Purchasing a used Jeep WJ Grand Cherokee (1999–2004) is often the start of a rewarding ownership experience. These models built the Grand Cherokee's reputation for off-road capability and rugged, unibody design, and they remain popular with enthusiasts today. But years of use and abuse mean every used WJ deserves a careful inspection before you commit. This guide expands on the basic checkpoints, adding detailed insights into common problem areas, maintenance history, and real-world ownership quirks. By following this comprehensive walkthrough, you can separate a well-maintained Jeep from a costly project and make a confident purchase decision.

Exterior Condition

The WJ’s body panels and frame are vulnerable to corrosion, especially in regions where road salt is common. A thorough exterior inspection goes beyond superficial appearance.

Rust Inspection

Focus on these high-risk areas:

  • Rear quarter panels – rust often starts behind the wheel well flares and along the lower edge.
  • Rocker panels – check both sides for bubbling paint or holes.
  • Undercarriage – look at floor pans, frame rails (the unibody “frame”), and control arm mounts. Surface rust is acceptable, but deep rot indicates structural weakness.
  • Door bottoms and tailgate – water drains can clog, leading to internal corrosion.
  • Sunroof drains – clogged drains cause water to pool and rust the roof panel or headliner.

Paint and Body Panel Alignment

Check for mismatched paint colors on adjacent panels, overspray in door jambs, or misaligned gaps between the hood, doors, and fenders. These can signal previous accident repairs, some of which may not be reflected in a vehicle history report. Also inspect the condition of the clear coat – UV damage is common on Jeeps that lived in sunny climates, leading to peeling paint on the hood and roof.

Tires and Suspension Components

Look at tire tread depth and wear pattern. Uneven wear (feathering, cup wear) hints at poor alignment, worn ball joints, or a lifted suspension that wasn’t properly setup. Check that all four tires match in brand and size – mismatched tires on a WJ can affect 4WD engagement and damage the transfer case.

Under the Hood

The WJ came with two main engine choices: the bulletproof 4.0L inline-six (from the XJ Cherokee but improved) and the 4.7L V8, which offers more power but introduces its own set of common faults. A visual inspection under the hood reveals a lot about the previous owner’s maintenance habits.

Engine General Condition

  • Oil leaks – common on the 4.0L at the rear main seal and valve cover gasket. The 4.7L is prone to oil pan gasket, timing cover, and valve cover leaks. Puddles or fresh oil dripping indicate an active leak.
  • Coolant level and condition – green or orange? Dark or milky color could indicate head gasket issues. Also check the coolant reservoir for staining and the radiator cap seal.
  • Belts and hoses – look for cracking on serpentine belts, and squish the coolant hoses – they should be firm, not soft or bulging.
  • Battery and terminals – corrosion on terminals or a battery older than 3 years may need replacement soon.
  • Air intake and filter – a dirty filter or aftermarket cold-air intake that looks poorly installed can point to neglect or backyard modifications.

4.7L V8 Specific Concerns

The 4.7L is a modern engine for its era but has known weaknesses:

  • Cracked exhaust manifolds – listen for a ticking noise that gets louder when cold. This can also be caused by broken manifold bolts.
  • Timing chain wear – a rattling sound from the front of the engine indicates timing chain stretch or guide failure. The 4.7L uses a chain that can wear prematurely if oil changes were infrequent.
  • Water pump failure – weep holes leaking coolant or a wobbling pulley signal a failing water pump.
  • Oil sludge – if the oil filler cap has black sludge, the engine may be clogged and likely suffered extended oil change intervals.

Transmission and Transfer Case Fluids

With the engine off and cold, pull the transmission dipstick (if equipped – many WJs use a dipstick for the 4-speed 42RE/45RFE or the 5-speed 545RFE). The fluid should be red, not brown or burnt smelling. Transfer case fluid on the NV247 or NV242 should also be checked – many owners neglect these fluids. Leaks at the transmission pan gasket or transfer case output seals are common.

Interior Features

Beyond basic seat condition and electronics, the WJ interior has specific trouble spots that can be expensive to fix.

Sagging Headliner

Nearly every 20-year-old WJ has a headliner foam that separates, causing fabric to droop or fall. While reupholstering is a DIY project, many buyers use this as a bargaining point. A headliner that’s already been replaced with quality material is a plus.

