BMW 3 4 Series F30 F31 F32 Front Differential 330D 335D 2.56 Ratio 7648879

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order.

BMW 3 4 Series F30 F31 F32 Front Differential 330D 335D 2.56 Ratio is a front differential with xDrive, designed for BMW models with the B57 engine. This part belongs to the Differentials category and is a key component of the drivetrain, responsible for the proper distribution of torque to the front axle and stable vehicle handling.

Specifications and technical data

• SKU: 7648879
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7648879
• Substitutable numbers: 7648879, 31507648879
• Location on the vehicle: Front
• Category: Differentials

Purpose and function in the xDrive system

The described front axle works with the xDrive system, ensuring proper distribution of driving force between the front wheels depending on traction conditions. This allows the system to maintain predictable handling characteristics on both dry surfaces and in low-grip conditions.

The 2.56 ratio is selected for harmonious cooperation with the transmission and rear differential, which translates into:

• stable engine RPM at highway speeds,
• consistent operation of the xDrive system across the full speed range,
• predictable drivetrain response during acceleration and engine braking.

Construction and vehicle placement

The differential is structurally adapted for installation in the front of the vehicle, on the axle that interfaces with the drive shafts. Vehicle placement: front ensures a direct connection to the xDrive drivetrain, which is important for correct suspension geometry and the durability of associated components.

As an item in the Differentials category, it is responsible for:

• differentiating the rotational speed of the wheels on the same axle during cornering,
• transferring torque from the drive shaft to the half-shafts,
• reducing stress in the drivetrain during dynamic driving.

Performance characteristics and vehicle compatibility

The front drive axle with a 2.56 ratio is dedicated to specific drivetrain configurations in BMW 3 and 4 Series models with the B57 unit and xDrive system. Selecting the correct differential has a direct impact on:

• proper cooperation with the rear differential and gearbox,
• the absence of unwanted stress in the drivetrain,
• correct operation of electronic stability control systems.

The part is sourced from dismantling, which allows for an economical replacement while maintaining the manufacturer's original specifications. Original BMW origin facilitates proper fitment with mounts and accessories without the need for modifications.

Condition, verification, and service application

The differential is offered as a used part, which in workshop practice often represents a reasonable compromise between repair costs and maintaining factory performance parameters. Such components are commonly used for:

• post-accident repairs within the drivetrain,
• mechanical damage to gears or the housing,
• refurbishment of fleet vehicles and high-mileage cars.

Before installation, it is recommended to perform a standard check of seals, backlash, and the condition of the lubricant, in accordance with BMW service procedures. A correctly selected and installed differential restores full functionality of the xDrive system and reduces the risk of secondary damage.

Ratio selection and additional technical materials

Proper selection of the front axle ratio for a specific drivetrain configuration is crucial for the durability of the entire system. To better understand the relationships between differential ratios, engine characteristics, and driving style, it is worth checking our guide: Dismantled drive axles and differentials – how to choose ratios for your driving style. The article discusses practical examples, definitions, and the most frequently asked questions related to replacing axles and differentials.

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 front drive axles, differentials with different ratios, or differentials for other models, check the available parts in the BMW Differentials category.