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Quaife diff Quaife diff
Quaife diff
Quaife diff

Quaife ATB Differential for Focus ST225

£725 (£604.17 ex vat) In Stock

Replacement TIMKEN Bearings *

Fitting Service (Hull UK) *

Driveshaft seals *

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More Info

Quaife ATB Differential for Focus ST225 

Quaife ATB Differential for Focus ST225 M66 is suitable for Ford Focus ST225 using the M66 gearbox. A direct replacement for the standard Ford open differential, the Quaife ATB Helical LSD differential transforms your car”s performance.

Unlike a conventional plate-style limited slip differential, the Ford Focus ST225 M66 Quaife ATB Helical LSD differential relies on gears rather than clutch plates for its operation. That means it is much smoother in operation.

The Ford Focus ST225 M66 Quaife ATB Helical LSD differential never locks harshly with a set pre-load of wheel slip across the driven axle, like a conventional LSD. Rather, the Ford Focus ST225 M66 Quaife ATB Helical LSD differential automatically biases the torque away from the spinning wheel across the axle, to a constantly varying degree, and never locks.

The Ford Focus ST225 M66 Quaife ATB Helical LSD differential has many benefits over a standard open differential, including maximising traction and minimizing wheelspin, eliminating torque steer and snatching in front wheel drive cars compared to conventional LSD units, and a maintenance-free design which retains the standard oil lubrication.

The Ford Focus ST225 M66 Quaife ATB Helical LSD differential is proven in circuit and drag racing, rallying and road use, and is produced from Corus steel billets, and is CAD designed and CNC machined, then inspected to ISO 9001 standards

Quaife ATB Helical LSD differentials are used by Ford, General Motors and Daimler-Chrysler as original equipment.

The Quaife ATB Helical LSD differential for Ford Focus ST225 M66 is also now subject to a lifetime warranty (subject to terms and conditions).

Optional Replacement TIMKEN Bearings

When fitting your LSD you can either re-use the existing standard bearings and races, or we recommend you replace with new. We can supply Timken Bearings and Races as an option on this product. Unlike the standard bearings which have plastic cages, these are high speed rated with steel cages. This option includes two new diff bearings and races, and is included FREE when you choose our optional fitting. If you”re opting for our fitting service then you don”t need to add the Timken bearings as an option below!


Fitting is available at our dreamscience HQ in Hull, UK, priced at £350.00. Please select this below before adding to cart, and choose “Collection” as your delivery option otherwise you will be charged carriage!

Our technicians have been specifically trained by Quaife – to our knowledge the only technicians in the UK to receive this training – so you can be sure you”re getting the best possible service!

Shipping info: 

This product is available for shipping inside the UK, Europe and the rest of the world. Shipping times may vary. Extra charges may be incurred if your locations is considered Remote. If this is the case a member of our team will be in touch shortly after you have completed your order.

Fitting info: 

Our Experienced Techs will take good care of your car whilst it is with us. We Follow a strict procedure for each job to ensure a high level of quality is delivered. This Procedure is below: – Protect Vehicle Steering wheel with Cover.  – Protect Seats with Cover.   – Pre-work test Drive to fault find before we carry out work.  – Pull in, lift and Strip Vehicle.  – Book out parts and Fit.  – Rebuild – Road test, check over.  – Final Clean down and Handover.

Technical Assistance. 

For fitting tips and advice please call our tech helpline on +44 1482 224433 to speak with one of our Qualified Technicians or email in on

Special Offer!

Buy the full RS mk2 Clutch Kit and our Quaife Limited Slip Differential including full fitting by our dreamscience technicians for a one off price of just £1645 including VAT!
SAVE £225 on our individual item prices!



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