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Porsche 911 & 912 (1965-1989) 911 1975-1977 3.0L Turbo (930) Gearbox / Transmission

Gasket Sets / Gaskets / Seals / Lock Nuts

Gasket Sets / Gaskets / Seals / Lock Nuts

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DISPLAYING 1 to 13 (of 13 products)
Driveshaft gasket. Porsche 911 turbo / 928 / 928S - 93033229700 - PDATW
2
Driveshaft gasket. Porsche 911 turbo / 928 / 928S
93033229700/1
Product Information
Product Information

Driveshaft Gasket – Transmission / Flange Seal 
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High-quality replacement driveshaft gasket 

Fits:

  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 911 1978-1986 3.3L Turbo (930)
  • Porsche 928 4.5L 1978-82
  • Porsche 928S 4.7L 1981-83

Diagram ref no 19

This gasket provides a secure seal at the driveshaft flange connection, helping to prevent oil leaks and maintain proper sealing within the drivetrain system. It is a critical component for ensuring reliable transmission performance and long-term durability.

Manufactured to OEM specifications, this gasket offers precise fitment and dependable sealing performance—ideal for maintenance, repair, or restoration of classic Porsche models.

Key Features

• Direct replacement driveshaft gasket
• Suitable for Porsche 911 Turbo and 928 / 928S models
• Ensures proper sealing at drivetrain flange connection
• OEM-style fit and sealing performance
• Durable material for long-term reliability
• Ideal for repair, servicing, or restoration

Function and Purpose

This gasket seals the driveshaft connection at the transmission or flange interface.

It helps to:

• Prevent transmission oil leaks
• Maintain proper lubrication within drivetrain components
• Protect against contamination
• Support smooth drivetrain operation

Why Replace Your Driveshaft Gasket

Over time, drivetrain gaskets can degrade due to heat, pressure, and oil exposure.

Common issues include:

• Oil leaks at driveshaft or flange connections
• Hardened or damaged gasket material
• Reduced sealing performance
• Risk of drivetrain wear due to fluid loss

Replacing the gasket restores proper sealing and drivetrain reliability.



Related reference numbers
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93033229700
93033229700

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Gearbox gasket set. Porsche 911 Turbo 1975-89 - 93030091100, 285.383
1
Gearbox gasket set. Porsche 911 Turbo 1975-89
Special Order item
93030091100
Product Information
Product Information
Porsche 930 4 speed gearbox gasket set.
Set of gaskets & seals for gearbox overhaul.



Fits:
Porsche 911 Turbo 4-speed 1975-89

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

93030091100
93030091100
285.383

The product you are viewing cross references to these numbers
Gearbox gasket set. Porsche 911 Turbo 1975-89 - 93030091100, 285.383
1
Gearbox gasket set. Porsche 911 Turbo 1975-89
93030091100/1
Product Information
Product Information
Porsche 930 4 speed gearbox gasket set.
Set of gaskets & seals for gearbox overhaul.



Fits:
Porsche 911 Turbo 4-speed 1975-89

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

93030091100
93030091100
285.383

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Gearshift Rod Cover Gasket. Porsche 911 72-89 - 91530322500
4
Gearshift Rod Cover Gasket. Porsche 911 72-89
Special Order item
91530322500
Product Information
Product Information
Gearshift Rod 3RD / 4TH Gear.



Fits
Porsche 911 1972-86
Porsche 911 (930) Turbo 1975-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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91530322500
91530322500

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Oil seal for gear selector shaft. Porsche 911 / 912 - 99911318540, 90011200150, 037.133 - 1632100100
2
Oil seal for gear selector shaft. Porsche 911 / 912
99911318540/1
Product Information
Product Information

Gear Selector Shaft Oil Seal

OE Match gear selector shaft oil seal for classic Porsche 911 and 912 manual gearboxes. Designed to replace a worn or leaking original seal, this component helps prevent transmission oil from escaping around the gear selector shaft where it passes through the gearbox housing.

Fits:
Porsche 911 1965-1968 2.0L / 912 SWB (F)                               
Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Porsche 912E 4CYL 1976

Diagram ref no 8

The seal provides a barrier between the moving selector shaft and gearbox casing, helping retain the correct transmission oil level and protecting the surrounding components from oil contamination.

What Does the Gear Selector Shaft Oil Seal Do?

The gear selector shaft transfers movement from the gear lever linkage into the gearbox, allowing the driver to select different gears.

The oil seal fits around this shaft and prevents gearbox oil from escaping while allowing the shaft to move during gear changes. A properly functioning seal helps maintain the transmission oil level and keeps the gearbox exterior clean and dry.

Why Does It Fail?

Over time, the sealing material can harden, shrink or lose flexibility due to age, heat and prolonged contact with transmission oil.

