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Quaife A.T.B. Differential Mercedes-Benz E55 E63 C63 CLS55 CLS63



Model #QDF9V1

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The Quaife torque biasing differential enables your car to accelerate quicker and corner faster. 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.

The Quaife’s 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 don’t 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 it’s there until pushing the car’s limits.


08-10 C63
07-10 CLS63
03-06 E55
07-10 E63

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Vehicle Engine Notes
Mercedes-Benz C63 AMG

Mercedes-Benz C63 S AMG

Mercedes-Benz CL63 AMG

Mercedes-Benz CLS55 AMG

Mercedes-Benz CLS63 AMG

Mercedes-Benz E55 AMG

Mercedes-Benz E63 AMG

Quaife warrants that the Products will at the time of delivery and for 6 months afterwards correspond to the Specification set out in the Order Acknowledgement.

If the Products qualify for the Lifetime Warranty as indicated on the Website and the Buyer has activated the Lifetime Warranty as instructed on the Website, the terms of the Lifetime Warranty will apply to such qualifying Products.

Quaife fails to comply with these Conditions, it will only be responsible for loss or damage the Buyer suffers that is a foreseeable result of Quaife's breach of these Conditions. Quaife is not responsible for any loss or damage that is not foreseeable. Loss or damage is foreseeable if either it is obvious that it will happen or if, at the time the contract was made, both the Buyer and Quaife knew it might happen. The Buyer must also take reasonable steps to reduce the effect of any loss or damage it may suffer.

Quaife does not exclude or limit in any way its liability where it would be unlawful to do so. This includes liability for death or personal injury caused by its negligence or the negligence of its employees, agents or subcontractors; or for fraud or fraudulent misrepresentation.

In the absence of any fraudulent misrepresentation by Quaife, Quaife shall not be liable at all to Buyer for any indirect loss and/or expense (including loss of profit) suffered by Buyer arising from Quaife's breach of contract.

Quaife shall not be liable for the Products' failure to comply with the warranty set out in clause 4.1 if:
  • the Buyer makes further use of such Products after a defect or failure became apparent, or ought to have become apparent, to the Buyer;
  • the defect arises because the Buyer failed to follow Quaife's oral or written instructions or recommendations as to the storage, installation, commissioning, use, operation or maintenance or servicing of the Product;
  • the defect arises due to the location of the Product decided by the Buyer, or the effects of frost, heat or inclement weather;
  • the Buyer alters, disassembles, reconfigures or repairs the Product or installs or uses them in any vehicle not specified by Quaife, without the prior written consent of Quaife;
  • the defect arises as a result of fair wear and tear (including during high performance use), or accidental damage, or wilful damage, negligence, or abnormal working conditions; or
  • the Quaife-stamped part number of the Product has been tampered with or removed.

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