2002 JEEP GRAND CHEROKEE

4.7L V84WDAUTOMATICgas
5-Year Cost of Ownership
$15,045 maintenance + known platform issues
~$3,009/yr · 250¢/mile equivalent · $5,470 maintenance + $8,875 expected platform issues
Compare this engine
vs
3.6L V6 Pentastar
vs
5.7L V8 Hemi
Common Problems & Known Issues

The 2002 Grand Cherokee WJ is mechanically stout but notorious for catastrophic transmission failures and 4.7L V8 head/bottom-end issues. When maintained religiously, the 4.0L I6 versions can exceed 200k miles, but neglect turns these into money pits fast.

45RFE/545RFE Transmission Failure with Cooler Contamination

Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Harsh 2-3 shift or slipping in 3rd/4th gear under load, Transmission fluid milky/pink from coolant cross-contamination, Delayed engagement when cold, then complete loss of forward gears, Metal shavings in pan during routine service
Fix: Cooler lines crack or internal radiator trans cooler fails, pumping coolant into trans and destroying clutch packs. Requires transmission rebuild or replacement plus external cooler install, radiator replacement if internal cooler failed, and full fluid system flush. 12-16 labor hours for trans R&R and rebuild.
Estimated cost: $2,800-4,200

4.7L V8 Cylinder Head Cracking and Valve Seat Failure

Occasional · high severity
Typical onset: 100,000-160,000 mi
Symptoms: Coolant loss with no visible leaks, white smoke at startup, Misfires on specific cylinders (usually 6 or 8) that don't clear with plug/coil swaps, Overheating episodes followed by rough idle, Bubbles in coolant reservoir when engine running
Fix: Early PowerTech heads prone to cracking between valve seats, especially rear cylinders. Requires both head gaskets, machining or replacement heads, timing components, and complete cooling system refresh. 18-22 labor hours. Many shops recommend shortblock if bearings show wear during teardown.
Estimated cost: $3,500-5,800

4.7L V8 Piston Slap and Rod Bearing Wear

Occasional · high severity
Typical onset: 120,000-180,000 mi
Symptoms: Cold-start piston slap that lasts 30-60 seconds (distinct hollow knock), Low oil pressure at hot idle below 20psi, Rod knock on acceleration after engine fully warmed, Metal glitter or chunks in oil filter during changes
Fix: Inadequate piston-to-wall clearance from factory and thin bearing design leads to premature wear. Piston slap alone can persist 50k+ miles, but rod bearing failure is sudden. Full rebuild with oversized pistons and upgraded bearings, or shortblock replacement. 20-26 labor hours.
Estimated cost: $4,200-6,500

4.0L I6 Cylinder Head Cracking (0331 Casting)

Common · high severity
Typical onset: 90,000-150,000 mi
Symptoms: External coolant leak at back of head near firewall, Overheating with no visible radiator/hose leaks, Coolant smell in cabin, fogged windows, Cylinder 5 or 6 misfire with coolant in spark plug well
Fix: The 0331 casting (built 1999-2001, used through early 2002) cracks between cylinders 3-4 or near the coolant passages. Requires Tupy/newer 0331 replacement head or upgraded aftermarket casting, machining, and timing set. 10-13 labor hours. Verify casting number before purchase—Tupy castings rarely fail.
Estimated cost: $1,800-2,800

Front Lower Control Arm Bushing Failure

Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander and vague on-center feel, especially highway, Uneven inner tire wear on front tires, Visible torn rubber bushings at lower control arm pivot points
Fix: Factory rubber bushings deteriorate, causing alignment shift and poor handling. Replacement requires full lower control arms (bushings aren't serviceable separately in most shops). Alignment mandatory after. 3-4 labor hours both sides with alignment.
Estimated cost: $650-950

Transfer Case Chain Stretch and Viscous Coupler Failure (Quadra-Trac II)

Occasional · medium severity
Typical onset: 120,000-170,000 mi
Symptoms: Grinding or rattling from under vehicle during acceleration, Binding or jerking in tight turns on dry pavement, Service 4WD warning light intermittent or constant, Vibration at highway speeds that worsens under load
Fix: NV247 transfer case chain stretches, and viscous coupler lockup causes binding. Requires case disassembly, chain and coupler replacement, and new fluid. Many shops recommend reman unit swap for labor efficiency. 6-8 hours for rebuild, 4-5 for swap.
Estimated cost: $1,400-2,200

Fuel Pump and Sending Unit Failure

Common · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Stalling or no-start when fuel tank below 1/4, Fuel gauge reading erratic or stuck at empty/full, Whining noise from rear during acceleration, Engine dies after 10-15 minutes running, restarts when cool
Fix: Fuel pump assembly fails from age and ethanol fuel degradation. Entire pump module with sending unit typically replaced as assembly. Tank drop required. 2.5-3 labor hours.
Estimated cost: $550-850
Owner tips
  • Change transmission fluid every 30k miles with Mopar ATF+4 ONLY—aftermarket fluids accelerate failure
  • Install an auxiliary transmission cooler immediately if towing or in hot climates
  • On 4.7L V8s, replace coolant every 2 years and verify thermostat operation—overheating episodes trigger head failures
  • For 4.0L I6, check cylinder head casting number (0331 vs Tupy)—walk away from 0331 unless already replaced
  • Inspect transmission cooler lines at radiator annually for cracks—$40 in lines prevents a $4k trans replacement
Buy a 4.0L I6 with Tupy head and service records; avoid 4.7L V8 unless you're comfortable with major engine work or budget $5k for preventive rebuild.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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