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Your Vehicle  //  Porsche  //  924 (1977-1988)  //  924S 2.5L 1988
Porsche924 (1977-1988)924S 2.5L 1988Gearbox / Transmission

Rear Differential

Rear Differential

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DISPLAYING 1 to 3 (of 3 products)
Differential output shaft seal. Porsche 924 / 944 / Boxster / Cayman - 016409399B
3
Differential output shaft seal. Porsche 924 / 944 / Boxster / Cayman
Special Order item
016409399B
Product Information
Product Information
Differential output shaft seal.

Fits:
For cars with manual transmission
Porsche 924 1976-88
Porsche 944 1982-91
Porsche 986 / 987 / 981 / 982 Boxster 1997>>
Porsche 987 / 981 / 982 Cayman 2005>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 4

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Related, superseded, cross reference or alternative numbers for comparison.

016409399B
016409399B

The product you are viewing cross references to these numbers
Differential output shaft seal. Porsche 924 / 944 / Boxster / Cayman 45 x 60 x 8mm - 016409399B, 314096090323, 016409399B, 15195, 190035410, 108768 - V103335
3
Differential output shaft seal. Porsche 924 / 944 / Boxster / Cayman 45 x 60 x 8mm
016409399B/1
Product Information
Product Information

OE Match differential output shaft seal for selected Porsche 924, 944, Boxster and Cayman manual-transmission applications. The supplied diagram specification is 45 x 60 x 8mm.

Fits
For cars with manual transmission

  • Porsche Boxster 986 2.5L 1997-99
  • Porsche Boxster 986 2.7L 1999-02
  • Porsche Boxster S 986 3.2L 1999-02
  • Porsche Boxster 986 2.7L 2003-04
  • Porsche Boxster S 986 3.2L 2003-04
  • Porsche Boxster 987 2.7L 2005-08/08
  • Porsche Boxster 987 S 3.2/3.4L 2005-08/08
  • Porsche 944 2.5L 8V 1982-87
  • Porsche 944 2.7L 8V 1988-89
  • Porsche 944S 2.5L 16V 1987-88
  • Porsche 944S2 3.0L 16V 1989-91
  • Porsche 944 Turbo 2.5L 8V 1985-88
  • Porsche 944 Turbo 2.5L 8V 1989-91
  • Porsche 944 Turbo S 2.5L 8V 1988
  • Porsche Cayman S 3.4L 987C 2005-08
  • Porsche Cayman 2.7L 987C 2006-08
  • Porsche 924 2.0L 1976-79
  • Porsche 924 2.0L 1980-85
  • Porsche 924 Turbo 2.0L 1979-81
  • Porsche 924 Turbo 2.0L 1982-84
  • Porsche 924 Carrera GT 2.0L 1981
  • Porsche 924 Carrera GTS 2.0L 1982
  • Porsche 924S 2.5L 1986-87
  • Porsche 924S 2.5L 1988
  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Cayman 718 2.0L Manual (300 Bhp)
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L Manual (350 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Cayman T 718 2.0L Manual (300 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)


Diagram Ref No 4


What This Product Does
This radial seal retains lubricant where the differential output shaft passes through its housing, forming a sealing interface around the rotating shaft.


Functions

  • Limits lubricant escape at the differential output.
  • Seals the interface between the shaft and housing.


Technical Details

  • Part reference: 016409399B; radial shaft seal, 45 x 60 x 8mm.
  • 986 Boxster diagram applications: G86.00 M481 five-speed manual, 1997–04; differential G86.00/01, 1997–04.
  • 987 Boxster diagram applications: G87.01 I481 five-speed manual, 2005–08; Boxster S G87.20 I480 six-speed manual, 2007–08.
  • 987C.1 Cayman diagram applications: G8701+ PR:481 five-speed manual, 2.7L 2006–08; differential application, 2.7L 2007–08.
  • 987C.1 Cayman six-speed manual diagram application: G8720,G8721+ PR:480, 2006–08.
  • Specified diagram quantities: two seals in the 986 and 987 differential assemblies and the listed 987 Boxster S and 987C.1 six-speed transmission assemblies. This is an assembly requirement, not a statement of pack contents.


Symptoms of Fault

  • Oily deposits around the differential output flange.
  • Lubricant seepage or drops beneath the transmission.
  • A recurring leak associated with a hardened or damaged seal.


Why Replacement Matters

Renewing a leaking output seal addresses lubricant loss at this location. Inspect the shaft sealing surface and surrounding components during the repair, as damage or wear elsewhere can contribute to repeat leakage.


FAQs

  • Will this seal resolve every transmission leak?
    No. Establish where the lubricant is escaping before selecting a replacement.
  • Should sealant be added?
    Use additional sealing compounds only when required by the relevant workshop procedure.
  • Does a matching model name confirm compatibility?
    No. Cross-check reference 016409399B, the gearbox identification and the manual-transmission restriction before fitting.


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

016409399B
016409399B
314096090323
016409399B
15195
190035410
108768

The product you are viewing cross references to these numbers
Roller Bearing Porsche 924 / 944
4
Roller Bearing Porsche 924 / 944
Special Order item
016409123
Product Information
Product Information
Roller Bearing Porsche 924 / 944

Fits:

  • 924S with 5-speed manual transmission
  • 944 with 5-speed manual transmission
  • 924 4-speed manual transmission with gearbox 0886/088A
  • 924 1981-85 5-speed manual transmission with gearbox type 0168 (gear number VQ / MD)
  • 924 1981-85 5-speed manual transmission with gearbox type 0169 (gear number VR / UV / ME / MF)
  • 924 1981-85 5-speed manual transmission with gearbox type 016G (gear number MB / MX)

Diagram ref no 2
DISPLAYING 1 to 3 (of 3 products)
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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