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Rear Differential

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DISPLAYING 17 to 29 (of 29 products)
1 2
40309165WK
Product Information
Product Information
Wavetrac® Differential.

wavetrac

FITS:
Porsche 996 C2 1998-2005 6-Speed Manual
(Excl 996 C4, 996 Turbo)
Porsche 986 Boxster S 3.2L 6-Speed Manual

◾ Innovative:
Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing diff design.

◾ Superior Materials:
9310 steel gears run in case-hardened billet or forged steel bodies. ARP® fasteners used throughout.

◾ Maintenance Free:
As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds.

◾ Customizable:
If desired, you can alter the diff's behavior to suit your needs using optional components.

◾ Limited LIFETIME Warranty:
All Wavetrac® differentials include a transferable, Limited Lifetime Warranty.

For More information Click Here

Please note: This is a special order part and usually takes between 2-6 weeks to come into stock.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

40309165WK
40.309.165WK
40309165WK

The product you are viewing cross references to these numbers
QDF6Q
Product Information
Product Information
Automatic Torque Biasing Differential enables your car to accelerate quicker and corner faster.

quaife

Fits:
Porsche Boxster 2.5L 5 SPEED

For Technical Specifications Click Here
Quaife ATB Helical LSD differential for Porsche Boxter is suitable for Porsche Boxter models with 2.5 litre engine, model years 1996-98 only. A direct replacement for the standard Porsche differential, the Quaife ATB Helical LSD differential transforms your car’s performance.

Unlike a conventional plate-style limited slip differential, the Porsche Boxter Quaife ATB Helical LSD differential relies on gears rather than clutch plates for its operation. That means it is much smoother in operation.

The Porsche Boxter 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 Porsche Boxter 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 Porsche Boxter 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 Porsche Boxter 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.
Special Offer
QDF7Q
Product Information
Product Information
Automatic Torque Biasing Differential enables your car to accelerate quicker and corner faster.

Push in flange type


Fits:
Porsche 996 3.6L / 3.4L C2/C4/C4S*
Porsche Boxster 986 3.2L S 6 SPEED
Porsche Boxster 987 3.2L S 6 SPEED
*small percentage of cars have bolt on flanges and require differential QDF14Q 

For Technical Specifications Click Here

The Differential powers both drive wheels under nearly all conditions. With an ordinary open differential (standard on most cars), precious power is wasted during wheel spin under acceleration. This happens because the open differential shifts power to the wheel with less grip, along the path of least resistance. The Differential, however, does just the opposite. It senses which wheel has 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.

Differential 20-80%
Manual cars only

Special Offer
QDF15Q
Product Information
Product Information
Automatic Torque Biasing Differential enables your car to accelerate quicker and corner faster.

quaife

Fits:
Porsche Cayman & S, Boxter 986/987 (Tiptronic)

For Technical Specifications Click Here

Quaife ATB Helical LSD differential is for a variety of models including Porsche Cayman & S, Boxter 986/987 (Tiptronic). A direct replacement for the standard open differential, the Quaife ATB Helical LSD differential transforms your car's performance. Unlike a conventional plate-style limited slip differential, the 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 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 wheel spin, 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 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 250 applications - the Quaife ATB Helical LSD differential is the best option to utilise your cars performance. Quaife ATB Helical LSD differentials are used by Ford, General Motors and Daimler-Chrysler as original equipment. The Quaife ATB Helical LSD differential is also now subject to a lifetime warranty (subject to terms and conditions). This product is available direct from QUAIFE; please confirm your application using the attached technical drawing.
Special Offer
QDF12Q
Product Information
Product Information
Automatic Torque Biasing Differential enables your car to accelerate quicker and corner faster.

quaife

Fits:
Porsche Cayman S 987C
Porsche Boxster S 987 3.4L

For Technical Specifications Click Here

Quaife ATB Helical LSD differential for Porsche Cayman S is suitable for Porsche Cayman S models, to replace the standard open differential. A direct replacement for the standard Porsche differential, the Quaife ATB Helical LSD differential transforms your car's performance.

Unlike a conventional plate-style limited slip differential, the Porsche Cayman S Quaife ATB Helical LSD differential relies on gears rather than clutch plates for its operation. That means it is much smoother in operation.

