1999 JEEP GRAND CHEROKEE

4.0L I64WDAUTOMATICgas
5-Year Cost of Ownership
$38,105 maintenance + known platform issues
~$7,621/yr · 640¢/mile equivalent · $31,743 maintenance + $5,662 expected platform issues
Compare this engine
vs
3.6L V6 Pentastar
vs
5.7L V8 Hemi
Common Problems & Known Issues

The 1999 Grand Cherokee WJ is a capable SUV plagued by transmission cooling failures and 4.0L head cracking issues. The 4.7L V8 is more robust but transmission problems affect both engines equally.

Transmission Oil Cooler Line Failure & Transmission Death

Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Pink/milky fluid in radiator or transmission pan, Transmission slipping or delayed engagement, Sudden complete transmission failure after overheating, Coolant or ATF cross-contamination
Fix: The factory cooler lines corrode and rupture, mixing coolant into transmission fluid. This kills the 45RFE/545RFE transmission within days if not caught. Requires cooler line replacement ($300-600), often WITH transmission rebuild ($2,000-3,500) if contamination occurred. Add 12-18 hours labor for full transmission R&R. Preventive external cooler install is 2 hours.
Estimated cost: $2,300-4,100

4.0L PowerTech I6 Head Gasket & Cracking (0331 Casting)

Common · high severity
Typical onset: 100,000-180,000 mi
Symptoms: Overheating with no external leaks, Coolant loss into cylinders (white smoke), Rough idle when cold, smooths when warm, Cylinder 3/6 misfire codes after heat cycling
Fix: The infamous 0331 cylinder head casting cracks between cylinders 3-4. Not just gaskets—the head itself fails. Requires replacement head (not rebuilding cracked one), machining, and full gasket set. 10-14 hours labor. Upgrade to Tupy 0331 casting or later 0331J when available. Some shops do full top-end refreshes at this point.
Estimated cost: $1,800-3,200

Transfer Case Mode Select Issues (Shift Motor Encoder)

Common · medium severity
Typical onset: 70,000-130,000 mi
Symptoms: Service 4WD light illuminated, Transfer case stuck in 4WD or won't engage 4WD, Grinding/clicking from transfer case area when shifting, Part-time 4WD won't disengage on dry pavement
Fix: The NV247/NP242 shift motor encoder fails or the mode sensor goes bad. Sometimes just motor replacement (1.5 hours), sometimes requires full transfer case disassembly for internal mode fork issues (6-8 hours). Fluid contamination accelerates this. Many replace shift motor first ($150 part, 1.5 hr labor) then reassess.
Estimated cost: $300-1,400

Death Wobble (Track Bar & Steering Components)

Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Violent steering wheel oscillation at 45-55 mph, Wobble triggered by bumps or road imperfections, Loose steering feel over center, Clunking from front end over bumps
Fix: Death wobble is NOT one part—it's worn track bar bushings PLUS tie rod ends PLUS ball joints creating a feedback loop. Track bar bolt holes wallowing out in frame is common. Requires track bar ($120-250), tie rod ends ($80-150 pair), often ball joints ($200-400), and possible frame welding/reinforcement plates. Plan 4-6 hours for full front-end overhaul. Some add steering stabilizer as bandaid—doesn't fix root cause.
Estimated cost: $600-1,500

Blower Motor Resistor & Final Stage Unit Failure

Common · low severity
Symptoms: HVAC blower only works on high speed, No blower function at all, Intermittent blower operation, Blower speeds 1-3 dead, only 4 works
Fix: The blower motor resistor (manual climate) or final stage unit (auto climate) burns out. Located under passenger dash. DIY-friendly: 30 minutes with basic tools. Resistor is $25-60 part, final stage unit $80-150. Shops charge 0.5-1.0 hour. Often caused by clogged cabin filter (which this gen doesn't have factory) or failing blower motor drawing too much current.
Estimated cost: $100-250

Fuel Pump Failure (In-Tank)

Occasional · high severity
Typical onset: 90,000-160,000 mi
Symptoms: No-start with crank but no fuel pressure, Stalling when fuel tank below 1/4 full, Hesitation or cutting out at highway speed, Whining noise from fuel tank area
Fix: Chrysler fuel pumps of this era are mediocre. Requires tank drop (2.5-3.5 hours labor). Pump assembly runs $150-350 depending on OEM vs aftermarket. Running tank near-empty repeatedly kills pumps early. Always replace fuel filter during pump R&R (it's often original and restricting flow).
Estimated cost: $400-750

Rear Upper Control Arm Bushing Failure (Jeep Wiggle)

Common · medium severity
Typical onset: 80,000-140,000 mi
Symptoms: Rear-end hopping or bouncing over bumps, Steering wheel off-center after driving, Tire scrubbing noise on tight turns, Excessive rear tire wear on inner edges
Fix: The rear upper control arm bushings disintegrate, causing the axle to shift side-to-side (the 'Jeep wiggle'). Requires upper control arms or bushing replacement. 2-3 hours labor plus alignment (1 hour). Arms are $120-250 pair. Some opt for adjustable aftermarket arms for better alignment control. Alignment is CRITICAL after—many shops skip it and customer returns with weird tire wear.
Estimated cost: $450-800
Owner tips
  • Install an external transmission cooler immediately on any used purchase—cheap insurance against the $3k transmission killer
  • If buying a 4.0L, verify head casting number (0331 vs tupy 0331 vs later) and walk if engine has overheated repeatedly
  • Budget $800-1200 for front-end rebuild on any high-mileage example—death wobble WILL appear if not already done
  • Check transfer case fluid every 30k miles and use ATF+4 only—saves the mode encoder from premature death
Buy the 4.7L V8 if possible, add an external trans cooler day one, and keep $2,000 set aside for inevitable front-end and transmission work—solid SUV if maintained but not for the unprepared.
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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