BMW X3 E83 2.0d M47N2 Auxiliary Transmission Transfer Case Box ATC-400 WARRANTY

BMW X3 E83 2.0d M47N2 Auxiliary Transmission Transfer Case Box ATC-400 WARRANTY is an original drivetrain component from the Transfer cases group, designed to work with the xDrive system in the BMW X3 E83 model with the 2.0d M47N2 engine. The design of the ATC-400 transfer case ensures precise torque distribution between the axles, which translates into stable handling and predictable vehicle behavior in various road conditions.

Specifications and technical data

• SKU: 3455134-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 3455134
• Substitutable numbers: 3455134, 27103455134, 3455139, 27103455139, 7535868, 27107535868, 7573222, 27107573222, 7573214, 27107573214, 3424081, 27103424081, 3435185, 27103435185, 7546816, 27107546816, 7555296, 27107555296
• Gearbox type: Automatic
• Category: Transfer Cases

Purpose and role in the drivetrain

The ATC-400 transfer case is responsible for dynamic drive management within the xDrive system, working in conjunction with the transmission and other drivetrain components. In the case of the BMW X3 E83 2.0d M47N2, it is a key component ensuring:

• efficient torque transfer to both axles,
• driving stability under varying traction conditions,
• smooth engagement and disengagement of the rear-wheel drive,
• increased traction during acceleration and driving in difficult conditions.

Thanks to its factory design tailored to the specific configuration of the BMW X3 E83, the ATC-400 transfer case allows for maintaining the original drive characteristics without the need to modify other components.

Compatibility and OEM selection

The offered item comes from the BMW line and complies with the manufacturer's factory standards. The selection of a transfer case for a specific vehicle should always be verified by the OEM number and interchangeable numbers, which minimizes the risk of incorrect fitment. In practice, this means:

• the ability to precisely match the 2.0d M47N2 engine version,
• compatibility with the factory drive control software,
• no need for mechanical modifications to mounts and connections.

As a result, installation is predictable, and the drivetrain maintains performance parameters close to factory specifications.

Operating characteristics with an automatic transmission

The ATC-400 transfer case has been designed to work with an automatic transmission, which is significant for both driving comfort and the durability of the entire system. In this configuration:

• torque distribution control is integrated with the automatic transmission's logic,
• gear shifts are performed taking into account current load and traction,
• the transfer case is adapted to the dynamic loads characteristic of an automatic transmission.

Such a combination ensures smooth operation of the xDrive system, reduces jerking, and supports even wear of system components.

Benefits of using an original used transfer case

Choosing a used, original ATC-400 transfer case for the BMW X3 E83 2.0d M47N2 allows you to combine cost control with maintaining the factory design of the drivetrain. This type of component:

• maintains compliance with BMW's engineering design,
• allows you to avoid problems typical of replacements with uncertain specifications,
• is an attractive cost alternative to new components.

For workshops and individual users, this means the possibility of carrying out repairs in a technically correct manner while reducing expenditure on parts.

To better understand how to safely select used drivetrain components, including transfer cases and transmissions, it is worth checking out our expert guide: Why it is worth buying used transmissions and engines – facts instead of myths. The article discusses, among other things, selection by OEM numbers, common myths, and real savings compared to new parts.

Expanding repairs within the BMW drivetrain

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other elements from the same group, such as additional transfer cases, housings, or related drivetrain components, check out the available parts in the BMW Transfer cases category.

For a broader perspective on the cost-effectiveness of using used components in premium cars, including BMW, the following material may also be helpful: Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026, which discusses current market realities and reasonable repair strategies.