The Porsche Cayman S 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 Porsche Cayman S 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 Porsche Cayman S 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 Porsche Cayman S 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.
Special Offer
QDF16Q
Product Information
Product Information
Automatic Torque Biasing Differential enables your car to accelerate quicker and corner faster.

quaife

Fits:
Porsche Boxster 986 and Cayman 987 2.7L models using the 5-speed Audi 01X gearbox

For Technical Specifications Click Here

Quaife ATB Helical LSD differential suitable for various Porsche models, including Boxster 986 and Cayman 987 2.7L models using the 5-speed Audi 01X gearbox.

A direct replacement for the standard Porsche differential, the Quaife ATB differential transforms your car's performance.

Unlike a conventional plate-style limited slip differential, the Porsche Boxster S 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 differential never locks harshly with a set pre-load of wheel slip across the driven axle, like a conventional LSD. Rather, it automatically biases the torque away from the spinning wheel across the axle, to a constantly varying degree, and never locks.

The ATB 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 ATB 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 differential is second to none. Accept no imitations!

Quaife ATB differentials are used by Ford, General Motors and Daimler-Chrysler as original equipment.

The ATB differential for is also now subject to a lifetime warranty (subject to terms and conditions).

Please confirm your application using the attached techncial drawing.
40309176WK
Product Information
Product Information
Wavetrac® Differential.

wavetrac

FITS:
Porsche 981 Cayman S (3.4L) 6-Speed Manual 2014>>
Porsche 981 Boxster S (3.4L) 6-Speed Manual 2014>>

• Innovative:
Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing diff design.

• Superior Materials:
9310 steel gears run in case-hardened billet or forged steel bodies. ARP® fasteners used throughout.

• Maintenance Free:
As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds.

• Customizable:
If desired, you can alter the diff's behavior to suit your needs using optional components.

• Limited LIFETIME Warranty:
All Wavetrac® differentials include a transferable, Limited Lifetime Warranty.

For More information Click Here

Please note: This is a special order part and usually takes between 2-6 weeks to come into stock.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

40309176WK
40309176WK
40 309 176WK

The product you are viewing cross references to these numbers
40309175WK
Product Information
Product Information
Wavetrac® Differential.

wavetrac

FITS:
Porsche 987 Cayman S 6-Speed Manual
Porsche 987 Boxster S 6-Speed Manual

• Innovative:
Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing diff design.

• Superior Materials:
9310 steel gears run in case-hardened billet or forged steel bodies. ARP® fasteners used throughout.

• Maintenance Free:
As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds.

• Customizable:
If desired, you can alter the diff's behavior to suit your needs using optional components.

• Limited LIFETIME Warranty:
All Wavetrac® differentials include a transferable, Limited Lifetime Warranty.

For More information Click Here

Please note: This is a special order part and usually takes between 2-6 weeks to come into stock.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

40309175WK
40.309.175WK
40309175WK

The product you are viewing cross references to these numbers
40309187WK
Product Information
Product Information
Wavetrac® Differential.

wavetrac

FITS:
Porsche 987 Cayman S 3.4L PDK
Porsche 987 Boxster S 3.4L PDK
Porsche 981 Cayman S 3.4L PDK
Porsche 981 Boxster S 3.4L PDK
Porsche 997.2 PDK with Open Differential
Porsche 991/991.2 PDK with Open Differential
Porsche 718 (G91) PDK with Open Differential

◾ Innovative:
Patented Wavetrac® design automatically improves grip in low traction conditions. This feature is truly innovative and unlike any other torque biasing diff design.

◾ Superior Materials:
9310 steel gears run in case-hardened billet or forged steel bodies. ARP® fasteners used throughout.

◾ Maintenance Free:
As supplied new, the Wavetrac® differential will perform a lifetime of service without maintenance or rebuilds.

◾ Customizable:
If desired, you can alter the diff's behavior to suit your needs using optional components.

◾ Limited LIFETIME Warranty:
All Wavetrac® differentials include a transferable, Limited Lifetime Warranty.

For More information Click Here

Please note: This is a special order part and usually takes between 2-6 weeks to come into stock.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

40309187WK
40.309.187WK
40309187WK

The product you are viewing cross references to these numbers
Special Order item
90030903801
Product Information
Product Information
Pin, 5x16, for fixing the bolt of the pinion gears in the differential.

porsche

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 996 Carrera 1998 - 2005

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90030903801
90030903801

The product you are viewing cross references to these numbers
Special Order item
98639702700
Product Information
Product Information

Oil seal for the short differential output shaft, located on the side of the gearbox with the differential cover. 

Outer Diameter: 90mm. 

