ASTON MARTIN VANTAGE 4.3 V8 Manual Transmission

Aston Martin V8 Vantage 4.3 (2005–2008) features a 6-speed manual transaxle developed by Graziano. Unlike the “Sportshift” automated version, this true manual is highly regarded for its mechanical feel and durability, though it has several specific maintenance requirements that owners should be aware of.

Technical Specifications

• Manufacturer: Oerlikon Graziano (Italy).

• Gearbox Type: 6-speed longitudinal manual transaxle.

• Part Number: 6G33-7002-AL (Current replacement assembly).

• Final Drive Ratio: 3.91:1 (Limited-slip differential).

• Layout: Rear-mounted transaxle connected to the engine via an aluminum torque tube and carbon fiber propeller shaft.

Key Maintenance & Known Issues

While the gearbox itself is robust, the components surrounding it require attention:

1. The “Heavy” Clutch (Stock)

The original 4.3L single-plate organic clutch is notoriously heavy and is often described as having a “short” life (typically 25,000 to 45,000 miles depending on usage).

• Upgrade Path: Most owners now replace the stock unit with the Vantage 4.7L twin-plate clutch or aftermarket options from VelocityAP or Bamford Rose. These provide a much lighter pedal feel and significantly longer life.

2. High Reverse Gear

The reverse gear on the 6-speed manual is geared quite “tall” (almost equivalent to 2nd gear).

• Risk: Reversing up a steep incline can easily burn the clutch friction material. Always try to reverse on flat ground or minimize slipping the clutch when backing up.

3. Gearbox Oil Service

• Fluid Type: Originally specified as Bot 402, now commonly serviced with Castrol Syntrans 75W-80 or Shell Spirax S6.

• Interval: Specialists recommend changing the transaxle oil every 4 years or 40,000 miles.

• Shifting Feel: If the gearbox feels “notchy” when cold (particularly 1st to 2nd), a fluid change often significantly improves the shift quality.

4. The “Bellcrank” Wear

The gear selector uses a cable-operated system with a bellcrank assembly on the side of the gearbox. Over time, the plastic bushings can wear, leading to a “sloppy” shifter feel or difficulty engaging 1st/Reverse. This is a common and relatively simple fix with a bushing refresh kit.

Essential Hardware Checklist

If you are performing a gearbox or clutch service, these are the critical “ancillary” parts:

• Transaxle Oil Filter: 4G43-27-10490 (Internal mesh filter that should be cleaned/inspected).

• Drain Plug Washer: 4G43-27-10245-PK (Copper washer).

• Reverse Light Switch: 6G33-8F875-AA (Prone to leaking oil through the electrical connector over time).