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


This part does not affect the base vehicle warranty when installed by mountune.

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:

  • Improves turn-in (helps with drift mode!)
  • Maximise traction
  • Minimise wheel spin
  • A maintenance-free design which retains the standard oil lubrication

Exclusively available via mountune, 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 RS 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

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Aidan Gallagher

Quaife Differential Fitting at HQ

Recently had the Quaife differential fitted along with the sport spring kit and breather plate down at HQ. Dropped the car off at 8am Thursday morning and the car was ready for collection by lunchtime on Friday ahead of schedule. Fred was very helpful and accommodating explaining any queries I had very well. Was able to stay at the comfortable waiting area for as long as I needed. With the new differential, can immediately feel the improvement as it helped the car tuck tight into the corners with the extra grip. Delighted with the upgrade and will no doubt be down again for more Mountune quality products.

Clive R.
United Kingdom

RS Quaife ATB Differential

My experience was very professional friendly and helpful from Ryan and Amy.

Christopher C.
United Kingdom

Great, trustworthy installation by Mountune

Bought the Quaife differential including fitting during the Valentine's day 2018 10% discount. I phoned Mountune and booked my car in for the next available appointment which was 3 weeks later. Took my car in at 8am on Monday, picked it up at noon on Tuesday (although the car was ready to collect from 9am). The gearbox has to come out of the car, so this is a big job - but the Mountune workshop has done this many times before (so no need to worry). First impressions: steering feels noticeably heavier (the only difference that you notice at slow speed). No wheel hop or similar during low speed manoeuvring (which you can experience with other differentials). Car seems a little more composed upon heavy acceleration, but to be honest I haven't gone fast enough yet to notice! If Ford thought this differential was worthy of fitting to the RS Edition, then it's good enough for me (particularly in combination with FPM 375 or above).

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