BMW E46 Non-M 6-Speed Steel Lower Transmission Mount

Upgrade your BMW drivetrain with the STROM Motorsports E46 Non-M 6-Speed Steel Lower Transmission Mount, a heavy-duty replacement for the factory aluminium gearbox mounting bracket.

Designed for BMW E46 6-speed manual applications, this fully welded steel transmission bracket provides a stronger and more durable alternative to the original aluminium mount, which can be prone to cracking under high-power, track and extended race use.

Manufactured from heavy-duty 1/4" steel and finished with a corrosion-resistant yellow zinc coating, this transmission mount is ideal for performance BMW E46 builds, race cars and B48 engine swaps using compatible GS6 6-speed gearboxes.

Heavy-Duty Replacement for the Factory Aluminium Mount

The factory BMW aluminium transmission bracket can become a potential weak point when subjected to increased power, aggressive driving or prolonged motorsport use.

The STROM replacement is constructed from fully welded 1/4" steel, providing a robust solution for demanding drivetrain applications.

Whether you're strengthening a factory 6-speed E46 or completing a modern engine conversion, this mount provides a purpose-built upgrade without relying on the original aluminium component.

Ideal for B48 Engine Swaps

In addition to standard BMW applications, this lower transmission mount can be used for BMW B48 engine swaps when paired with compatible:

• GS6-37DZ transmissions

• GS6-53DZ transmissions

This makes it an excellent drivetrain component for custom BMW builds where strength, reliability and correct gearbox positioning are essential.

Key Features

• Heavy-duty BMW 6-speed lower transmission mount

• Designed for non-M BMW E46 applications

• Replaces factory aluminium transmission bracket

• Replaces BMW P/N 22316760531

• Fully welded construction

• Manufactured from 1/4" steel

• Increased durability for high-power applications

• Ideal for track and extended race use

• Corrosion-resistant yellow zinc coating

• Compatible with selected GS6 6-speed transmissions

• Suitable for B48 engine swap applications

• Compatible with multiple BMW E46 and Z4 models

• Ideal for road, track, race and motorsport builds

BMW E46 Fitment

Compatible with all E46 body styles, including Sedan, Touring, Coupe, Convertible and Compact, on applicable 6-speed configurations.

Compatible applications include:

• BMW E46 320d / 320Cd / 320td – M47N

• BMW E46 325i / 325Ci / 325ti – M54

• BMW E46 330i / 330Ci – M54

• BMW E46 330d / 330Cd – M57N

BMW Z4 E85 / E86 Fitment

Also compatible with applicable BMW Z4 applications, including:

• BMW Z4 E85 2.5i – M54

• BMW Z4 E85 3.0i – M54

• BMW Z4 E85 3.0si – N52

• BMW Z4 E85 M 3.2 – S54

• BMW Z4 E86 3.0si – N52

• BMW Z4 E86 M 3.2 – S54

Always verify your transmission and existing mounting configuration before ordering.

Upper Transmission Mount Compatibility

For BMW E46 installations, this lower gearbox mount should be paired with either:

• STROM Aluminium E46 Non-M 6-Speed Upper Transmission Mount

• STROM E46 Non-M 6-Speed Steel Upper Transmission Mount

Using the matching upper and lower mounting components provides a complete transmission mounting solution for compatible E46 6-speed applications.

Built for Performance & Motorsport Use

For high-power road cars and track-driven BMWs, drivetrain mounting components need to withstand considerably more stress than they may experience under normal road use.

The STROM Motorsports BMW E46 Non-M 6-Speed Steel Lower Transmission Mount provides a robust alternative to the factory aluminium bracket, combining fully welded 1/4" steel construction with a corrosion-resistant yellow zinc finish.

Whether you're strengthening an E46 330i 6-speed, building a dedicated race car or completing a B48 engine swap with a GS6 transmission, this steel gearbox mount provides a strong and durable foundation for your drivetrain.