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Looking to make a DIFFerence to your Fiesta ST MK7! An up-rated Differential is a great addition to any modified Fiesta ST.

Pictured and 3 types of Differential.

1st up is one most of you are probably familiar with the Quaife ATB LSD. 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 Fiesta/ Focus Quaife ATB Helical LSD differential relies on gears rather than clutch plates for its operation. That means it is much smoother in operation.
The 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 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 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 Quaife is a great addition for most Road users who have increased in power and want to do the odd track day.


2nd up is the Wavetrac LSD.
Why is the Wavetrac better than all other Automatic Torque Biasing Limited Slip Differentials, or ATB LSDs?
To best understand how the Wavetrac® is truly different from the other gear differentials on the market, you first have to understand the primary problem that the Wavetrac® solves.
The problem: Loss of drive during zero or near-zero axle-load conditions.
Zero axle-load is a condition that occurs during normal driving, but creates the most noticeable problems when driving in extreme conditions. Zero or near-zero axle-load is the condition that exists when there is ‘no-load’ applied through the drivetrain, when one drive wheel is nearly or completely lifted (often in aggressive cornering). It also occurs during the transition from engine driving a vehicle to engine braking and back, even with both drive wheels firmly on the ground.
Here’s how that loss of drive hurts you:
1) If you lift a wheel, all gear diffs except Wavetrac®, will NOT power the other wheel.
2) During the transition from accel to decel, all gear diffs except Wavetrac®, do nothing.
The Wavetrac®, however, is different:
The innovative, patented, Wavetrac® device in the center of the diff responds during these exact conditions when zero or near-zero axle-load occurs. At or near zero axle-load, the axles (and therefore each side gear in the diff) start to turn at different speeds.
This speed differential causes the Wavetrac® device to step into action:
Precisely engineered wave profiles are placed on one side gear and its mating preload hub. As the two side gears rotate relative to each other, each wave surface climbs the other, causing them to move apart.
Very quickly, this creates enough internal load within the Wavetrac® to STOP the zero axle-load condition.
The zero axle-load condition is halted, and the drive torque is applied to the wheel on the ground (the gripping wheel)… keeping the power down.
Some gear differentials rely solely on preload springs to combat loss of drive. The drawback is that you can’t add enough preload to prevent loss of drive without creating tremendous handling and wear problems at the same time. So, to avoid these problems, the preload from ordinary spring packs must be reduced to a level that renders them ineffective at preventing loss of drive. The Wavetrac® is the only differential that can automatically add more load internally when it’s required.
In the case where both wheels are on the ground during zero axle load, such as during a transition to deceleration, the Wavetrac® device is able to prepare the drivetrain for when the zero torque condition stops, eliminating the delay seen with ordinary gear diffs.
What this means for you as a driver is that power is delivered to the gripping wheels for more time and in a more constant manner – making you faster and improving stability.
The Wavetrac® truly is different – and its innovative features can make a real difference in your car’s performance.

The Wavetrac is a great Hybrid Diff as i would call it. It has drive-ability of a ATB but with the characteristics of a plated type Differential. Great for fast road and the keen track enthusiast.


3rd and lastly we have the 3J Driveline Plated Differential.
3J Driveline Ltd Designed and manufactured NXG (NeXt Generation) Fiesta ST MK7 B6 Lsd. The strongest, most progressive and versatile LSD unit in the market place. The 3J plate pack always runs with 8 active surfaces, even in our lighter settings, giving maximum surfaces and surface area contact during use. Our new pre-load spacer helps generate the pre-load. Rather than just have the 2 or 3 settings of other units, we can ‘fine tune’ to particular pre-load settings complemented with our choice of ramps, to get the perfect LSD set up for you. The Bevel and planet gear pack has been designed to be the smoothest mesh, biggest and strongest tooth profile that we have ever been involved with. Eliminating the rattle, and excessive back lash of other units. Also With the added benefit of dual ramps. Dual Ramps available are 30/90, 40/90, 30/60, 45/45, 50/90, plus more by request

if your looking for an all our track spec Differential a Plated Diff is the way to go. They are still usable on road too, but does have a downside of being quite noisy and clunky on lock when moving slowly.


All 3 types of differential are available from myself through Jam-Sport we can supply or offer fitting too. Quaife’s are through Mountune so can be a little tricky to get hold of sometimes, but happy to check availability if interested. Wavetrac are due to land within the next couple of days & 3J stock have just arrived with us.

If anyone has any questions please let me know, or if you would like a price on fitting etc then get in touch.

Ben@Jam-Sport See MoreSee Less

4 weeks ago

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Scott Parrish

4 weeks ago

Getting a updated diff is deffo a must it’s by far the best mod I have on my car

4 weeks ago

Charlie Walker

4 weeks ago

Great right up definitely helped me pick which one to go for now. Thanks

4 weeks ago

J-l Symonds just in case u want a wee read lol

4 weeks ago

Sam Jupp

3 weeks ago


3 weeks ago

Mark Pearce

1 week ago

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