BMW F70 F74 F78 M235iX B48R Automatic Transmission DCT GD7S40FG 5B15258 WARRANTY

Listing details

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

BMW F70 F74 F78 M235iX B48R Automatic Transmission DCT GD7S40FG is an advanced dual-clutch automatic transmission designed to work with BMW B48 series petrol engines. It enables fast, smooth gear shifting, ensuring dynamic drivetrain response and comfortable driving in both daily and sporty conditions. Thanks to the factory BMW design, the transmission maintains full compatibility with the electronics and drivetrain architecture of the F70, F74, and F78 M235iX models.

Specifications and technical data

• SKU: 5B15258
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5B15258
• Substitutable numbers: 5B15258, 28005B15258
• Fuel type: Petrol
• Gearbox type: Automatic
• Part type: Automatic Transmission
• Category: Automatic Transmission

Technical characteristics of the DCT GD7S40FG transmission

The presented transmission belongs to the Automatic transmissions category and uses DCT dual-clutch technology, which allows for parallel preparation of the next gear and minimizes interruptions in torque delivery. The use of automatic transmission control in combination with a petrol engine ensures:

• fast gear changes while maintaining drivetrain stability,
• consistent operation with factory BMW driving modes,
• efficient utilization of the B48R unit's characteristics.

The dual-clutch design of the transmission is particularly beneficial in sporty cars, such as the M235iX, where both precision and repeatability of the drivetrain operation are essential.

Purpose and compatibility with the drivetrain

The BMW F70 F74 F78 M235iX B48R Automatic Transmission DCT GD7S40FG has been developed to work with the B48R petrol engine-based drivetrain in BMW F-series models. It integrates with the factory engine control, traction control systems, and safety systems, allowing the vehicle's original operating logic to be maintained. As a result:

• transmission control is performed in accordance with factory shift maps,
• compatibility with driver assistance systems is maintained,
• the drivetrain operates in a predictable and repeatable manner.

Such matching is particularly important when replacing the transmission in cars with increased power, where the stability and predictability of the drivetrain operation are of key importance for the durability of the components.

Condition, verification, and preparation for installation

The offered transmission comes from the segment of used BMW components, which allows for an optimal combination of purchase cost and preservation of the manufacturer's original specifications. Before installation, a standard workshop procedure is recommended, including, among others, leak testing, connector verification, and preparation of the oil system in accordance with BMW guidelines. Properly performed installation and adaptation of the transmission in the vehicle enables:

• stable transmission operation under full load,
• correct communication with the vehicle's control modules,
• preservation of factory gear shifting parameters.

Benefits of using an original BMW automatic transmission

The use of an original automatic transmission in a BMW M235iX with a B48R petrol engine brings a number of measurable benefits. The most important include:

• full structural compatibility with the factory drivetrain and vehicle electronics,
• preservation of the operating characteristics intended by the manufacturer,
• the ability to use sporty driving modes and manual gear shifting (if the vehicle is equipped with them),
• optimal transfer of the petrol engine's torque across the entire rev range.

For users expecting dynamic, yet predictable drivetrain operation, this configuration represents a technically coherent solution that allows maintaining the vehicle's character in accordance with BMW's design intent.

Technical support and additional materials

To better plan the transmission replacement and assess its condition before installation, it is worth familiarizing yourself with practical tips regarding diagnostics and purchasing used transmissions. Detailed information, typical failure symptoms, and advice on choosing a transmission can be found in the article Transmission: manual, automatic or DSG – typical failures and a guide to buying a used transmission.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other components from the same group, such as automatic transmissions, control modules, or transmission accessories, check the available parts in the BMW automatic transmissions category.