Audi A4 B8 Engine Transmission Gearbox Support Mount Bracket 4G0399115S

Audi A4 B8 Engine Transmission Gearbox Support Mount Bracket is a component from the Transmission and drivetrain mounts group, designed for use with automatic transmissions in Audi vehicles. It is responsible for providing stable support for the gearbox, reducing vibrations, and properly transferring loads to the chassis, which results in smoother drivetrain operation and increased driving comfort.

Specifications and technical data

• SKU: 4G0399115S
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0399115S
• Substitutable numbers: 4G0399115S, 4G0 399 115 S
• Gearbox type: Automatic
• Part type: Transmission Mount
• Category: Transmission & Drivetrain Mounts

Function and role of the transmission mount bracket

The transmission mount bracket in the Audi A4 B8 plays a key role in supporting the automatic transmission and dampening vibrations generated by the powertrain. A properly selected component:

• stabilizes the position of the gearbox relative to the chassis,
• limits the transmission of vibrations and noise into the cabin,
• supports the correct operation of the drivetrain during acceleration and engine braking,
• reduces the load on other mounts and drivetrain suspension components.

Thanks to the appropriate stiffness and geometry of the mount, automatic transmission shifting comfort remains at a stable level, and drivetrain reactions are predictable.

Compatibility with automatic transmission

The presented mount bracket is intended for use with the automatic transmission in the Audi A4 B8. The design of the mount is adapted to the operating characteristics of an automatic transmission, which generates different loads than a manual gearbox. Properly selected mounting points and the shape of the component help maintain:

• the correct alignment of the gearbox relative to the half-shafts and the driveshaft,
• system stability during gear changes,
• safe transfer of torque to the drivetrain.

Selecting a component compatible with the transmission type is important for both durability and operational safety.

Benefits of using an original Audi mount

The transmission mount bracket intended for the Audi A4 B8, as an OEM component, ensures factory-fit to the mounting points on the chassis and the gearbox housing. In practice, this means:

• no need for modifications or adjustments to mounting holes,
• preservation of the original drivetrain geometry,
• consistency with other engine and transmission mounts.

In the case of components responsible for supporting the gearbox, using a part consistent with the manufacturer's design helps reduce the risk of incorrect transmission alignment, premature wear of joints, and unwanted vibrations.

Application in service and drivetrain diagnostics

Replacing the transmission mount bracket is recommended, among other things, when symptoms such as excessive vibration during start-up, knocking during gear changes, or noticeable "shifting" of the powertrain during sudden acceleration or deceleration occur. During service, it is worth paying attention to:

• the condition of rubber elements working with the mount bracket,
• stiffness and the absence of cracks in the mounting zones,
• proper tightening of bolts in accordance with the manufacturer's procedure.

Selecting parts by OEM number or interchangeable numbers allows for precise matching of the mount to a specific Audi A4 B8 configuration, which is particularly important for different engine variants and automatic transmission types.

Support in selection and additional materials

To minimize the risk of error when purchasing used drivetrain components, it is worth using expert materials regarding selection procedures based on OEM numbers and VIN numbers. A detailed discussion of this topic, along with examples and cost analysis, can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths, which discusses the practical aspects of purchasing used drivetrain components.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Audi and need other elements from the same group, such as additional brackets, mounts, or transmission mounting components, check the available parts in the Audi transmission and drivetrain mounts category.