BMW X3 F25 X5 F15 X4 F26 X6 F16 Transfer Box Auxiliary Transmission WARRANTY

Listing details

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

BMW X3 F25 X5 F15 X4 F26 X6 F16 Transfer Box Auxiliary Transmission WARRANTY is an original drivetrain component designed for BMW vehicles with all-wheel drive and an automatic transmission. It enables precise torque distribution between the axles, which translates into stable handling, predictable vehicle behavior, and safe drivetrain operation in various road conditions. This is a solution for users looking for a proven, used part with factory geometry and fitment.

Specifications and technical data

• SKU: 8643151
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8643151
• Substitutable numbers: 27108643151, 8643151, 27107505376, 7505376, 27108623348, 8623348, 27107639265, 7639265, 7643760, 27108612554, 8612554, 27107649784, 7649784, 27608643153, 8643153, 27607649785, 7649785, 27607639261, 7639261, 27107636180, 7636180, 5A371E2, 5A4A0C1, 27105A371E2, 1053712, 27108697255, 8697255
• Gearbox type: Automatic
• Category: Transfer Cases

Application and function in the drivetrain

The transfer box in BMW F25, F15, F26, and F16 models is responsible for transferring power from the automatic transmission to the front and rear axles, ensuring proper torque ratios. A correctly selected transfer box stabilizes the operation of the entire xDrive system, reduces wheel slip, and supports traction control systems, which is particularly important during dynamic driving and on surfaces with varying grip.

Thanks to its factory design, the BMW transfer box works with the vehicle's electronics and the automatic transmission according to the manufacturer's specifications, without the need for mechanical modifications.

Compatibility and part selection

The presented transfer box is intended for F-series BMW vehicles with all-wheel drive equipped with an automatic transmission. When selecting the component, it is crucial to compare the manufacturer's markings and interchangeable part numbers with the vehicle's specifications, which helps avoid problems with installation and subsequent operation.

The original design ensures:

• maintenance of the correct torque distribution characteristics between the axles,
• proper cooperation with factory control software,
• appropriate fitment with drive shafts and body mounts.

Operating characteristics with an automatic transmission

In vehicles with an automatic transmission, the transfer box works in close synchronization with the transmission control module and electronic stability systems. A properly selected transfer box:

• ensures smooth power delivery during gear changes,
• minimizes jerking and unwanted vibrations in the drivetrain,
• supports even loading of drivetrain components.

As a result, the driver receives a predictable vehicle response both during calm driving and in situations requiring rapid acceleration or sudden load changes.

Condition, origin, and benefits of choosing a used part

The offered transfer box is a used component, sourced from a dismantled BMW vehicle. Choosing an original part from the secondary market allows you to maintain the factory performance parameters of the drivetrain while reducing costs compared to purchasing a new unit. For many users, this is a reasonable compromise between quality and budget, especially when repairing advanced drivetrain components.

If you want to better understand when purchasing a used drivetrain component is cost-effective and what to look for when choosing one, it is worth reading the article Used gearbox – when is it worth it and what you need to remember, which discusses practical aspects of selecting and operating such components.

Support for BMW drivetrain expansion and repair

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 additional transfer boxes, housings, or related sub-assemblies, check out the available parts in the BMW transfer boxes category.

Selecting the correct transfer box for a specific BMW F25, F15, F26, or F16 model allows you to restore the proper operation of the all-wheel drive, reduce the risk of secondary damage, and ensure stable vehicle handling in daily use.