ASTON MARTIN VANTAGE V12 gearbox ED23-7002-BC

The part number ED23-7002-BC identifies the 7-speed Sportshift III automated manual transmission (ASM) specifically for the Aston Martin V12 Vantage S (produced approximately 2013–2018).

This gearbox is a high-performance transaxle manufactured by Graziano. It was a major evolution over the 6-speed units, designed to handle the massive 620 Nm (457 lb-ft) of torque from the 5.9L AM28 V12 engine while being 25 kg (55 lbs) lighter than the previous manual equivalent.

Technical Specifications

• Type: 7-Speed Automated Manual (Single Clutch).

   

• Manufacturer: Oerlikon Graziano.

• Clutch Type: Twin-plate organic clutch (designed for high thermal capacity).

• Shift Speed: Capable of gear changes in under 50 milliseconds in Sport mode.

• Lubrication: Forced oil lubrication with an external oil cooler to manage the heat generated by the V12.

The “BC” Suffix Significance

In Aston Martin parts coding, the suffix (AA, AB, BC) denotes the revision level. The “BC” revision typically includes:

• Updated internal synchronizer materials for smoother low-speed engagement.

• Improved seals for the hydraulic actuator interface.

• Compatibility with the latest ASM control software (TCM) to reduce “clutch crawl” wear.

Critical Maintenance for Sportshift III

Because this is a single-clutch automated system, it requires specific driving techniques and maintenance to avoid premature failure:

1. Clutch Learn Procedure: After installation or battery disconnection, a “Clutch Bite Point” learn procedure must be performed using the Aston Martin AMDS diagnostic tool.

2. Hydraulic Fluid: The gear selection is handled by a hydraulic power unit (HPU). This uses Pentosin CHF 11S. If the fluid level drops or becomes contaminated, shift quality will degrade rapidly.

3. Reverse Gear Caution: Like all Sportshift units, reversing uphill is the fastest way to burn the twin-plate clutch. Always ensure the clutch is fully engaged before applying significant throttle.

Common Failure Points

• Hydraulic Actuator Leaks: Often mistaken for a gearbox failure, the external shift actuator can develop leaks at the O-rings.

• Gear Position Sensor: If the car drops into Neutral (N) unexpectedly or refuses to select a gear, the internal position sensor is often the culprit.

Comparison Table: 6-Speed vs. 7-Speed (ED23)