1998 JEEP GRAND CHEROKEE

Typical onset: 90,000-140,000 mi

Symptoms: Strawberry-milkshake fluid in radiator overflow or transmission pan, Delayed or erratic shifts, slipping, Transmission overheat warnings or burnt ATF smell

Fix: The internal cooler in the radiator fails, mixing coolant and ATF; coolant gets pumped into the transmission and destroys clutch packs and valve body. Requires radiator replacement with external cooler add-on, complete transmission flush or rebuild, and often torque converter replacement. 8-12 hours if rebuild needed.

Estimated cost: $1,800-3,500

Typical onset: 120,000-180,000 mi

Symptoms: Coolant loss with no external leaks, white smoke from exhaust, Overheating, especially after sitting overnight, Bubbling in coolant reservoir, rough idle when cold

Fix: The 0331-cast cylinder head (1999-2001 but sometimes appearing in late '98 builds) cracks between cylinders 3 and 4; earlier heads just blow head gaskets. Requires head removal, replacement or machining, and gasket kit. Also common to find warped head. 10-14 hours labor.

Estimated cost: $1,200-2,200

Typical onset: 80,000-130,000 mi

Symptoms: Violent shaking of entire front end at highway speeds, especially after hitting bump, Clunking or looseness felt in steering wheel, Uneven tire wear on front axle

Fix: Track bar bushings, ball joints, tie rod ends, and steering damper all wear; any slop triggers harmonic oscillation in the solid front axle. Requires systematic replacement of all loose components—track bar, drag link, tie rods, ball joints, damper—plus alignment. 4-6 hours.

Estimated cost: $800-1,400

Typical onset: 100,000-150,000 mi

Symptoms: No-start condition, cranks but won't fire, Stalling or hesitation under load, especially uphill, Whining or buzzing noise from rear before failure

Fix: In-tank pump fails from age and sediment; steel tanks rust internally in humid climates. Requires tank drop, pump module replacement, and often tank replacement if corroded. 3-4 hours labor.

Estimated cost: $500-900

Typical onset: 120,000+ mi

Symptoms: Oil pooling under bellhousing area or dripping from oil pan, Low oil level between changes, no visible upper-engine leaks, Oil-soaked starter or transmission dust shield

Fix: The 4.0L develops rear main seal leaks and oil pan gasket seepage; often both at once. Rear main requires transmission removal. 6-8 hours for rear main, 2-3 for pan gasket alone.

Estimated cost: $600-1,200

Typical onset: 100,000+ mi

Symptoms: Hard brake pedal, increased effort required to stop, Hissing sound under dash when braking, Engine stalling or rough idle when braking

Fix: Check valve fails or diaphragm in booster tears, losing vacuum assist. Replace check valve first ($20 part, 0.5 hours); if booster itself is leaking, replacement is 2-3 hours.

Estimated cost: $150-500

Typical onset: 90,000+ mi

Symptoms: Shifter feels loose or sloppy, doesn't engage Park reliably, Indicator doesn't match actual gear position, Key won't release from ignition, transmission doesn't match PRNDL

Fix: Plastic bushings in shift linkage deteriorate; column shifter cable stretches or frays. Replace bushings and adjust linkage; column shifter cable replacement if binding. 1-2 hours.

Estimated cost: $150-350