Ford Falcon: IRS Rear Stub Axle / Hub Bearing Wear

The FG/FGX Falcon's independent rear suspension uses a stub axle that presses into the rear knuckle, retained by a large nut. The hub bearing integrated into the knuckle wears prematurely — particularly on higher-mileage cars or those used with sustained high rear loads — producing clunking, wheel wobble, and vague rear-end handling. The bearing failure can be rapid once noise begins, and a collapsed bearing can allow significant lateral wheel movement, causing a safety hazard.

• Droning or rumbling noise from rear that increases with vehicle speed
• Noise changes tone or disappears when changing lanes (load shift off worn bearing)
• Clunking from rear over bumps or during acceleration and braking
• Detectable lateral play when wheel is grasped and rocked on a hoist
• Rear tyre feathering or uneven wear pattern

Spin the wheel by hand and listen for grinding or rumbling from the bearing. During a test drive, listen for a droning noise that changes pitch with speed or when weight is transferred cornering. Check for uneven or feathered rear tyre wear caused by bearing-induced toe change. If a workshop inspection is possible: With the car on a hoist, grasp each rear wheel at 9 and 3 o'clock and attempt to rock it side-to-side; any detectable play indicates hub bearing wear.

Parts involved: Wheel bearing.

$400 to $1,200 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Have the rear hub bearings ever been replaced or inspected?”
• “Has there been any clunking, droning, or unusual noise from the rear of the car?”
• “Has any rear tyre wear been observed that is uneven across the tread face?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.