1997 FORD EXPLORER

Typical onset: 80,000-140,000 mi

Symptoms: Harsh 2-3 shift or slipping between gears under load, No forward movement but reverse works (forward clutch pack failure), Delayed engagement when shifting into drive, especially when cold, Transmission fluid in the cooling system or coolant in the trans (cooler leak in radiator)

Fix: Internal clutch pack wear is terminal — requires rebuild or replacement. The radiator-integrated transmission cooler commonly leaks, mixing coolant and ATF which destroys the trans within days if not caught. Rebuild takes 8-12 hours; many opt for reman unit at 6-8 hours labor plus core charge.

Estimated cost: $1,800-3,200

Typical onset: 100,000-180,000 mi

Symptoms: Rattling on cold start that goes away after 10-15 seconds, Check engine light with cam/crank correlation codes (P0340, P0345), Sudden loss of power or no-start if chains jump time, Metal shavings in oil from guide wear

Fix: The SOHC uses plastic-backed timing chain cassettes and tensioners that fail catastrophically. Requires removal of front engine cover, both heads often come off for access. Job runs 14-18 hours because it's tight and everything breaks. Do water pump, thermostat, and all gaskets while in there. OHV version doesn't have this issue.

Estimated cost: $2,500-4,500

Typical onset: 90,000-150,000 mi

Symptoms: Clunking over bumps from front suspension, Steering wander or shimmy at highway speeds, Visible grease leaking from ball joint boot, Catastrophic failure drops wheel outward causing loss of control

Fix: Ford used a pressed-in lower ball joint design that wears and can separate without warning — this was subject to recalls but many weren't fixed. Requires entire lower control arm replacement per side at 2-3 hours labor each. Alignment mandatory after. Do both sides and inspect uppers.

Estimated cost: $600-1,000

Typical onset: 70,000-120,000 mi

Symptoms: Coolant smell from engine bay, especially after shutdown, White smoke on cold start that clears quickly, Overheating or coolant loss with no visible external leaks, Rough idle or misfire from coolant entering cylinders

Fix: The OHV 4.0L has a plastic intake manifold that warps, leaking coolant at the gasket surface. Replacement requires upper manifold removal at 4-6 hours. Use OEM gaskets — aftermarket fail quickly. SOHC doesn't suffer this specific failure as severely.

Estimated cost: $600-900

Typical onset: 80,000-140,000 mi

Symptoms: Gear oil dripping from front of rear differential, Oil coating on driveshaft and undercarriage behind axle, Whining noise from rear end if fluid level drops significantly

Fix: The 8.8-inch rear axle pinion seal leaks from age and mileage. Driveshaft removal and seal replacement is straightforward at 1.5-2 hours, but preload must be checked. Some mechanics install slightly oversized aftermarket seals for worn pinion surfaces.

Estimated cost: $250-450

Typical onset: 100,000-160,000 mi

Symptoms: No-start with cranking but no fuel pressure, Intermittent stalling when hot or at low fuel level, Whining noise from fuel tank area before complete failure, Hesitation or stumbling under acceleration

Fix: In-tank pump assembly fails from age and contamination. Tank must be dropped for access, 2-3 hours labor. Replace fuel filter at same time — it's inline under driver's side frame rail. Use quality pump (Motorcraft or equivalent), not economy brands.

Estimated cost: $500-800

Symptoms: Rear glass won't open or close electrically, Broken hinge visible at bottom corners of glass, Glass sits crooked or loose in frame, Water leaks into cargo area after hinge cracks

Fix: The rear liftglass hinges are plastic and crack from UV exposure and load cycling. Replacement requires glass removal and patience — 2-3 hours labor. Aftermarket hinges available but OEM lasts longer. Very common failure that's more annoyance than safety issue.

Estimated cost: $300-500