2nd Gen Tacoma: Whine, howl or leak from the rear or front differential

Checks, in order

1. Gear oil level and condition
   Remove the fill plug and check that oil sits at the hole. Look and smell for metal flakes, burnt odor or milky fluid.
   easy $ · under about $50
2. Seals
   Look for oil at the pinion seal and at the axle ends. Oil on the rear brakes means an axle seal leak that needs fixing.
   easy $ · under about $50
3. When the noise happens
   Note whether the sound changes on throttle vs. coast, and at which speeds. Whine under throttle often points to pinion bearing or gear mesh.
   easy $ · under about $50
4. Axle bearings
   Raise the rear, spin each wheel by hand and listen for roughness. A growl that gets louder in turns is a wheel bearing.
   medium $$ · about $50 to $500
5. Gear setup
   If the noise began after a regear, have the pattern and backlash checked by a shop experienced with Toyota differentials.
   hard $$$ · shop-level job, $500+

Applies to: 2005 to 2015 Tacoma with the 2TR-FE 2.7L four-cylinder and 1GR-FE 4.0L V6, 2WD, PreRunner and 4WD. Both engines use timing chains and a serpentine-belt-driven water pump.

Tools and parts for these checks

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Go deeper

• Toyota Regear Chart: Tire Size vs Gear Ratio vs RPM
• Toyota Tacoma Fluid Capacities & Types (2005–2024+)

Other drivetrain problems on the 2nd Gen Tacoma

• Vibration or jolt from the driveline under acceleration or when stopping

More 2nd Gen Tacoma problems

• Frame rust: flaking, holes or a soft frame (Frame & Body)
• Rear sag, squeaks or a cracked rear leaf spring (Steering & Suspension)
• Clunk, knock or rattle going over bumps (Steering & Suspension)
• Steering feels stiff, rattles or wanders (Steering & Suspension)
• Shaking, shimmy or violent wobble at highway speed (Steering & Suspension)
• Humming or rumbling from the front that changes with speed (Front Axle)

All 16 2nd Gen Tacoma 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.