Engine Mechanical:
Complete disassembly, inspection, repair, and reassembly of 2.5L I4 and 4.0L I6 engines, including cylinder head, block, pistons, crankshaft, camshaft, timing system, lubrication system, cooling system.
Engine Fuel System:
Fuel injection systems (MPI), fuel pump, fuel filter, fuel pressure regulator, injectors, throttle body, ECU controls.
Engine Ignition System:
Spark plugs, ignition coils, distributor (early models), distributorless ignition system (DIS) (later models), timing adjustments, ECU controls.
Transmission Manual:
NV1500, NV3500 manual transmissions: Clutch, gearbox, shifter mechanisms, maintenance, repair, overhaul.
Transmission Automatic:
AW4 (AS4.1) automatic transmission: Torque converter, valve body, planetary gearsets, seals, fluid services, electronic controls, troubleshooting.
Drivetrain:
Transfer case (NP231, NP242): Operation, maintenance, seals, bearings, chain tension, repair. Front and rear axles (Dana 30, Dana 35C): Differential service, axle shafts, bearings, seals, U-joints, CV joints (if applicable).
Suspension:
Front and rear suspension: Leaf springs (rear), coil springs (front), shock absorbers, bushings, control arms, sway bars, alignment specifications.
Steering:
Power steering system: Pump, reservoir, lines, steering gear/rack and pinion, tie rods, maintenance, troubleshooting.
Brakes:
Front disc brakes, rear drum brakes (standard), optional rear disc brakes: Master cylinder, brake lines, calipers, rotors, pads, drums, shoes, parking brake system, ABS (where applicable), bleeding procedures.
Electrical System:
Battery, charging system (alternator), starting system (starter), fuse box, relays, wiring diagrams for all major circuits (engine control, lighting, instruments, power accessories, etc.).
HVAC:
Air conditioning system: Compressor, condenser, evaporator, refrigerant, blower motor, controls. Heater core, ducting, operation, maintenance.
Body And Frame:
Body panel removal/installation, doors, hood, tailgate, bumpers, interior trim, chassis lubrication, rust prevention.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, tune-ups, belt and hose replacement, brake fluid flush, coolant flush.
Diagnostics:
Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based troubleshooting for all major systems, electrical diagnostic procedures.
Repair:
Step-by-step repair instructions for all major mechanical, electrical, and body components. Engine rebuild procedures, transmission overhaul, brake caliper replacement, suspension component replacement, etc.
Disassembly Reassembly:
Detailed instructions for component removal and installation with torque specifications.
Wiring Diagrams:
Comprehensive, system-specific wiring diagrams for all model years and major electrical systems.
Depth:
Factory-level detail for all aspects of vehicle maintenance, repair, and diagnostics. Suitable for professional mechanics and advanced DIY enthusiasts.
Oil Change Interval:
Every 3,000-5,000 miles or 6 months, whichever comes first (conventional oil). Consult manual for synthetic oil recommendations.
Transmission Fluid Change:
Automatic: Every 30,000-60,000 miles. Manual: Inspect regularly, change if fluid appears contaminated or degraded.
Coolant Flush:
Every 30,000-50,000 miles or 2-3 years.
Spark Plug Replacement:
2.5L: Approx. 30,000 miles. 4.0L: Approx. 30,000-60,000 miles (depending on plug type).
Engine Oil:
10W-30 or 10W-40 (check owner's manual for specific ambient temperature ranges). API Service SJ or higher.
Coolant:
Ethylene Glycol based antifreeze, 50/50 mixture with distilled water. Mopar OAT or HOAT coolant recommended for later models.
Brake Fluid:
DOT 3 or DOT 4 (check specific year).
Power Steering Fluid:
ATF+3 or Mopar Power Steering Fluid.
Engine Cooling:
Radiator leaks, heater core failures, thermostat housing leaks are common. Overheating can lead to head gasket issues on the 4.0L.
Electrical:
Aging wiring harnesses, failing sensors (e.g., CPS, TPS), blower motor resistor failures, interior electrical gremlins.
Suspension Steering:
Worn control arm bushings, ball joints, tie rod ends, and sway bar links due to age and off-road use. Steering box wear/play.
Drivetrain:
Transfer case chain stretch, differential pinion seal leaks, rear axle bearing wear on Dana 35.
Body Rust:
Common rust points include rocker panels, rear quarter panels, tailgate, and floor pans, especially in areas with road salt.