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6 reviews


Quaife ATB Differential [Mk3 Focus ST]

Available from mountune, the Quaife ATB helical LSD differential for Mk3 Focus ST fits the MMT6 gearbox. A direct replacement for the standard Ford open differential, the Quaife differential transforms your car's performance.

Unlike a conventional plate-style limited slip differential, the Quaife differential relies on gears rather than clutch plates for its operation. That means it is much smoother in operation and never locks harshly with a set pre-load of wheel slip across the driven axle.

Instead, the Quaife differential automatically biases the torque away from the spinning wheel, across the axle to a constantly varying degree.

Benefits over a standard open differential:

  • maximise traction
  • minimise wheel spin
  • reduced torque steer and snatching in front wheel drive cars
  • a maintenance-free design which retains the standard oil lubrication

Quaife differentials are proven in circuit and drag racing, rallying and road use. All Quaife differentials are produced from Corus steel billets, and are CAD-designed and CNC machined before being inspected to ISO 9001 standards.

Customer Reviews
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Filter Reviews:
    Taiwan Taiwan

    Quaife ATB Differential-QDF41Z

    Shipping is fast and product quality is good.

    Jean-Jacques L.

    More CONTROL !

    Fast shipping by Mountune. Perfect mount at Kris Durie (Unicars-Ford) the Mountune specialist in Belgium. The only downside is a little heavier steering but what a difference in torque control ! Wheelspin and wheelhop are seriously reduced, torque steer has magically disappeared ! The car is faster, especially due to the earlier out-of-corner acceleration. On a track day it means a win of several seconds . The car is simply so much easier to control and that was a real issue after the stage 3 tuning. It's an expensive peace of kit but worth every penny because now and only now I can bring all the power on the road. Under wet conditions my ST was no fun to drive, now it is. 0-100 times are 0,3 sec down too. In one word: a necessary addition to the Focus ST.

    mountune Quaife ATB Differential Reviewmountune Quaife ATB Differential Review
    Bob B.

    Nothing short of awesome!

    Anyone who's got a Focus ST mark 3 and hasn't got a Quaife diff fitted should do so before any other mods. The amazing handling and cornering you get is unbelievable! The stock just isn't in the same league! Totally transformed my car and wheel spin and jiggly corners are a thing of the past! Many thanks Mountune, another winner- awesome bit of super quality machinery! Beautiful!