How to Inspect a Used TRD Sport 4Runner: A Mechanic's Checklist

If you're shopping for a used TRD Sport 4Runner, you already know it's one of the most capable off-road SUVs still on the road. But buying used means you're inheriting someone else's maintenance history — or lack of it. Over 22 years in dealership service, I've seen plenty of 4Runners come through the bay, and the TRD Sport trim has a few unique things worth checking. I'll walk you through what to look at, what tools to bring, and when to walk away. You can do this. Here's the safe, right way.

Safety First: Pre-Inspection Prep

Before you crawl under any vehicle, take basic precautions. Park on level ground, chock the wheels, and let the engine cool if it's been running. Bring a good flashlight, a pair of gloves, and a small pry bar for checking ball joints. Also, grab a notebook. You'll want to write down any issues you find so you can negotiate the price later. The TRD Sport 4Runner is built tough, but neglect can hide serious problems.

Tool Check: What You'll Need

• Flashlight (LED preferred)
• Gloves
• Pry bar or large screwdriver (for ball joint and bushing checks)
• Tire tread depth gauge
• OBD-II scanner (I recommend a BlueDriver or similar)
• Torque wrench (if you plan to check wheel lug nuts — spec is 83 ft-lbs)
• Digital multimeter (for battery and alternator test)

Engine and Transmission Inspection

Pop the hood on the TRD Sport 4Runner and look for obvious leaks. The 4.0L 1GR-FE V6 is generally reliable, but I've seen valve cover gaskets seep around 100k miles. Check the oil dipstick — should be golden to brown, not milky or burnt. Start the engine and listen for a steady idle. A slight tick from the injectors is normal, but a knock or rattle means trouble. Shift through all gears (including 4Lo if possible) and feel for hard shifts. The A750F five-speed automatic is stout, but low fluid can cause shudder. Check the transmission dipstick (if equipped) — fluid should be pinkish-red, not brown or burnt.

Suspension and Drivetrain

The TRD Sport 4Runner comes with a sport-tuned suspension, but off-road use can wear components faster. Jack up each corner and check for play in the wheel bearings. Grab the tire at 12 and 6 o'clock and wiggle — if you feel clunk, the bearing or ball joint is loose. The front lower ball joints are a known wear item on this platform. Also, inspect the CV axle boots for tears. A torn boot lets dirt in and ruins the joint quickly. The rear suspension is a solid axle with coil springs — check the track bar and sway bar bushings for cracks. Torque specs for upper and lower control arm bolts are around 130 ft-lbs, but you're not tightening today, just inspecting.

Interior and Electronics

Inside the TRD Sport 4Runner, test every switch and button. The infotainment screen can have delamination in high heat areas. Try all windows, locks, seat heaters, and the sunroof if equipped. Check the 4WD selector: shift from 2H to 4H and back while driving straight at low speed. If it grinds or won't engage, the actuator could be failing. Also, look at the carpet around the driver's footwell for signs of water intrusion — clogged sunroof drains can cause leaks that smell musty.

Common Issues and Red Flags

Every TRD Sport 4Runner owner should know a few common problem areas. The radiator plastic tanks can crack at the seam, especially after 100k miles. Look for pink crust around the top of the radiator. The secondary air injection pump (SAI) can fail, triggering a check engine light. That's a pricey repair, but if the light is on, you want the price discounted. Also, the frame rust is a big deal on 4Runners in salt-belt states. Bring a magnet and tap along the frame rails — if the metal crumbles, walk away. Toyota did have a frame corrosion warranty extension, but it's expired for most models now.

Final Walkaround and Test Drive

Before you drive, do a full exterior inspection. Look at the tires — uneven wear on the TRD Sport 4Runner's 20-inch wheels could indicate alignment issues. Check the underbody for skid plate damage or missing bolts. Take it for a test drive on highway and back roads. Listen for clunks, vibrations, or howling from the differentials. On a straight flat road, let go of the wheel — it should track straight. The 4Runner has a truck-like feel, but if it darts or wanders, you may have worn steering rack bushings. Torque the lug nuts when you're done: 83 ft-lbs is the spec.

Verdict: Should You Buy It?

The TRD Sport 4Runner is a solid SUV if it's been maintained. The 1GR-FE engine and A750F transmission are well proven, and the sport suspension offers decent on-road handling without giving up off-road ability. But condition is everything. If you find one with full service records, no rust, and no major issues, it's a buy. If it needs a radiator, SAI pump, or ball joints, those are negotiable. And if it's rusty or has a slushy transmission, walk. You can do this. Here's the safe, right way to inspect your next TRD Sport 4Runner.