Electrical Gremlins

  • Power window regulators – slow or stuck windows, especially in the rear, are common. Check each switch for smooth operation.
  • Blend door actuator – a clicking sound behind the dash when changing temperature settings means the blend door actuator is failing. This requires dash removal to replace – a costly repair.
  • Door ajar warning – if the interior dome light stays on or the “door ajar” message is always present, the door latch sensor is faulty.
  • Instrument cluster – dead pixels in the odometer/PRNDL display and intermittent operation of gauges (speedometer, fuel gauge) can be repaired but are a distraction.
  • Overhead console – the compass/temperature display often fails; check that it works.

Heating and A/C Performance

Start the engine, turn the A/C to max cold and the blower to high. Feel for cold air from the vents after a few minutes. If the system blows warm only, the compressor, refrigerant charge, or blend door is suspect. For heat, wait until the engine reaches normal temperature and switch to the hottest setting. Weak heat can indicate a clogged heater core or low coolant.

Test Drive

The test drive is your opportunity to experience the WJ’s driving dynamics and identify mechanical issues that only appear under load.

Engine and Transmission Behavior

  • Accelerate from a stop onto a highway. The transmission should shift smoothly without harshness or slipping. On the 45RFE/545RFE, the 2-3 shift is a common point of failure; a hard shift or shudder is a red flag.
  • While driving, manually downshift (if equipped with a floor shifter or the “AutoStick” feature) and verify the transmission responds without delay or jarring.
  • Listen for engine knocking, ticking, or any unusual noises that change with RPM. A steady tick under load could be an exhaust manifold leak or lifter issue on the 4.0L.

Suspension and Steering

  • Drive over a bumpy road or speed bump at low speed. Listen for clunks, creaks, or rattles from the front end – worn ball joints, control arm bushings, or sway bar links are typical culprits.
  • Death wobble – if the steering wheel shakes violently after hitting a bump at highway speeds, the WJ may have worn track bar bushings, tie rod ends, or bad steering damper. A mild shake can be caused by unbalanced tires or loose wheel bearings.
  • Steering wander – the WJ has recirculating-ball steering that can feel loose with age. A significant dead zone or constant correction suggests worn steering gear or pitman arm.
  • Brake test – from 40 mph, apply moderate pressure; the vehicle should stop straight without pulling. Warped rotors cause pedal pulsation. Look for soft or spongy pedal feel that indicates air in the system or low fluid.

4WD System Function Check

If the WJ has a Selec-Trac (NV242), Quadra-Trac II (NV247), or Quadra-Drive (with rear e-locker), test all modes if safe to do so:

  • Shift between 2WD, 4H, and 4LOW while stationary (some systems require the engine running or a slight roll). Listen for clunks or resistance.
  • With the transfer case in 4H, drive a tight circle in a parking lot. Binding or hopping indicates a malfunction (the NV247 has a viscous coupling that can lock up).
  • For Quadra-Drive, ensure the rear axle locker engages and disengages properly – it should not be engaged on dry pavement during normal driving.

Vehicle History Report

A Carfax or AutoCheck report is essential, but don’t stop there. The report covers accidents, odometer readings, and title history. Verify the following:

  • Title brand – make sure it’s “clean” or “clear.” Avoid salvage, rebuilt, or flood-damaged titles unless you are experienced and willing to accept the risks.
  • Odometer consistency – check that the mileage on the report matches what is displayed on the cluster and that there are no suspicious jumps.
  • Service records – look for regular oil changes, transmission fluid changes (every 30,000–40,000 miles), and coolant flushes. The 4.7L engine should have evidence of frequent oil changes (every 3,000–5,000 miles). If records are sparse, assume the worst.
  • Accident history – any damage reported, even minor, should be inspected. The unibody frame can be tweaked, leading to alignment issues and poor handling.

Recalls and Technical Service Bulletins (TSBs)

Recalls are safety-related and must be repaired free by the dealership regardless of ownership. The WJ has several notable recalls. Check the NHTSA recall page using the VIN. Common recalls include:

  • Ignition switch – can cause the engine to stall or fail to start.
  • Lower control arm bracket – rust perforation recall in certain regions.
  • Front suspension lower ball joint – some years were inspected for separation.

TSBs are non-safety but indicate known issues. Notable TSBs for the WJ include: transfer case pump noise (NV247), 2nd gear shudder on 45RFE transmissions, and coolant crossover tube leaks on the 4.7L. Search for TSBs on Jeep’s official site or enthusiast forums.

Pricing and Negotiation

Prices vary widely based on engine, 4WD system, mileage, condition, and location. As of the market (2023-2024), a clean, well-maintained WJ with the 4.0L and 150,000–180,000 miles typically ranges from $3,500–$6,000. A 4.7L with similar miles can be $4,000–$7,000, but the V8’s higher maintenance cost often lowers resale. Heavily modified off-road rigs can demand a premium, but only if the mods are professionally installed and include documentation.

