Audi A4 B8 A5 8T Gearbox Mount Transmission Support Bracket Holder 8K0399115S

Audi A4 B8 A5 8T Gearbox Mount Transmission Support Bracket Holder is a component from the Engine mounts group, responsible for providing stable support for the gearbox and ensuring proper load distribution within the drivetrain. The use of this bracket in vehicles with petrol engines helps to reduce vibrations, improve the refinement of the drivetrain, and maintain the correct geometry of the powertrain mounting.

Specifications and technical data

• SKU: 8K0399115S-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0399115S
• Substitutable numbers: 8K0399115S, 8K0 399 115 S
• Fuel type: Petrol
• Category: Engine Mounts

Purpose and function in the drivetrain

The presented gearbox support bracket has been designed for Audi A4 B8 and Audi A5 8T models with petrol engines. As a component from the Engine mounts group, it is responsible for maintaining the gearbox in the correct position relative to the chassis and the power unit, which has a direct impact on driving comfort and the durability of other components.

A stable gearbox mount limits unwanted movement during acceleration, engine braking, and gear changes. As a result, the level of noise and vibration transmitted to the cabin is reduced, and cooperating components – such as drive shafts, joints, or other mounts – operate under more predictable load conditions.

Benefits of using an original bracket

Using an original gearbox support bracket in an Audi A4 B8 or A5 8T ensures:

• precise fitment to factory mounting points on the chassis and gearbox,
• maintenance of the drivetrain stiffness designed by the manufacturer,
• reduction of vibrations and knocking resulting from excessive play in the mount,
• better protection of other drivetrain components against overloads.

Thanks to this, driving comfort remains at a level close to the factory standard, and the risk of premature wear of other components is lower than in the case of randomly selected replacements.

Assembly and operational characteristics

The gearbox support bracket is structurally prepared for operation in vehicles with petrol engines, which means it is matched to the vibration and load characteristics typical for this type of unit. The element works in conjunction with other engine and gearbox mounts, creating a coherent system for damping vibrations and transferring forces to the chassis.

When replacing a worn mount with the presented bracket, you can expect:

• more stable behavior of the powertrain during sudden load changes,
• reduction of noticeable vibrations on the chassis and in the cabin,
• more consistent operation of the gear shifting mechanism.

Part condition and practical application

The offered gearbox support bracket is a used part, which makes it a cost-effective solution while maintaining the original design and fitment for the specific Audi A4 B8 and A5 8T generation. It is a good solution for users who want to restore proper gearbox mounting without sacrificing the factory specification of the component.

Replacing a worn mount with a functional bracket allows for restoring predictable drivetrain behavior, which is particularly important in cars used intensively or with higher mileage, where play in the mounts may already affect driving comfort and safety.

Related components and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional mounts, supports, or vibration damping elements, check the available parts in the Audi engine mounts category.

When planning service work, it is also worth considering the condition of the cooling system, which is crucial for the durability of the power unit and its associated mounts. More on the impact of temperature on engine operation and ways to economically operate cooling components can be found in the article: Summer heat vs. cooling system: used radiators and fans as a guarantee of savings.

If you are considering whether a used or refurbished part is a better choice, comparing both solutions in practice may also be helpful – this issue is discussed in more detail in the guide: Refurbished or used original – which part to choose for repairs?.