BMW M140i M240i Quaife ATB Limited Slip Differential – Diff Only – B58
Transform the way your BMW M140i or BMW M240i drives with the Quaife ATB helical limited slip differential. This rear differential upgrade puts more usable power to the ground, cuts single wheel spin, improves traction on corner exit and in wet conditions, and delivers faster, more consistent lap times for fast-road and track use. If you are searching for a BMW M140i LSD, BMW M240i LSD, Quaife LSD M140i, Quaife LSD M240i, or B58 differential upgrade, this is the proven solution.
Why choose a Quaife ATB LSD for your M140i M240i B58?
- Massive traction and grip gains for BMW M140i and BMW M240i B58 models
- Eliminates inside wheel spin for stronger launches and confident corner exits
- Smooth, quiet operation with no harshness for daily driving
- No clutch plates to wear and no routine servicing required
- Works seamlessly with factory electronics including ABS, DSC and traction control
- UK designed and manufactured with a lifetime warranty
The Quaife ATB is a torque biasing helical gear limited slip differential. Unlike clutch-plate LSDs, the ATB uses precision-cut gears to automatically apportion torque to the wheel with the most grip. That means better stability under power, stronger acceleration out of bends, and predictable handling in all conditions without chatter or added noise. It requires no special maintenance and is renowned for OEM-like refinement.
Real-world results for BMW M140i and BMW M240i owners
We run Quaife ATB LSDs on our own builds and our customers love the difference. Expect more confidence on wet roads, improved turn-in and traction on B-roads, and meaningful gains on track days and drag launches. This is the go-to BMW rear diff upgrade for the M140i and M240i.
Compatibility and search-friendly fitment terms
Suitable for BMW M140i and BMW M240i with the B58 engine. If you are searching for:
- BMW M140i limited slip differential
- BMW M240i limited slip differential
- BMW F20 F21 F22 F23 LSD upgrade
- Quaife ATB helical LSD for B58
- BMW rear differential upgrade M140i M240i
this Quaife ATB LSD ticks every box. Not sure on exact compatibility for your car or build date? Contact us and we will help confirm.
What is included
- Diff only – Quaife ATB limited slip differential unit
This installs into your existing differential housing. Professional installation is recommended.
Fitting and installation
For fitting, we recommend Nforcd in Warwickshire. Request an installation quote: Sales@nforcd.com
Key benefits at a glance
- BMW M140i LSD upgrade and BMW M240i LSD upgrade for B58 models
- Improved traction, stability and corner exit performance
- Maintenance-free helical design with no clutch packs
- Refined road manners and OEM-like drivability
- UK engineered and manufactured with lifetime warranty
- Ideal for fast road, track day and daily driving
Upgrade your BMW M140i or BMW M240i with the Quaife ATB helical limited slip differential and experience the B58’s performance with traction you can trust.