The 1995 Explorer with 4.0L OHV V6 is a workhorse that'll run forever if you catch the transmission cooler leak early. Miss it, and you're rebuilding both the trans and engine — this is the platform's Achilles heel.
Transmission Oil Cooler Failure Leading to Catastrophic Engine/Trans Damage
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Milky/strawberry-colored transmission fluid or coolant, Trans slipping or delayed engagement after coolant system work, Overheating transmission, White smoke from exhaust and catastrophic engine failure if coolant enters transmission then gets pumped into engine
Fix: The internal trans cooler in the radiator fails, allowing coolant and ATF to mix. Coolant destroys clutch packs; ATF in coolant can circulate into the engine via heater core backflow, wiping bearings. Caught early: external trans cooler install and fluid flush, 3-4 hours. Caught late: transmission rebuild (12-16 hours) plus engine rebuild if coolant contaminated cylinders (25-35 hours). Always bypass the radiator cooler and install external cooler as preventive measure.
Estimated cost: $400-800 if caught early; $4,500-8,000+ for trans and engine rebuild
4.0L OHV Lower Engine Failure (Rod/Main Bearings, Piston Rings)
Common · high severityTypical onset: 120,000-180,000 mi
Symptoms: Rod knock on cold start that quiets when warm, or constant knocking, Excessive oil consumption (1 qt per 500-800 miles), Blue smoke on startup or under load, Low oil pressure at idle when hot, Metal flakes in oil or filter
Fix: This OHV 4.0L has marginal oiling to the #3 and #4 rod bearings; combine with owners who skip oil changes and you get spun bearings or scored cylinder walls. Rings fail from heat cycling. Short block replacement is most common fix (18-24 hours), though full rebuilds with bore/hone run 28-35 hours. Used engines are plentiful but gamble on their history.
Estimated cost: $3,200-5,500 for shop-installed short block; $4,500-7,000 for full rebuild
A4LD/4R55E Transmission Failures
Common · high severityTypical onset: 100,000-150,000 mi
Symptoms: Harsh 1-2 or 2-3 shifts, or no upshift past 2nd gear, Slipping in 3rd or 4th gear under load, No reverse or delayed reverse engagement, Burnt ATF smell, dark red or brown fluid
Fix: The A4LD (early '95s) and 4R55E are weak transmissions behind the torquey 4.0L, especially if used for towing. Overdrive band adjusters strip, valve bodies clog, and clutch packs burn. Rebuild is 12-16 hours; many shops won't touch A4LD anymore and recommend 4R55E swap. External cooler is mandatory on any rebuilt trans.
Estimated cost: $1,800-3,200 for rebuild; $2,200-3,800 for reman swap with cooler
Ball Joint and Tie Rod End Wear
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: Clunking over bumps from front suspension, Wandering or loose steering feel, Uneven or cupped tire wear on inside edges, Visible play in wheel when jacked up and rocked
Fix: The Twin Traction Beam front end eats ball joints and tie rod ends, especially if driven on rough roads or with oversized tires. Lower ball joints are press-in (2.5 hours per side), uppers bolt on (1.5 hours per side). Tie rod ends are 1 hour each. NHTSA recalled tie rods on some units; most are worn by now anyway. Do alignment after any front-end work.
Estimated cost: $800-1,400 for all four ball joints; $180-320 for both inner and outer tie rods per side
Rear Liftgate Support Strut Failure
Common · low severitySymptoms: Liftgate drops suddenly when opened, risk of head injury, Liftgate won't stay open without propping
Fix: Gas struts lose pressure over time and with heat cycling. NHTSA recalled these for safety. Replacement is 0.3 hours, always do both sides. Cheap insurance against a concussion.
Estimated cost: $80-150 for pair installed
Fuel Pump Failure
Occasional · medium severityTypical onset: 100,000-160,000 mi
Symptoms: No-start with whirring/buzzing from tank but no fuel pressure, Intermittent stalling when fuel level below 1/4 tank, Loss of power under acceleration or at highway speed, Long crank time before engine catches
Fix: In-tank pump wears out, especially if owners run tank low frequently. Requires dropping tank (1.5-2 hours), replacing pump assembly, and dropping tank means inspecting and often replacing rusty straps and filler neck. Fuel filter should've been changed every 30k but rarely was — clogged filter kills pumps early.
Estimated cost: $450-750 including pump assembly and labor
Intake Manifold Gasket Leaks (Vacuum and Coolant)
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Rough idle, high idle, or stalling, Coolant seepage at front or rear of intake manifold, CEL with lean codes (P0171/P0174) from vacuum leak, Sweet coolant smell in cabin or under hood
Fix: The lower intake plenum gaskets dry out and crack, causing vacuum leaks; coolant crossover gaskets at the front/rear leak externally. Job requires removing upper and lower intake (5-7 hours). Often find corroded throttle body and vacuum tree hoses while you're in there. Don't cheap out on gasket set — use Fel-Pro or OEM.
Estimated cost: $650-1,100 including gaskets and coolant
Buy one under 100k miles with service records showing religious oil changes and proof of external trans cooler install; skip any with unknown history or over 120k — you're buying someone else's deferred overhaul.
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.