Fits:
Vehicles With Tiptronic Transmission (PR 249)
Porsche 986 Boxster 1997-04

Porsche 987-1 Boxster 2005-08 
Porsche 987-1 Cayman 2006-08

Diagram ref. 3.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

98639702700
98639702700

The product you are viewing cross references to these numbers
Special Order item
99639701500
Product Information
Product Information
Oil Seal For The Long Differential Output Shaft Flange, Located On The Side Of The Gearbox Without The Differential Cover Plate. 

Outer Diameter: 54mm. 

Fits:
Vehicles With Tiptronic Transmission (PR 249)
Porsche 986 Boxster 1997>>2004

Porsche 987.1 Boxster MKI 2005>>2008
Porsche 987.1 Cayman 2006>>2008

Porsche 996 Carrera 3.4L 1998>>2001

Diagram Ref No 3

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99639701500
99639701500

The product you are viewing cross references to these numbers
Special Order item
996302122
Product Information
Product Information
Replacement shim for pinion / lay shaft - gearbox to differential.

porsche

Fits:
Porsche 986 Boxster / S 1999-04*
Porsche 996 Carrera 1998-05*

*Only for models with the six-speed manual transmission.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

996302122
99630212200
99630212201
99630212202
99630212203
99630212204
99630212205
99630212206
99630212207
99630212208
99630212209
99630212210
99630212211
99630212212
99630212213
99630212214
99630212215
99630212216
99630212217
99630212218
99630212219
99630212220
99630212221
99630212222

The product you are viewing cross references to these numbers
DISPLAYING 17 to 29 (of 29 products)
1 2
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About Rear Differential

Porsche Rear Differentials | Precision Power Distribution for Maximum Traction and Performance

The rear differential is one of the most critical components in your Porsche’s drivetrain. It transfers engine power from the transmission to the rear wheels while allowing them to rotate at different speeds during cornering. This ensures balanced handling, traction, and stability — essential for Porsche’s trademark driving dynamics.

At Design911, we supply high-quality rear differentials and differential components engineered to meet or exceed original performance standards. Built from precision-machined gears, hardened steel housings, and performance-grade bearings, each unit ensures smooth torque distribution and dependable strength under demanding conditions.

Whether you’re maintaining a daily driver or upgrading for track use, our Porsche rear differential parts deliver improved traction, cornering precision, and long-term reliability.

What Does the Rear Differential Do?

The rear differential balances rotational speed between the rear wheels while transmitting power from the gearbox to the axles.

Core Functions:

  • Distributes torque evenly between rear wheels.
  • Allows independent wheel rotation during turns.
  • Prevents wheel slip and loss of traction.
  • Reduces drivetrain stress and enhances stability.
  • Supports optimal cornering control and handling balance.

Without a properly functioning differential, your Porsche may experience wheel spin, vibrations, or loss of power transfer — reducing both performance and safety.

Why Do Rear Differentials Fail or Wear Out?

Over time, continuous stress, torque, and heat exposure can cause differential components to wear, leading to poor lubrication and gear damage.

Common Causes of Failure Include:

  • Low or contaminated differential oil causing friction and overheating.
  • Bearing wear leading to excessive noise or vibration.
  • Gear tooth pitting or chipping from torque overload.
  • Seal failure causing oil leaks.
  • Corrosion or fatigue from moisture intrusion.

Signs of a failing differential include whining noises, clunking on acceleration, fluid leaks, or uneven tyre wear.

Why Replace or Upgrade Your Porsche Rear Differential?

Replacing a worn or damaged differential restores power delivery, traction, and drivetrain balance. Upgrading to a performance-spec or limited-slip differential (LSD) enhances handling and control — ideal for spirited road or track driving.

Key Benefits:

  • Restores smooth, balanced power distribution.
  • Eliminates noise, vibration, and gear chatter.
  • Improves traction and acceleration out of corners.
  • Extends drivetrain longevity through precise engineering.
  • Suitable for Porsche 911, Cayman, Boxster, Panamera, and classic models.
  • Available in performance or standard specifications.

Replacing the differential during gearbox or axle servicing ensures long-term reliability and optimum drivetrain efficiency.

Highlights

  • Premium Porsche rear differentials and components.
  • Precision-engineered for torque balance and durability.
  • High-strength materials for road, race, or restoration builds.
  • Reduces noise, vibration, and harshness (NVH).
  • Ideal for upgrades, rebuilds, or performance applications.
  • Compatible with manual, Tiptronic, and PDK systems.       

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