Genuine BMW M Performance Limited Slip Differential LSD M140i M240i F2X 340i 440i F3X

Genuine BMW M Performance Limited Slip Differential – M140i, M240i, 340i & 440i

Transform the way your rear-wheel-drive BMW puts its power down with the Genuine BMW M Performance Limited Slip Differential.

Designed as a mechanical rear axle differential, the M Performance LSD helps reduce unwanted wheelspin by distributing torque more effectively between the rear wheels when one side has less available traction.

The result is improved traction, more controlled power delivery and greater confidence when accelerating out of corners or driving the car closer to its limits.

This genuine BMW upgrade is particularly worthwhile for tuned cars, fast-road builds and vehicles used on track, where the limitations of the standard open differential can become much more noticeable.

Why Upgrade to the BMW M Performance LSD?

The standard open differential allows the rear wheels to rotate independently, but when one tyre begins to lose traction, useful drive can be compromised.

The M Performance limited slip differential helps address this by directing more usable torque towards the wheel with greater available grip.

This can provide:

• Improved traction
• Reduced inside-wheel spin
• Stronger corner-exit performance
• More predictable power delivery
• Improved rear-end control
• Greater confidence during performance driving

Key Features

• Genuine BMW M Performance product
• Mechanical limited slip differential
• Direct replacement rear differential assembly
• Improves rear-wheel traction
• Helps reduce unwanted wheelspin
• Distributes torque more effectively across the rear axle
• Improves corner-exit performance
• More controlled handling at the limit
• Ideal for fast-road driving
• Highly beneficial for track use
• Excellent upgrade for tuned B58-powered cars
• Automatic transmission applications only

Mechanical Limited Slip Differential

The M Performance LSD uses a mechanical limited slip design.

When there is a difference in available traction between the rear wheels, the differential helps limit excessive slip and allows more torque to be transferred through the tyre that can use it effectively.

This gives the rear axle a much more performance-focused behaviour than a conventional open differential.

Improved Traction

Traction is one of the most noticeable benefits of installing an LSD.

Instead of allowing one rear wheel to spin away power when grip becomes limited, the M Performance differential helps make better use of the traction available across both rear tyres.

This is particularly noticeable during:

• Hard acceleration
• Corner exits
• Wet conditions
• Uneven surfaces
• Fast-road driving
• Track use

Better Corner Exit Performance

The benefit of an LSD becomes especially noticeable when accelerating out of a corner.

As weight transfers and the inside rear tyre becomes more lightly loaded, an open differential can allow that wheel to spin.

The M Performance LSD helps maintain a more useful distribution of torque across the rear axle, allowing you to accelerate out of the corner with greater control.

More Predictable Rear-End Behaviour

BMW M Performance designed the differential to improve control in more demanding driving situations.

More predictable rear-axle behaviour can make it easier to understand how the car will respond when accelerating close to the available grip limit.

This is especially useful on higher-powered or tuned vehicles.

Ideal for the BMW M140i & M240i

The M140i and M240i combine a powerful B58 engine with rear-wheel drive, making an upgraded differential particularly worthwhile.

The M Performance LSD helps the chassis make better use of the available power, especially on:

• Tuned cars
• Performance tyres
• Fast-road builds
• Trackday cars

Rather than adding more engine power, an LSD helps you use more of the performance the car already has.

Ideal for the BMW 340i & 440i

The same principle applies to the F3x-generation 340i and 440i.

The M Performance differential helps improve traction and rear-axle control, making it a worthwhile upgrade for drivers looking to make these cars more capable during spirited road or track driving.

Particularly Beneficial on Tuned Cars

As engine output increases, the standard open differential can become more of a limitation.

For tuned B58-powered cars, the M Performance LSD can help improve how effectively additional torque reaches the road.

This makes it a logical supporting upgrade alongside:

• ECU tuning
• Intake upgrades
• Intercooler upgrades
• Suspension upgrades
• Performance tyres
• Brake upgrades

Excellent Track Upgrade

For vehicles used on track, a limited slip differential can make a substantial difference to how effectively power can be applied out of slower and medium-speed corners.

Benefits can include:

• Reduced inside-wheel spin
• More effective throttle application
• Better corner-exit traction
• More consistent rear-axle behaviour

For track-focused M140i, M240i, 340i and 440i builds, the LSD is one of the most worthwhile drivetrain upgrades available.

Genuine BMW M Performance Component

This is a Genuine BMW M Performance differential, developed specifically for compatible BMW applications.

For owners who want an OEM-quality solution rather than an aftermarket differential conversion, it provides a factory-engineered upgrade.

Automatic Transmission Only

This product is designed specifically for compatible automatic transmission models.

It is not suitable for manual transmission vehicles.

Please confirm your exact vehicle specification before ordering.

Vehicle Compatibility

BMW 1 Series F20 / F21

• M140i
• Automatic transmission only

BMW 2 Series F22 / F23

• M240i
• Automatic transmission only

BMW 3 Series F30 / F31

• 340i
• Automatic transmission only

BMW 4 Series F32 / F33 / F36

• 440i
• Automatic transmission only

Professional Installation Recommended

Differential replacement is a specialist drivetrain job and professional installation is strongly recommended.

The installer should ensure:

• Correct fitment
• Correct mounting
• Correct fluid specification
• Appropriate torque procedures
• Final inspection before use

Ideal Supporting Upgrades

The M Performance LSD works particularly well alongside:

• Coilovers
• Lowering springs
• Uprated suspension bushes
• Rear subframe inserts
• Differential inserts
• Performance tyres
• Uprated brakes
• Chassis braces

Combining traction and suspension upgrades can significantly improve the overall balance of the car.

What's Included?

Each quantity includes:

• 1x Genuine BMW M Performance Limited Slip Differential

Suitable for specified automatic transmission applications.

Explore More BMW Performance Parts

BMW 1 Series F20/F21 – Explore suspension, handling and performance upgrades for the M140i and wider F20/F21 platform.

BMW 2 Series F22/F23 – Explore suspension, handling and performance upgrades for the M240i and wider F22/F23 platform.

BMW 3 Series & 4 Series F3x – Explore performance and chassis upgrades for the 340i, 440i and wider F3x platform.

Suspension & Handling – Browse coilovers, bushes, differential upgrades and chassis components.