NEW Mercedes Quaife ATB Limited-Slip Differential – QDF42B

The popular Quaife Automic Torque-Biasing LSD is now available and in stock for the Mercedes 190e models, exclusively at Birds.

Once installed, drivers will notice an immediate difference as the Quaife ATB automatically biases torque across the axle to the wheel with most grip. Unwanted wheel-slip is greatly reduced, enabling drivers to exploit the full potential of their Mercedes for the first time.

All standard Mercedes cars come from the factory fitted with an “open differential” – a simple device that allows the driving wheels to turn at different speeds. The problem with the open diff is that it can only ever apply the same amount of torque to both driving wheels, so when a wheel slips, it will only put through the amount of torque it requires to power that spinning wheel (very little!). Additionally, Mercedes use various electronic traction systems that “curb” power to the drive wheels during traction loss (indicated by the flashing traction light on your dashboard).

The Quaife ATB (auto torque-biasing) limited-slip differential is the ultimate traction solution. Its patented gear-based design allows a progressive transfer of torque away from the spinning wheel and onto the wheel with more grip. Unlike conventional LSDs, it does not use clutches or other wearing internals, meaning that Quaife can give a limited lifetime warranty on their units, which requires no servicing or maintenance. It is completely silent in operation and works perfectly with the car’s electronics.

This application also fits certain C class and CLK models, including the C200, C230, CLK 320 and many others.


Part number: QDF42B

List price: £959.02 ex VAT | £1150.82 inc VAT

Installed price: £1598.23 ex VAT | £1917.88 inc VAT


Price list for Mercedes Quaife LSD kits

More information on the Quaife ATB limited-slip diff

More information on Mercedes Quaife conversions