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Quaife Differential [Mk3 Focus ST] - Fully Fitted

mountune are pleased to offer a fitting service for the Quaife differential, which transforms your Mk3 Focus ST'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.

This product includes a fixed labour charge for installation at mountune HQ in Hutton, Essex. This is a comprehensive drive in, drive out service, where you can make use of our comfortable and spacious customer waiting area while the work is being carried out.

Fitting time: 6 hrs

Included in the price is a Quaife ATB, fitting kit (seals, bearings and ring gear bolts), transmission oil and labour.

For full product information, click here.

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

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



Yes, our 'hub' boasts a comfortable waiting area with ample seating and workspace, free Wi-Fi, complimentary coffee and snacks, plus it features a large selection of our products and engines on display, too.

With over 40-years of designing, producing and fitting ECU/TCU software, components and engines, there is no better choice than mountune to have your performance parts fitted. Just like you, we're all petrolheads and treat your pride and joy with the care and attention that it deserves (as if it were our own car), so you can have complete peace of mind of not only the highest levels of workmanship, but that the people that designed the hardware or software are also installing it as originally intended.

You'll also be able to collect and spend mountune reward points too, helping you save money.

For all of our garage services our labour rate is currently £90 per hour (£75 +VAT).

Yes, when you choose mountune to install your performance parts and ECU/TCU tuning, not only can you spend any mountune reward points you've collected (in the usual way), you'll also earn mountune rewards too. So you can save more and spend less, regardless of how you shop with us.

Yes, we offer a comprehensive service for your Ford or VAG model using manufacturer approved or supplied parts, in accordance with our extensive schedule. Please see our separate servicing products, which can be added to your basket and booked individually, or together with performance upgrades.

It's also the only place you'll get a 'mountune' stamp in your book!

If you have other hardware you'd like installed together with your mountune upgrades please let one of our workshop team know and we'll do our best to accommodate you.

Our workshop currently operates Monday - Friday, 8.00am - 5.00pm. If you have any special requirements around dropping off or picking up your vehicle, please just let us know and we'll do our best to accommodate you.

Yes, whilst booking an upgrade or service online is the best way to secure products and services in our workshop, you'll normally be able to add additional performance parts on the day as well, should you wish.

Customer Reviews
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    Graham Y.
    United Kingdom United Kingdom

    Quaife LSD

    You've probably read the review by the advanced police driver, well I have done some time in single seaters and even driven Mansell's first Formula Ford round Oulton park and a lot of karting in my time so know something about front and rear wheel drives and drifting :-) What can I say about the lsd after having driven ST'S for about the last 8 year's! Wow just go and get yourself one, seriously the car alongside some lowering springs feels absolutely planted. Obviously not so noticeable in a straight line but give it some fast and twisty roads you'll absolutely love it, enter faster so positive the smoothness it give you is out of this world I cant rate it highly enough. Add to that the marvellous service you get from The Mountune team my special thanks go to Ryan and Ben who fitted it and best bang for bucks on upgrades I've spent so far. Not discounting a replcement turbo which I had to do :-) Many thanks Graham

    United Kingdom United Kingdom

    Quaife Differential

    If you want to go faster in your Mk3 Focus ST then this is an absolute must.There is a significant difference in handling,no longer jittery steering under either straight line acceleration or powering out of corners with the car feeling more planted to the road,