1990 FORD RANGER

Typical onset: 80,000-140,000 mi

Symptoms: Slipping between 2nd and 3rd gear, especially under load, Delayed or harsh engagement when shifting into drive, Burning smell from transmission fluid, dark or metallic-flecked fluid, Complete loss of forward gears while reverse still works

Fix: The A4LD four-speed automatic is notorious for worn clutch packs, failed solenoids, and valve body issues. Rebuild requires 8-12 hours including R&R. Many shops recommend replacement with remanufactured unit (6-8 hours swap time) over rebuild due to parts availability and labor overlap. Cooler line failure accelerates death—check for external leaks religiously.

Estimated cost: $1,800-3,200

Typical onset: 90,000-150,000 mi

Symptoms: White smoke from exhaust on cold starts, Coolant consumption without visible external leaks, Oil milkshake appearance on dipstick or in coolant overflow, Rough idle and misfires, especially after sitting overnight

Fix: The 2.9L Cologne V6 has thin deck surfaces that warp easily with overheating. Both heads typically need machining (0.010-0.020 removal common). Budget 14-18 hours for both gaskets including head R&R, machining downtime, and valve job if guides are worn. The 4.0L OHV rarely has this issue—it's specifically a 2.9L problem tied to casting thickness.

Estimated cost: $1,400-2,400

Typical onset: 70,000-120,000 mi

Symptoms: Intermittent stalling or no-start when fuel tank below 1/4 tank, Fuel gauge reads empty regardless of actual fuel level, Engine sputtering or loss of power under acceleration, Whining noise from fuel tank area during operation

Fix: In-tank electric fuel pumps fail from heat and contamination, while the integrated sending unit float arms corrode or break at pivot points. Requires tank drop (2.5-3.5 hours). Always replace strainer sock and check rubber filler neck for cracks while tank is down. Aftermarket pumps acceptable but OE-style assemblies have better longevity in ethanol fuel.

Estimated cost: $400-750

Symptoms: Transmission fluid drips or puddles under front of truck, Transmission running hotter than normal (if equipped with temp gauge), Low transmission fluid level on dipstick with no visible pan leak, Rust stains along frame rail below radiator area

Fix: Steel cooler lines rust through at frame contact points and rubber flex section couplings deteriorate, particularly in salt-belt regions. Lines run from transmission to radiator-mounted cooler. Replacement is straightforward (1.5-2 hours) but flare fittings can break if corroded—sometimes requires radiator removal for access. Use pre-bent replacement sets or custom brake line if unavailable. Flush cooler at same time.

Estimated cost: $250-500

Typical onset: 100,000+ mi

Symptoms: Intermittent stalling at idle or when coming to stop, Surging or hunting idle (500-1200 RPM fluctuation), Hesitation off idle followed by sudden acceleration, Check engine light with codes 23 or 53 (TPS circuit)

Fix: Carbon buildup on TPS wiper contacts causes voltage spikes. The EEC-IV system on these Rangers is sensitive to TPS input for fuel delivery. Sensor is mounted on throttle body (0.5 hour replacement). Clean throttle bore and IAC passages at same time—dirty throttle plates cause similar symptoms and misdiagnosis. Test TPS with voltmeter sweep before replacing; many are incorrectly diagnosed.

Estimated cost: $120-280

Typical onset: 80,000-130,000 mi

Symptoms: Clutch pedal goes to floor with no resistance, Difficulty shifting into gear with engine running, Visible brake fluid leak at firewall or bellhousing, Pedal feels spongy or requires pumping to build pressure

Fix: Hydraulic clutch system uses shared brake fluid reservoir. Master cylinder (2 hours) fails internally; slave cylinder (1.5 hours, requires transmission removal or accessed from underneath) leaks externally. Internal slave cylinder on some models requires trans drop—external style is serviceable without. Bleed system thoroughly; air pockets cause repeat comebacks. Replace both if one fails—they age together.

Estimated cost: $350-700