Home > Shop Performance > Ford Focus Performance >

Quaife ATB Differential - Focus ST 2013-2018
Quaife Focus St Helical Atb Differential 2013-2018 Qdf41Z | Mountune


WARNING : California Residents Prop 65 Information

Availability: Usually Ships in 1 to 2 Business Days
Product Code: 2363-ATB-AA


Quaife ATB Differential - Focus ST 2013-2018

Maximize traction and performance with the Quaife ATB helical limited slip differential for the Focus ST / MMT6 gearbox. A direct replacement for the standard Ford open differential, the Quaife ATB differential transforms your car's performance and improves cornering. 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.

Quaife PN QDF41Z

Benefits over a standard open differential:
  • Maximize traction
  • Minimize wheel spin
  • Reduced torque steer and snatching in front wheel drive cars
  • 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
  • Quaife Automatic Torque Biasing Differential - Track Tested and Proven

Recommended product
mountune ATB Differential Installation Kit - Focus ST

Atb Differential Installation Kit, Focus St (2363-Atb-Hw) | Mountune

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 10 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 Game Changer September 4, 2020
Reviewer: E W from Saint Clair, PA United States  
The difference is immediately noticeable.Torque steer is gone,just smooth even distribution of power.Yes,it should have been standard equipment.I love cornering on uneven surfaces,nice powerful launch.Didn't try a hard launch yet,i imagine that wheel-hop is nonexistent.Big shout-out to Scott's Transmissions Lebanon,Pa.A shop with a broad knowledge of alot of these LSD'S.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Worth Every Penny July 24, 2020
Reviewer: Scott from Michigan  
Hands down the best modification for the Focus ST. Lets you put the power down in a corner without triggering the traction control or spinning the inside tire. Before I had this installed there was no way you could hook first or even second gear at full throttle, but now all I get is a little chirping from the tires and off you go. If its good in the dry its even better in the wet. The ST has so much torque its almost impossible to drive hard in the rain but this diff makes it so much more manageable. I'd give it 6/5 stars if I could. It turns the Focus ST into what it always was meant to be.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Best upgrade ever, no debate February 8, 2020
Reviewer: David from Philadelphia PA  
The differential will make your ST wicked fast. Just upgrade and you will see what I mean, car feels like its on rails. Literally feels like the car is AWD after the install

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Should have been standard equipment December 11, 2019
Reviewer: Patrick from Alberta  
Tames the otherwise wayward ST. The improvement is hard to overstate. If you only do one upgrade, do this. Forget about adding power without it. It'll just be wasted in torque steer, wheel spin, and terror. If you live in a cold climate, it also makes a huge improvement in winter driving.  

Was this review helpful to you?

  0 of 0 people found the following review helpful:
5 of 5 Straight as an arrow August 15, 2019
Reviewer: Timothy Robinson from Whitby, ON Canada  
Best Buy to date takes all the torque from one wheel and puts it to both exactly where it should be

Was this review helpful to you?

View All Customer Reviews

Browse for more products in the same category as this item:

Shop Performance > Ford Focus Performance
Shop Performance > Ford Focus Performance > Focus Drivetrain
Motorsport > Quaife