BMW F20 F21 F30 125d 325d Output Drive Shaft Left N/S Driveshaft 7640257

BMW F20 F21 F30 125d 325d Output Drive Shaft Left N/S Driveshaft is an original drivetrain component from the Drivetrain mounting parts and brackets group, designed for installation on the left side of the rear axle. This solution allows for maintaining the factory drivetrain characteristics, ensuring stable system operation and predictable vehicle handling.

Specifications and technical data

• SKU: 7640257
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7640257
• Substitutable numbers: 33207640257, 7640257
• Location on the vehicle: Left
• Category: Drivetrain Hardware & Fasteners

Purpose and function in the drivetrain

The rear driveshaft in BMW F-series models is responsible for the mechanical transmission of torque from the final drive to the wheel, while simultaneously compensating for suspension movements. The version described as left, rear is dedicated for installation on the driver's side, which is significant when selecting parts based on suspension geometry and final drive construction.

The component belongs to the Drivetrain mounting parts and brackets group, meaning it works in conjunction with other drivetrain components, such as the wheel hub, rear differential, or suspension elements, creating a cohesive, factory-engineered assembly.

Benefits of using an original BMW driveshaft

Using an original driveshaft in BMW F20, F21, and F30 models in 125d and 325d versions allows for maintaining drivetrain performance parameters in accordance with the manufacturer's specifications. This is particularly important in higher-power vehicles, where the drivetrain operates under greater load.

• preservation of factory geometry and driveshaft length,
• proper cooperation with joints and the wheel hub,
• appropriate transmission of longitudinal and lateral loads,
• reduction of vibrations and unwanted play in the drivetrain.

As a result, the driver receives consistent handling and predictable traction, and the drivetrain retains its properties over the long term of operation.

Vehicle placement and fitment

The presented driveshaft is intended for installation on the left side of the rear axle. Proper selection of the installation side is crucial for:

• correct alignment of joints relative to the hub and differential,
• maintaining appropriate operating angles at various suspension deflections,
• avoiding excessive stress in the drivetrain.

Selecting a component compatible with the BMW F-series construction allows for installation based on factory mounting points, without the need to modify other elements.

Product characteristics and condition

The offered driveshaft belongs to the group of original BMW components, which helps maintain the technical integrity of the entire drivetrain. The product is marked as used, which in practice means it comes from dismantling and has been verified for further operational suitability. This type of solution is often chosen by users who want to combine compliance with factory specifications with a more cost-effective repair.

In the case of driveshafts, it is particularly important that the element is selected in accordance with the manufacturer's markings – the product has an assigned OEM part number and interchangeable numbers, which facilitates compatibility verification with a specific engine and body version.

Technical support, ecology, and additional materials

Choosing a used drivetrain component aligns with the principles of a circular economy – it reduces the consumption of raw materials and energy needed to produce a new part, while simultaneously allowing for the effective use of components from dismantling. If you want to better understand how this approach affects the environment and car maintenance costs, check out the article: Circular economy in your garage – how choosing used parts from dismantling really supports environmental protection and your wallet?.

If you are interested in a broader context of using used components in cars of this brand, it is worth reading the guide: Used parts for BMW – is it worth it? Key benefits for brand fans, which discusses, among other things, issues of quality, cost-effectiveness, and component selection.

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 driveshafts, brackets, or mounting elements, check out the available parts in the BMW Drivetrain mounting parts and brackets category.