MMX OEM Differential Dual Mount (No Bush) | G8x | M2 | M3 | M4

MMX OEM Differential Dual Mount – BMW G87 M2, G80/G81 M3 & G82/G83 M4

Improve rear differential stability and drivetrain response on your BMW G8X M car with the MMX OEM Differential Dual Mount.

Designed for the BMW G87 M2, G80/G81 M3 and G82/G83 M4, the MMX Dual Differential Mount adds a second point of support to the rear differential by utilising the factory secondary bush mounting hole.

By increasing differential support under acceleration and dynamic driving, the mount helps reduce unwanted movement, improve driveline response and provide a more stable connection between the differential and chassis.

This version is supplied without the secondary differential bush, allowing you to use the factory BMW rubber bush or select a compatible polyurethane or solid upgrade separately.

Why Upgrade the G8X Differential Mount?

The rear differential is subjected to substantial torque loads during acceleration.

Under hard driving, movement within the differential mounting system can reduce drivetrain precision and allow the differential housing to move relative to the chassis.

The MMX Dual Differential Mount reinforces the factory arrangement by adding a second supported mounting point.

This can help provide:

• Reduced differential movement
• Sharper drivetrain response
• Improved power delivery
• Increased rear drivetrain stability
• Better driver feedback
• More consistent behaviour under hard acceleration

MMX developed the system for tuned cars, track use and performance-focused road vehicles where drivetrain loads are considerably higher.

Key Features

• MMX OEM Differential Dual Mount
• Designed for BMW G8X M cars
• Adds a second differential support point
• Uses the factory secondary bush mounting hole
• Reduces unwanted differential movement
• Improves drivetrain response
• Helps improve rear axle stability under acceleration
• Can improve tyre traction
• CNC-machined from 6061-T6 billet aluminium
• Retains the factory differential sump
• No differential fluid drain required
• No permanent modifications required
• Fully reversible
• Compatible with OEM rubber differential bush
• Compatible with suitable polyurethane bushes
• Compatible with suitable solid differential bushes
• Supplied with required mounting hardware
• Secondary bush not included
• MMX part number MMR55-1606

Adds a Second Differential Mounting Point

The standard G8X differential mounting arrangement includes provision for a secondary mounting position.

The MMX Dual Differential Mount takes advantage of this factory location to add an additional supported mounting point.

This provides greater control over the differential housing without requiring fabrication, drilling or modification to the chassis.

By supporting the differential at an additional location, the assembly becomes more resistant to movement under torque load.

Reduced Differential Movement

When engine torque reaches the rear differential, the housing experiences substantial reaction forces.

Any compliance within the mounting system allows the differential to move.

The MMX Dual Differential Mount is designed to limit this movement and provide a more stable drivetrain platform.

Reducing movement can contribute to:

• More immediate power delivery
• Sharper throttle transitions
• Improved drivetrain connection
• More predictable rear axle behaviour
• Better response during aggressive acceleration

Improved Drivetrain Response

Reducing compliance in the differential mounting system can make the drivetrain feel more direct.

During throttle application, less movement within the mount means more of the driver's input is transferred through the drivetrain rather than being absorbed by mounting compliance.

For performance-focused drivers, this can create a more connected feeling between the engine, differential and rear wheels.

Improved Traction

MMX highlights improved tyre traction as one of the potential benefits of increasing differential stability.

By reducing unwanted drivetrain movement, power can be transmitted to the rear axle more consistently during hard acceleration.

This can be particularly useful on:

• Tuned G87 M2 models
• High-output G80/G81 M3 builds
• Modified G82/G83 M4 models
• Track-day cars
• Vehicles running high-grip tyres

Helps Reduce Diff & CV Seal Weeping

MMX also identifies excessive differential movement as a potential contributor to differential and CV seal weeping under hard acceleration.

By providing additional support and reducing movement of the differential housing, the dual mount can help reduce the forces acting on these areas.

For hard-driven or higher-powered G8X cars, this provides an additional reliability-focused benefit.

Retains the Factory Differential Sump

A major advantage of the MMX design is that the original BMW differential sump remains fitted.

The dual mount bolts directly into position without requiring the factory sump to be removed or replaced.

This means installation does not require:

• Removing the differential sump
• Draining differential oil
• Refilling the differential
• Replacing the factory sump

This makes the upgrade considerably simpler than solutions requiring a complete differential cover or sump replacement.

No Differential Fluid Change Required

Because the original sump remains untouched, the differential oil does not need to be drained purely to install the mount.

This reduces installation complexity and avoids unnecessary disturbance of the differential fluid system.

It also makes the MMX mount a practical upgrade to fit independently of a differential service.

Compatible with the OEM Rubber Bush

This no-bush version is designed to work with the factory BMW differential bush, part number:

33 31 6 899 168

This makes it possible to add the structural benefits of the dual-mount arrangement while retaining the compliance and refinement of an OEM rubber bushing.

