System, ECU Diagnostics
Body And Chassis:
Frame, Body Panels, Doors, Windows, Seats, HVAC System, Exterior Trim, Interior Trim
Climate Control:
HVAC blower motor, resistor, evaporator, condenser, compressor, refrigerant charging, heater core replacement.
Fuel System:
Fuel pump, fuel injectors, fuel pressure regulator, fuel filter replacement, fuel tank servicing.
Ignition System:
Spark plugs, ignition coils, distributor (on some 4.0L engines), crank and cam position sensors.
Frame:
Inspection, repair, and maintenance of the unibody structure.
Interior:
Seat removal and repair, dashboard disassembly, interior paneling, carpet replacement, headliner repair.
Maintenance:
Routine Service Intervals, Oil Changes, Filter Replacements, Tune-Ups, Fluid Checks
Repair:
Component Removal & Installation, Engine Rebuilding, Transmission Overhaul, Brake Caliper Replacement, Suspension Component Replacement
Troubleshooting:
Diagnostic Charts, Symptom-Based Troubleshooting, Electrical Fault Finding
Diagnostics:
OBD-II Procedures, Sensor Testing, ECU Code Reading
Bodywork:
Panel replacement, dent repair, rust mitigation techniques, glass replacement, trim installation.
Diagnostics OBD:
OBD-II scanner usage, reading trouble codes, clearing codes, live data interpretation.
Depth:
Comprehensive: Covers everything from basic fluid checks to full engine and transmission rebuilds.
Diagnostics Depth:
Advanced diagnostic procedures including sensor testing, circuit tracing, and ECU diagnosis.
Rebuild Depth:
Complete engine and transmission rebuild procedures with detailed component specifications and assembly sequences.
Oil Change Interval:
Every 3,000-7,500 miles (5,000-12,000 km) or 3-6 months, depending on driving conditions and oil type used.
Transmission Fluid Change Interval:
Every 30,000-60,000 miles (48,000-96,000 km)
Coolant Flush Interval:
Every 30,000 miles (48,000 km) or 2 years
Engine Oil Type:
API SG or SH, SAE 5W-30 or 10W-30 (check owner's manual for specific viscosity based on climate)
Engine Oil Capacity:
5 Quarts (4.7 Liters) with filter for 4.0L V6; 6 Quarts (5.7 Liters) with filter for 4.7L V8
Power Steering Fluid:
Mopar Power Steering Fluid or equivalent (e.g., Dexron III)
Transfer Case Fluid:
ATF+4 (for NV242, NV249); NP231 may use specific gear oil (consult manual for exact spec)
Differential Fluid Front:
API GL-5, SAE 75W-90 or 80W-90 (check axle tag for specific weight and capacity)
Differential Fluid Rear:
API GL-5, SAE 75W-90 or 80W-90 (check axle tag for specific weight and capacity)
Coolant Capacity:
Approx. 12 Quarts (11.4 Liters) for 4.0L, 13 Quarts (12.3 Liters) for 4.7L
Common Problems:
Cracked cylinder heads (especially early 4.0L), transmission cooler leaks, transfer case chain stretch, sagging headliner, front suspension bushings wear, ABS sensor failures, radiator leaks.
