Quaife ATB differential: FWD Ford Escort, Fiesta, Focus 1.4-1.8, Ka, Puma, ST150 (Type BC/IB5 gearbox) (QDF7Z)
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The Quaife ATB - As a direct replacement for the standard, factory ‘open’ differential, Quaife’s ATB unit can transform the performance of your car. Unlike a conventional plate-style limited slip unit, these units rely on gears, rather than clutch plates for its operation. That means it’s much smoother in operation, because unlike a conventional plate-style LSD, it never locks harshly with a set pre-load of wheel slip across the driven axle. Rather, it automatically biases the torque away from the spinning wheel across the axle, to a constantly varying degree and never locks.
To the driver (especially of a front-wheel drive car), the results are significant performance improvements; superior, controllable traction without the harsh steering wheel snatch or torque steer that have long been associated with performance differentials. These traction benefits can also be utilized in rear wheel drive vehicles, while Quaife ATB units offer significant traction advantages fitted to the front of four wheel drive cars.
The Quaife ATB differential has been designed to use the standard transmission oils and is covered by a limited lifetime warranty for both road and competition use. This makes the Quaife ATB differential a true 'fit and forget' upgrade that offers compromise-free performance and reliability. Key features of the Quaife ATB helical gear limited slip differential include:
- Safe, progressive and seamless in action, the Quaife ATB differential never 'locks'
- Controlled power is transmitted to all driven wheels, to maximise traction and minimise wheelspin, particularly in slippery conditions
- Fitment eliminates unwanted torque steer, understeer or oversteer
- Designed to work in harmony with road car OEM electronic stability programs
- Improves braking performance by reducing lock ups and minimises ABS intrusion
- Reduces tyre wear, especially on front wheel drive cars
- Gear operated with no components to replace - ever
- Direct replacement for factory standard 'open' differential unit
- Retains normal axle lubrication systems and maintenance schedule
- Over 250,000 units sold worldwide since the 1980s
- Backed by the confidence of a Quaife limited lifetime warranty
Quaife ATB Helical LSD differential for Ford BC/IB5 is suitable for Ford models using BC/IB5 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 BC/IB5 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 BC/IB5 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 BC/IB5 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 BC/IB5 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 BC/IB5 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. With over 370 applications, the Quaife ATB Helical LSD differential is second to none. Accept no imitations! 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 BC/IB5 is also now subject to a lifetime warranty (subject to terms and conditions). Please confirm your application using the attached techncial drawing.
Application:
- Ford Escort MK3 1.1/1.3/1.6/1.6D 1980-1985
- Ford Escort Mk3 1.6i/XR3i 1982-1985
- Ford Escort Mk3 RS Turbo Series 1 1984-1985
- Ford Escort Mk3 RS1600i 1981-1983
- Ford Escort Mk3 XR3 1980-1982
- Ford Escort Mk4 1.1/1.3/1.4/1.6/1.6D/1.8D 1986-1990
- Ford Escort Mk4 1.6i/XR3i 1986-1990
- Ford Escort Mk4 RS Turbo Series 2 1986-1990
- Ford Escort Mk5/6 1.3/1.4/1.6 1990-2001
- Ford Escort Mk5/6 1.6, 1.8 16v, XR3i (105PS) 1992-2001
- Ford Fiesta Mk1 1.0/1.1 1976-1983
- Ford Fiesta Mk1 1.3 Supersport 1980-1983
- Ford Fiesta Mk1 1.6 XR2 1981-1983
- Ford Fiesta Mk2 1.0/1.1/1.3/1.4/1.6D 1983-1989
- Ford Fiesta Mk2 1.6 XR2 1983-1989
- Ford Fiesta Mk3 1.0/1.1/1.3/1.4 & 1.6 1989-1995
- Ford Fiesta Mk3 Si 1.6, XR2i & RS1800 1.8 16v 1992-1995
- Ford Fiesta Mk3 XR2i 1.6 CVH 1989-1992
- Ford Fiesta Mk3 RS Turbo 1990-1992
- Ford Fiesta Mk4 1.25/1.3/1.4 1995-1999
- Ford Fiesta Mk5 1.25/1.3/1.4/1.6 2000-2002
- Ford Fiesta Mk6 1.25/1.3/1.4/1.6 2002-2008
- Ford Fiesta Mk6 1.4D/1.6D 2002-2008
- Ford Fiesta Mk6 ST150 2.0 2005-2008
- Ford Fiesta Mk7 (not ST180) 2008-2017
- Ford Focus Mk1 1.4/1.6/1.8 1998-2005
- Ford Focus Mk2 1.4/1.6/1.8 2005-2011
- Ford Focus Mk3 1.0/1.6 2011-
- Ford Ka Mk1 1996-2008
- Ford Mondeo Mk4 1.6 2007-2014
- Ford Orion Mk1 1.3/1.6/1.6D 1983-1985
- Ford Orion Mk2 1.4/1.6/1.6D/1.8D 1986-1990
- Ford Orion Mk3 1990-1993
- Ford Puma 1.4/1.6/1.7 1997-2001
- Ford Street Ka 2003-2005
Type BC Fiesta/Escort FWD Gearbox
4 and 5 speed FWD transaxle. Originally designed for the Fiesta Mk1 as a 4 speed gearbox, the 5 speed version was eventually introduced in 1982. It was fitted until 1995 in most FWD applications until being replaced by a similar more refined IB5 gearbox.
Oil capacity 4 speed: 2.8 litres
Oil capacity 5 speed: 3.1 litres
Standard oil grade: SAE80
Input spline: 20mm x 17
Type IB5 5 Speed FWD Gearbox
Current standard duty FWD transaxle which has been fitted since around 1995.
Oil capacity: 2.8 litres
Standard oil grade: 75W90 full-synthetic
Input spline: 20mm x 17