Rust — The Big One
Floor PansCheck under all carpet, especially driver's side and behind rear seat. Soft spots = rust-through. Cost to repair: $500–2,000+
Rocker PanelsLook under the side trim. Rocker rust on FJ60/62 is extremely common and expensive to repair properly.
FrameSurface rust is cosmetic. Scale rust (flaking layers) compromises structural integrity. Use a screwdriver — if it pokes through, walk away.
Tailgate & Rear CornersCommon rust areas. Mostly cosmetic but expensive to repair.
Windshield Frame & A-PillarsRust here is serious and expensive.
Engine Issues
Blue SmokeBurning oil. Could be valve seals (common, fixable ~$500), could be rings (expensive, $2,000+). Don't ignore it.
White Smoke When WarmCoolant in combustion. Head gasket suspect. Walk away or budget $1,500–3,000.
3F-E Rough Idle / Stumble (FJ62)Could be AFM, TPS, injectors, vacuum leaks. Diagnosable but budget $300–800.
Overheating HistoryOverheated 3F/3F-E engines can have warped heads. Ask directly. A truck that "ran a little hot once" may have hidden damage.
Unknown Timing Belt History (FJ62)If the seller doesn't know when the belt was last done, assume it needs doing. Broken timing belt = bent valves = engine rebuild.
Drivetrain
Auto Transmission SlippingHesitation between gears, RPM flare without acceleration = worn transmission. Budget $1,500–3,000 for rebuild.
Transfer Case Noise in 4WDGrinding or whining suggests worn internals.
Clunking in Front EndCould be worn birfield joints (~$400–600 to rebuild), worn wheel bearings, or worn U-joints.
Differential LeaksLeaking diff covers usually just need a new gasket. But leaking axle seals mean bearings may be running dry.
Electrical
Non-Functional Gauge ClusterFJ60/62 clusters are known to develop issues. Full cluster failure is annoying but manageable.
Patchy WiringLook for wire splices, replaced switches, non-factory wiring under the dash. Ask what was done and why.
Aftermarket Stereo — Messy InstallOften indicates cutting of the original wiring harness.
Body
Previously Wrecked & RepairedLook for overspray, mismatched paint, gaps in body panels. A well-repaired truck is okay. A poorly repaired truck hides more problems.
Lifted with Unknown PartsA lift installed by a previous owner may be quality work or may be dangerous. Ask what was done and by whom.
"Needs Work" Without SpecificsPress for details. Every truck needs something — a seller who can't articulate what is either uninformed or hiding something.