Common causes of failure include:

  • Age-related deterioration of the sealing lip
  • Hardened or cracked rubber
  • Wear from repeated selector shaft movement
  • Corrosion or damage to the shaft sealing surface
  • Incorrect installation or previous gearbox repairs
  • Excessive shaft movement or wear

As the seal deteriorates, transmission oil may begin to seep around the selector shaft.

When Should It Be Replaced?

A replacement may be required if you notice:

  • Gearbox oil leaking around the selector shaft
  • Oil collecting on the underside of the transmission
  • Drips beneath the gearbox
  • A persistent oily residue around the selector linkage
  • A damaged or hardened seal during gearbox servicing

The seal should also be inspected whenever the gearbox selector mechanism is dismantled or the transmission is removed for restoration.

Checks During Replacement

Before fitting a new oil seal, inspect the selector shaft for corrosion, scoring or excessive movement. Check the gearbox breather and surrounding seals to ensure the leak has been correctly identified.

The new seal should be installed squarely and to the correct depth, without damaging the sealing lip or shaft surface.

Porsche 911 / 912 Gearbox Oil Seals & Transmission Components

Gearbox oil seals are essential for maintaining the correct lubrication of classic Porsche manual transmissions. The gear selector shaft oil seal prevents transmission oil from leaking where the selector shaft enters the gearbox housing.

On older Porsche 911 and 912 models, ageing seals can become brittle or worn, allowing gearbox oil to escape. Replacing a leaking seal helps protect the transmission against lubricant loss and prevents oil contamination around the gear linkage and gearbox casing.

OE Match seal is a 15 × 24 × 7 mm replacement selector shaft oil seal for selected Porsche 911, 912 and 930 Turbo manual gearboxes. It is particularly suitable for maintenance and restoration of classic Porsche transmissions. 



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

99911318540
99911318540
90011200150
037.133

The product you are viewing cross references to these numbers
Oil seal for gear shifter by the gearbox housing. Porsche 911 / 912 - 99911318540, 90011200150, 037.133
2
Oil seal for gear shifter by the gearbox housing. Porsche 911 / 912
Special Order item
99911318540::1
Product Information
Product Information
Oil seal for the shifter shaft at the rear of the gearbox case. 15 X 24 X 7 mm



Fits:
Porsche 911 1965-1986 (not for G50 transmission)

Porsche 930 Turbo 1975-89
Porsche 911 (930) Turbo 1975-1989

Click 'Zoom in' for large parts diagram.
Diagram ref no 8



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

99911318540
99911318540
90011200150
037.133

The product you are viewing cross references to these numbers
Radial shaft oil seal gearbox. Porsche 911 turbo 1975 - 1989 - 93030233200, 93030233201
4
Radial shaft oil seal gearbox. Porsche 911 turbo 1975 - 1989
Special Order item
93030233201
Product Information
Product Information
Radial shaft oil seal - gearbox. 



Fits:
Porsche 911 turbo 3.0ltr - 1975 to 1977
Porsche 911 turbo 3.3ltr - 1978 to 1988

Click 'Zoom in' for large parts diagram.
Diagram ref no. 26



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

93030233201
93030233200
93030233201

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Radial shaft seal. Porsche 911 / 914 / 924 - 99911318340, 99911325840, 089.567, PCG113183A, 99911313050, 99911320240
3
Radial shaft seal. Porsche 911 / 914 / 924
Special Order item
PCG113183A
Product Information
Product Information
Radial shaft seal. 45 x 68 x 10 mm.



Fits:
Porsche 911 1972-86
Porsche 930 Turbo 1975-89
Porsche 914-6 1970-76
Porsche 924 Carrera GT 1981
Porsche 924 Turbo 1979-84

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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

PCG113183A
99911318340
99911325840
089.567
PCG113183A
99911313050
99911320240

The product you are viewing cross references to these numbers
Radial shaft seal. Porsche 911 / 914 / 924 - 99911318340, 99911325840, 089.567, PCG113183A, 99911313050, 99911320240
3
Radial shaft seal. Porsche 911 / 914 / 924
PCG113183A/1
Product Information
Product Information
Radial shaft seal. 45 x 68 x 10 mm.



Fits:
Porsche 911 1972-86
Porsche 930 Turbo 1975-89
Porsche 914-6 1970-76
Porsche 924 Carrera GT 1981
Porsche 924 Turbo 1979-84

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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

PCG113183A
99911318340
99911325840
089.567
PCG113183A
99911313050
99911320240

The product you are viewing cross references to these numbers
Roll pin. Porsche 911 1970-89 - 90030900500
2
Roll pin. Porsche 911 1970-89
Special Order item
90030900500
Product Information
Product Information
Pin 4 X 26 For Transmission Gear



Fits:
Porsche 911 1970-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 26

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90030900500
90030900500

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Transmission case lid seal. Porsche 911 / 912 / 930 / 924 / 944 / 914 - 113301185A, 783.250
2
Transmission case lid seal. Porsche 911 / 912 / 930 / 924 / 944 / 914
Special Order item
113301185A
Product Information
Product Information
Transmission case lid seal.



