Ford Focus ST Mk2 Limited-slip Differentials

Limited-slip differentials are one of the best real-world upgrades you can bolt onto a fast road or track-focused Ford Focus ST Mk2. A quality LSD transforms how the car puts power down, especially when you are running extra tuning mods like remaps, big turbos or sticky tyres. Instead of wasting power on a spinning inside wheel, the diff sends more drive to the tyre with grip, so you get harder launch performance, stronger traction out of tight bends and more confidence in wet or uneven conditions.

There are a few main styles of performance differential to consider. Helical or ATB-style diffs are very popular for fast road and occasional track use, as they offer smooth operation with minimal extra noise or harshness. Plate or clutch-type LSDs are more track-biased and give very aggressive lock-up and strong drive, ideal if your Ford spends more time chasing lap times. Whichever style you go for in this Limited-slip Differentials range, the aim is the same: more usable grip and a more predictable car when you are really leaning on it.

Upgrading the differential is also a smart move for reliability if you are pushing higher torque than stock. The standard open diff, and sometimes the factory electronic “fake” diff control, can struggle when you add serious power. A proper mechanical LSD helps protect the drivetrain by spreading load better between both driven wheels. For many Ford Focus ST Mk2 owners, an LSD actually feels like a bigger step forward than more power, because it lets you make the most of the performance you already have.

To get the best from any clutch and drivetrain upgrade in the Clutch & Drivetrain family, it is worth planning the whole setup together. Think about clutch, flywheel, gearbox, diff and fluid choices as a package, based on how you really drive the car. Correct diff oil, proper run-in and professional installation all make a big difference to longevity and feel. Set up right, a limited-slip diff is one of those upgrades you notice every single time you drive, from tight B-roads to track days, making your Ford Focus ST Mk2 feel sharper, faster out of corners and far more planted when you push on.