Checks, in order
- Fluid levelRemove the fill plug with the truck level. Fluid should be at the bottom of the opening. Low fluid often comes with a leak at the pinion or axle seals.easy $ · under about $50
- Change the gear oilDrain and refill with the gear oil specified for your axle in the factory manual. Check the drain plug magnet for fuzz or metal chunks.medium $ · under about $50
- Note when it makes noiseWhine on acceleration, coast or at one speed range helps separate a worn pinion bearing from a ring and pinion or axle bearing.easy $ · under about $50
- Pinion seal and axle sealsLook for oil on the pinion flange, the back of the axle shafts and the inside of the wheel. A leaking seal is a repair that does not require new gears.medium $$ · about $50 to $500
- Bearing or gear setIf noise persists after fresh fluid, a shop can measure backlash and bearing preload. This is typically a specialized job.hard $$$ · shop-level job, $500+
Applies to: 5th generation 4Runner, 2010 to 2024, with the 1GR-FE 4.0L V6 and the 5-speed automatic. Assumes the stock configuration; trim-specific items (KDSS, sunroof, A/C) are noted where they apply.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| Gear oil for your truck | Changing diff oil to the factory spec | Shop on Amazon |
| Fluid transfer pump | Filling through the fill or check plug | Shop on Amazon |
| Axle seal | Replacing a leaking axle or pinion seal | Shop on Amazon |
| UV leak detection kit | Pinpointing exactly where a leak starts | Shop on Amazon |
Go deeper
Other drivetrain problems on the 5th Gen 4Runner
More 5th Gen 4Runner problems
- Rust on the frame, flaking, or holes in the frame rails (Frame & Body)
- KDSS warning, fluid leak, or clunking and uneven ride on a KDSS truck (Steering & Suspension)
- Oil leak or oil smell from the front of the engine (Engine)
- Rough idle, shaking, or misfire with a flashing check engine light (Fuel & Ignition)
- Check engine light with P0171 or P0174, system too lean (Fuel & Ignition)
- Check engine light with P0420 or P0430, catalyst efficiency (Emissions)
All 16 5th Gen 4Runner symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.