Fits:
For cars with Manual transmission
Porsche 911/912 1969-73
Porsche 930 1975-77
Porsche 924 1976-85
Porsche 944 1982-91
Porsche 914 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

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

113301185A
113301185A
783.250

The product you are viewing cross references to these numbers
Transmission case lid seal. Porsche 911 / 912 / 930 / 924 / 944 / 914 - 113301185A, 783.250
2
Transmission case lid seal. Porsche 911 / 912 / 930 / 924 / 944 / 914
113301185A/1
Product Information
Product Information
Transmission case lid seal.



Fits:
For cars with Manual transmission
Porsche 911/912 1969-73
Porsche 930 1975-77
Porsche 924 1976-85
Porsche 944 1982-91
Porsche 914 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

Related reference numbers
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113301185A
113301185A
783.250

The product you are viewing cross references to these numbers
Transmission front cover to gear housing gasket. Porsche 911 Turbo 1976-88 - 93030135100
2
Transmission front cover to gear housing gasket. Porsche 911 Turbo 1976-88
Special Order item
93030135100
Product Information
Product Information
Transmission front cover to gear housing gasket.



Fits:
Porsche 930 Turbo 1975-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 35

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

93030135100
93030135100

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DISPLAYING 1 to 13 (of 13 products)
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About Gasket Sets / Gaskets / Seals / Lock Nuts

Porsche Gearbox & Transmission Gasket Sets, Gaskets, Seals & Lock Nuts | Precision Sealing for Drivetrain Integrity

Gaskets, seals, and lock nuts are essential components that protect your Porsche’s gearbox or transmission system from fluid leaks, contamination, and vibration. These parts maintain internal pressure, ensure proper lubrication, and secure vital fasteners under extreme temperature and torque conditions — all of which are crucial for reliable, long-term gearbox performance.

At Design911, we supply premium gearbox gasket sets, individual seals, and locking hardware engineered to match or exceed original performance specifications. Manufactured from advanced composite, rubber, and metal-reinforced materials, our gasket kits ensure a perfect fit and dependable sealing across all Porsche models.

Whether you’re performing a gearbox rebuild, addressing a transmission leak, or refreshing driveline components, our gaskets, seals, and lock nuts deliver precision, reliability, and protection against future wear or oil loss.

What Do Gearbox Gaskets, Seals & Lock Nuts Do?

Each component plays a vital role in maintaining your Porsche’s gearbox integrity and smooth power delivery.

Core Functions:

  • Gaskets: Create a reliable seal between mating gearbox surfaces to prevent oil leaks.       
  • Seals: Prevent lubricant loss around rotating shafts and input/output housings.
  • Lock Nuts & Fasteners: Secure transmission components under high vibration and torque loads.

Together, they preserve internal oil pressure, reduce wear on moving parts, and ensure consistent transmission performance in both road and track conditions.

Why Do Gearbox Gaskets, Seals & Lock Nuts Fail or Wear Out?

Over time, these components endure significant thermal cycling, pressure changes, and exposure to fluids. Age and wear lead to material degradation and potential leaks.

Common Causes of Failure Include:

  • Gasket shrinkage, cracking, or compression fatigue.
  • Seal hardening from heat or exposure to aggressive fluids.
  • Damaged or corroded sealing surfaces during service.
  • Lock nuts loosening due to vibration or over-torqueing.
  • Improper installation or reusing old sealing materials.

Failure of any of these parts can result in oil leaks, gearbox noise, or internal component damage — all of which compromise drivetrain performance and reliability.

Why Replace Your Porsche Gearbox Gaskets, Seals & Lock Nuts?

Replacing worn or leaking gaskets and seals prevents oil loss and transmission failure, while fresh locking hardware ensures secure, vibration-proof assembly. During any gearbox or differential service, new gaskets and seals should always be installed to guarantee long-term reliability.

Key Benefits:

  • Prevents oil leaks and contamination of internal components.
  • Maintains gearbox pressure and correct lubrication levels.
  • Reduces noise, vibration, and harshness (NVH).
  • Protects against long-term wear and gear damage.
  • Precision fitment for Porsche manual, automatic, and PDK systems.
  • Ideal for gearbox rebuilds, maintenance, and performance upgrades.

Replacing these parts as a complete kit ensures every sealing point and fastener is restored to optimal condition — protecting your investment and performance.

Highlights

  • Complete Porsche gearbox gasket sets, seals, and lock nut kits.
  • Manufactured from high-quality materials for strength and longevity.
  • Designed for perfect fitment and superior oil retention.
  • Resistant to heat, pressure, and transmission fluid degradation.
  • Suitable for Porsche 911, Cayman, Boxster, Panamera, and more.
  • Essential for gearbox servicing, rebuilds, and leak prevention.       

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