Automatic Gearbox BMW Z4 E89 18i 20i 28i Petrol N20 7630579 GA8HP45Z WARRANTY

Listing details

The gearboxes are sold with a 90-day warranty! They were tested before removal and are in full working order.

Automatic Gearbox BMW Z4 E89 18i 20i 28i Petrol N20 7630579 GA8HP45Z WARRANTY is a factory-spec, precision transmission from the Automatic Gearboxes group, designed specifically for use with N20 petrol engines in the Z4 E89 model. It offers smooth gear shifting, high operating refinement, and stable torque transfer, which translates into a comfortable and predictable driving experience.

Specifications and technical data

• SKU: 7630579
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7630579
• Substitutable numbers: 24008632465, 8632465, 24008616004, 24008601659, 24008601662, 24007643945, 24007630579, 24007642251, 24007640274, 8616004, 8601659, 8601662, 7643945, 7630579, 7642251, 7640274
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Automatic Transmission

Purpose and compatibility

The described automatic gearbox has been engineered to work with N20 series petrol units in the BMW Z4 E89 in 18i, 20i, and 28i versions. The GA8HP45Z design is optimized for the characteristics of these engines, providing appropriate gear ratios for city, highway, and dynamic driving. By using an original transmission from the Automatic Gearboxes family, the factory gear-shifting logic and proper alignment with the vehicle's electronics are maintained.

Operating characteristics and technical specifications

The GA8HP45Z automatic gearbox belongs to the category of modern torque converter transmissions that combine ease of use with efficient utilization of the petrol engine's power. The applied architecture allows for:

• smooth and predictable gear changes without jerking,
• efficient acceleration across the full rev range,
• stable torque transfer at higher speeds,
• maintaining proper operating refinement in both comfort and more dynamic modes.

The transmission has been designed to work with BMW control systems, which facilitates integration with factory driving modes and driver assistance systems. Proper matching of the gearbox to the fuel type, which is petrol, promotes optimal use of the N20 engine's characteristics.

Application in the BMW Z4 E89 drivetrain

The GA8HP45Z automatic gearbox plays a key role in the BMW Z4 E89 drivetrain, responsible for efficient power transfer to the wheels while maintaining the comfort typical of this series. In combination with the N20 petrol engine, it ensures:

• consistent operation with factory control software,
• appropriate gear ratios for touring and sporty driving,
• balanced fuel consumption while maintaining adequate dynamics.

For users looking for a transmission tailored to the specifics of the Z4 E89 model, choosing an original gearbox from this series allows for maintaining driving parameters close to factory standards and reducing the risk of compatibility issues.

Condition, origin, and benefits of choosing a used gearbox

The offered automatic gearbox comes from the BMW group and is an OEM component, which means it retains the original design and parameters specified by the manufacturer. As a used part, it represents a cost-effective solution compared to new components or full remanufacturing, while maintaining factory specifications. For many users, this is a reasonable compromise between price and quality, especially in the case of advanced automatic transmissions.

If you are considering whether choosing a used automatic gearbox is right for your car, it is worth checking out our guide, which discusses the cost-effectiveness of such a solution, compatibility issues, and a comparison with remanufacturing – details can be found in the article Used gearbox – when is it worth it and what you need to remember.

Support for selection and drivetrain upgrades

Selecting the right automatic transmission for a specific engine version and model year of the BMW Z4 E89 requires attention to manufacturer markings, fuel type, and gearbox type. A properly selected GA8HP45Z automatic gearbox helps avoid installation and electronic issues, and reduces the risk of improper drivetrain operation. If necessary, it is worth consulting a mechanic or an automatic transmission specialist to confirm compatibility with your specific vehicle.

If you are planning a comprehensive repair or upgrade of your BMW's drivetrain and need other elements from the same group, such as torque converters, control units, or additional transmission components, check out the available parts in the BMW Automatic Gearboxes category.