Mk3 Focus ST Quaife ATB Differential - Fully Fitted at mountune HQ


Available exclusively 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.

Fitted price includes the following:

  • Focus ST Quaife ATB differential
  • Installation kit (new bearings, seals and bolts)
  • Transmission fluid

Please note: the price shown for this product includes installation at mountune HQ in Hutton, Essex and is not transferrable to any other Ford dealer or installer. 

Please specify your preferred installation date in the 'notes' section when checking-out; our workshop team will then contact you back to confirm this date. If we can't accommodate your preferred choice, the team will discuss with you other available dates, that are still acceptable to you.

Customer Reviews

Based on 8 reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review
  • Reviews

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!


Quaife Differential

Had Quaife Diff fitted at Mountune HQ. Ryan made us feel very welcome and explained everything before being made comfortable in waiting area with TV, snacks and drinks. The diff has completely transformed the car, it is now more planted to the road and able to put the power down now without wheel hoping or torque steering when pulling away. Great product, top class service from Mountune Team, everyone made us feel special. Thanks again to Ryan and workshop guys who fitted diff, it made the 300 miles round trip worth it.

Mr H

Focus ST - Quaife Diff

Great experience from start to finish. Fantastic help, support and customer care. Got the Quaife diff fitted to my Focus ST in around 6.5 hours. Spent a lot of this in the really comfortable ‘lounge’, which has free snacks and drinks. There’s a TV, games consoles and magazines to keep you amused! Staff were all very friendly. The ST has often been too busy trying to throw me off the road (torque steering) or wheel-spinning to get the benefit of its power. This diff will really help to stabilise the car ready for the next stages - the MP275 and MP300! Looking forward to visiting again.


Excellent upgrade

Well worth the 260 mile round trip. The car is much firmer on corners and torque steer greatly reduced, thanks to the friendly and efficient team at Mountune.

Related Items