LAMBORGHINI AVENTADOR LP700 DIFFERENTIAL 01S409287A

the part number 01S409287A refers to the Front Axle Differential (Final Drive) for the Lamborghini Aventador LP700-4.

This component is a critical part of the Aventador’s permanent all-wheel-drive system, responsible for distributing power to the front wheels while allowing them to rotate at different speeds during cornering.

1. Technical Identification

• Part Number: 01S409287A

• Application: Primarily Aventador LP700-4 (2011–2016). It is specifically designed to mate with the Haldex-style coupling that manages torque split.

• Ratio: This unit has a specific final drive ratio calibrated to match the rear differential.

  • Caution: Never mix differentials from different model variants (e.g., trying to put an SVJ front diff into an LP700), as even a slight ratio mismatch will destroy the transmission or Haldex unit within miles.

2. 2026 Market Pricing (Estimated USD)

Because this is a major mechanical assembly, the cost is significant. Many units in 2026 are sourced as “Low Mileage” used parts due to the high cost of a new unit from Italy.

3. Common Failure Symptoms

If you are searching for this part in 2026, you may be experiencing:

• Whining or Grinding Noise: A high-pitched whine that increases with vehicle speed usually indicates worn pinion or carrier bearings.

• Vibration under Acceleration: If the internal gears are chipped or the lash is out of spec, you will feel a shudder through the floorboards.

• Fluid Leaks: The seals where the CV axles enter the differential (01S409189) are known to leak as they age. If the differential runs low on fluid (75W-90 Synthetic), it will overheat and fail rapidly.

4. Critical Installation Notes

• Haldex Service: When replacing the front differential, it is the perfect time to service the Haldex Coupling. You should replace the Haldex fluid and filter simultaneously to ensure the entire front drive assembly is fresh.

• Fluid Capacity: The differential itself typically takes about 0.6 to 0.8 liters of high-performance gear oil. Overfilling can cause pressure build-up and blown seals.

• Drain/Fill Plug Washers: Always use new crush washers. A small leak from a reused washer can lead to a multi-thousand dollar failure.