  • Use resources like Kelley Blue Book and local market listings (Facebook Marketplace, Jeep forums) to gauge fair price.
  • Factor in deferred maintenance costs. A WJ with a shattered passenger window, sagging headliner, and failing water pump will need $1,500–$3,000 in repairs soon.
  • Be prepared to walk away if the seller is unwilling to negotiate or if red flags pile up. Don’t let enthusiasm override logic.

Common Issues and Red Flags – Detailed Look

Here is a expanded checklist of high-priority problems that a pre-purchase inspection must catch.

Engine and Cooling

  • 4.0L cracked cylinder head – some early WJ 4.0L heads (1999-2000) are prone to cracking between the valves, causing misfires and coolant loss. Check for white smoke from exhaust or sweet coolant smell.
  • 4.7L head gasket failure – occurs most often after high mileage and overheating events. Look for oil in coolant, coolant in oil, or bubbles in the overflow tank.
  • Radiator failure – the plastic tank radiators on the WJ crack at the inlet/outlet. A new radiator is cheap, but an overheated engine is not.
  • Fan clutch not engaging – the mechanical fan should roar when the engine is hot and then stop spinning freely within a couple of seconds when turned off.

Transmission and Drivetrain

  • Transmission 2-ND shift shudder (45RFE/545RFE) – a well-known problem. If the fluid is old but shift is smooth, a fluid change might help. If it already shudders, the transmission may need a rebuild soon.
  • Transfer case chain slip (NV247) – a clunking noise when accelerating from a stop or cornering. The chain inside the transfer case stretches and can break.
  • Rear pinion seal leaks – common on Dana 35 or 44 axles. Oil dripping on the exhaust creates smell and can lead to gear failure.

Electrical and Accessories

  • Central timer module (CTM) failure – causes weird issues like intermittent wipers, dome light problems, or door locks acting erratically.
  • Fuel gauge inaccuracy – the fuel sending unit in the tank often fails, leading to a gauge that reads full for the first 100 miles then drops rapidly.
  • ABS sensors – if the ABS light is on, sensors at each wheel may be covered in rust or failed. Replacement is straightforward but adds cost.

Off-Road Modifications – Proceed with Caution

Many WJ Grand Cherokees are lifted, locked, and loaded for serious off-roading. A modified Jeep can be a great buy if the work was done right. Check these points:

  • Lift kit quality – cheap spacers or budget lifts often leave the ride harsh. Quality kits (e.g., Rubicon Express, Old Man Emu, IRO) usually offer a good balance.
  • Driveline angles – look for a transfer case drop or aftermarket CV driveshaft. Without proper adjustment, the rear U-joint will vibrate at highway speeds.
  • Steering upgrades – a lifted WJ needs upgraded track bar, control arms, and steering linkage. Inspect for excessive play or misalignment.
  • Tire size and gearing – if the owner installed large tires (33” or 35”) without regearing, the 4.0L or 4.7L will struggle with acceleration and fuel economy. Ask about gear ratio changes.
  • Wiring for lights and accessories – sloppy tap jobs can cause electrical fires. Look for unused wires, duct-taped connections, or added fuse boxes that are not securely mounted.

Maintenance Schedule and Documentation

A well-maintained WJ will have service records or at least receipts. Key recommended intervals:

  • Oil change – every 3,000–5,000 miles for 4.0L; every 3,000–4,000 miles for 4.7L (synthetic recommended).
  • Transmission fluid and filter – every 30,000–40,000 miles.
  • Transfer case fluid – every 30,000–60,000 miles.
  • Coolant flush – every 2 years or 30,000 miles.
  • Spark plugs – copper plugs every 30,000 miles, platinum every 60,000 miles.
  • Timing chain (4.7L) – inspect at 100,000 miles; replacement is not scheduled but common after 120,000–150,000 miles.
  • Water pump – every 60,000–80,000 miles as preventative.

Final Thoughts

Buying a used Jeep WJ Grand Cherokee is a process that rewards patience and preparation. The chassis is robust, the aftermarket support is massive, and the community knowledge is deep. But skipping inspections can land you with a vehicle that needs thousands in repairs within the first year. Take the time to check the exterior for rust, look under the hood for leaks, test every interior function, drive on multiple road surfaces, verify the 4WD system, pull a vehicle history report, and (if possible) have a mechanic perform a pre-purchase inspection. By doing so, you’ll find a WJ that can run reliably for another decade and take you to places only a Jeep can reach.