Rear axle shaft SUBARU LEGACY 2011

OEM: 28421AJ021

Disassembled car photo

Engine running

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What is this part and why does it matter?

The rear halfshaft (driveshaft) transfers power from the differential to the rear wheel, allowing it to rotate.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

  • Clicking or clunking noise, especially when turning or accelerating
  • Vibration that increases with speed
  • Grease visible flung around the wheel well (torn CV boot)

Installation information

Requires removing the wheel and disconnecting from the hub and differential — always check for correct seating and torque the retaining nut to the specified value.

Frequently asked questions

This is a classic sign of a worn CV joint at the end of the shaft — the joint has to work at more of an angle when turning, which is when wear becomes audible.

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