For predominantly road-driven cars, this can provide an appealing balance between improved drivetrain support and factory-style NVH characteristics.

Compatible with Polyurethane Bushes

Owners wanting a firmer drivetrain setup can pair the MMX mount with a suitable aftermarket polyurethane differential bush.

Polyurethane generally provides less movement than the factory rubber component while retaining some compliance.

This can make it a useful middle ground for:

• Fast-road cars
• Tuned vehicles
• Occasional track use
• Owners wanting greater drivetrain precision without moving to a fully solid mount

Compatible with Solid Differential Bushes

The MMX mount can also be paired with a compatible solid differential bush.

A solid mounting arrangement minimises compliance and provides the most direct connection between the differential and chassis.

This is generally better suited to:

• Dedicated track cars
• Competition builds
• Highly modified vehicles
• Drivers prioritising response over refinement

Solid mounts can significantly increase noise, vibration and harshness compared with an OEM rubber setup.

Why Is the Bush Not Included?

This version of the MMX Dual Differential Mount is intentionally supplied without a secondary bush.

This allows the customer to choose the bush specification that best suits the vehicle.

Options can include:

• OEM BMW rubber
• Aftermarket polyurethane
• Solid differential bush

This means the same MMX mounting bracket can be used across road, fast-road and track-focused builds.

6061-T6 Billet Aluminium Construction

The MMX Differential Dual Mount is CNC-machined from 6061-T6 billet aluminium.

This material provides a strong balance of:

• High strength
• Low weight
• Durability
• Dimensional accuracy

CNC machining also allows the mount to achieve the precise fit required for direct installation onto the G8X drivetrain.

OEM-Style Fitment

MMX designed the mount around the factory BMW mounting points.

No chassis cutting, welding or drilling is required.

This gives the upgrade an OEM-style installation while still providing a substantial increase in differential support.

Fully Reversible

Because no permanent vehicle modifications are required, the MMX dual mount can be removed later if required.

The vehicle can therefore be returned to its original differential mounting configuration.

This makes the upgrade particularly attractive for owners who want improved performance without permanently modifying the chassis.

Ideal for Tuned G8X Models

As engine output increases, the loads transmitted through the differential mounts also rise.

The MMX Dual Differential Mount is particularly worthwhile for vehicles running:

• MMX Power Control Module
• ECU tuning
• Increased boost
• Performance exhaust upgrades
• Higher-grip tyres
• Track-focused modifications

Adding drivetrain support alongside increased engine output can help make the car feel more controlled and consistent.

Ideal for Fast-Road & Track Use

The MMX Dual Differential Mount is suitable for a wide range of performance applications.

It is particularly useful for:

• Spirited road driving
• Fast-road builds
• Track-day vehicles
• Tuned G8X M cars
• High-grip tyre setups
• Cars experiencing increased drivetrain movement

The choice of secondary bush allows the setup to be tailored to the intended use.

OEM Rubber vs Polyurethane vs Solid Bush

OEM Rubber

Best suited to road cars where refinement remains important.

Advantages include:

• Lowest NVH
• Factory-style comfort
• Improved differential support when combined with the dual mount

Polyurethane

Offers increased stiffness while retaining some compliance.

Best suited to:

• Fast-road cars
• Modified road vehicles
• Occasional track use

Solid

Provides maximum drivetrain rigidity.

Best suited to:

• Track-focused builds
• Motorsport
• Drivers willing to accept increased NVH

BMW G87 M2

The MMX Differential Dual Mount is compatible with the BMW G87 M2.

The G87's S58 engine is capable of producing substantial torque even in factory specification, with tuned examples placing significantly greater demands on the rear drivetrain.

The dual mount helps provide additional differential control under hard acceleration.

BMW G80 / G81 M3

The mount is compatible with the BMW G80 M3 and G81 M3 Touring.

For fast-road, tuned and track-focused M3 builds, additional differential support can help sharpen the way power is transferred through the rear drivetrain.

BMW G82 / G83 M4

The BMW G82 M4 Coupe and G83 M4 Convertible are also supported.

The upgrade is particularly relevant to higher-output M4 builds and cars used regularly for aggressive road or circuit driving.

Compatibility

Designed for BMW G8X M cars including:

• BMW G87 M2 – 2023+
• BMW G80 M3 – 2021+
• BMW G81 M3 Touring – 2021+
• BMW G82 M4 – 2021+
• BMW G83 M4 Convertible – 2021+

MMX lists the mount for all M-car variants within these chassis.

What's Included?

The MMX OEM Differential Dual Mount package includes:

• MMX CNC-machined 6061-T6 aluminium differential mount
• Required installation hardware

Important: Secondary differential bush is not included.

The mount is compatible with the factory BMW rubber bush 33 31 6 899 168 or suitable aftermarket polyurethane and solid alternatives.

Explore More BMW G8X Drivetrain Upgrades

Looking to improve your G8X drivetrain further? Explore our range of BMW M performance and chassis products.

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