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Part number: QDF4Q
Product Details
Quaife QDF4Q ATB Differential
Products specifications
Position Rear
Position Front

The Quaife Differential powers both drive wheels under nearly all conditions, instead of just one. With an ordinary open differential, standard on most cars, a lot of precious power is wasted during wheelspin under acceleration. This happens because the open differential shifts power to the wheel with less grip (along the path of least resistance). The Quaife, however, does just the opposite. It senses which wheel has the better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel.

In drag-race style, straight-line acceleration runs, this results in a close to ideal 50/50 power split to both drive wheels, resulting in essentially twice the grip of an ordinary differential (they dont call open diffs peglegs for nothing).

In cornering, while accelerating out of a turn, the Quaife biases power to the outside wheel, reducing inside-wheel spin. This allows the driver to begin accelerating earlier, exiting the corner at a higher speed.

The Quaife also controls loss of traction when the front wheels are on slippery surfaces such as ice and snow or mud, providing the appropriate biased traction needed to overcome these adverse conditions. The Quaife Differential provides constant and infinitely variable drive. Power is transferred automatically without the use of normal friction pads or plates seen in other limited-slip designs.

The Quaifes unique design offers maximum traction, improves handling and steering, and puts the power where it is needed most. A definite advantage whether on the track or on the street.

The Quaife is extremely strong and durable and since the Quaife is gear operated, it has no plates or clutches that can wear out and need costly replacement.

The Quaife is great for street driving or racing. Racers dont have to put up with locking mechanisms or spools that created unwanted understeer under power, or in the case of front-drive cars, even tear the steering wheel out of their hands when cornering. Because it behaves like an open differential during ordinary driving, street drivers will have trouble telling its there until pushing the cars limits.

The Quaife has been proven in everything from SCCA Rally to Formula 1. It provides autocrossers with such an advantage, it has become required equipment for a winning effort.

More and more auto manufacturers are specifying the Quaife ATB Differential as original equipment in their high performance models for good reason it works!

Reviews
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H
Ordering was easy, over the phone or online i was able to find all my parts on Autoplicity conveniently and my order was shipped out in a timely manner. I had concerns that were tended to by a quick phone call and great customer services reps.
H
So far so good
K
great
E
Autoplicity has really good service. They give you such good prices and yet they're still willing to give you discounts on your purchases. They emailed me a day later after purchase with shipping number. I would recommend them to anyone!
Fitment
Audi 4000 Quattro
1987 Audi 4000 Quattro ALL / S
1986 Audi 4000 Quattro ALL / S
1985 Audi 4000 Quattro ALL / S
1984 Audi 4000 Quattro ALL / S
Audi A4
2000 Audi A4 ALL
1999 Audi A4 ALL
1998 Audi A4 ALL
1997 Audi A4 ALL
1996 Audi A4 ALL
Audi A4 Quattro
2000 Audi A4 Quattro ALL / Base
1999 Audi A4 Quattro ALL / Base
1998 Audi A4 Quattro ALL / Base
1997 Audi A4 Quattro ALL / Base
1996 Audi A4 Quattro ALL / Base
Audi Coupe
1987 Audi Coupe ALL / GT
1986 Audi Coupe ALL / GT
1985 Audi Coupe ALL / GT
1984 Audi Coupe ALL / GT
1983 Audi Coupe ALL / GT
Audi Coupe Quattro
1991 Audi Coupe Quattro 20v / ALL / Base
1990 Audi Coupe Quattro 20v / ALL / Base
Audi Quattro
1986 Audi Quattro ALL / Base
1985 Audi Quattro ALL / Base
1984 Audi Quattro ALL / Base
1983 Audi Quattro ALL / Base
Audi S4
2002 Audi S4 ALL / Avant / Base
2001 Audi S4 ALL / Avant / Base
2000 Audi S4 ALL / Avant / Base
Show All Vehicle Fitments
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