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Porsche 911 & 912 (1965-1989) Gearbox / Transmission Gearbox Parts

Gearbox Casing / Casing Parts

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3 3 3

Main shaft seal. Porsche 911 1972-86

99911318241/1

Product Information

Main shaft seal, 23 x 40 x 10.

Fits:
Porsche 911 1972-73 (TYP 915) upto:
G >> 733 7374
G >> 723 0507
G >> 783 0830
Porsche 911 Carrera 1974-86

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Diagram ref no 13

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Related, superseded, cross reference or alternative numbers for comparison.

99911318241

99911318240

089.575

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Main shaft seal. Porsche 911/912 1972-86

99911332740

Product Information

Main shaft seal

Fits:
Porsche 911 1972-73 (TYP 915) from:
G 733 7575 >>
G 723 0507 >>
G 783 0838 >>
Porsche 911 Carrera 1973-86

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Diagram ref no 13

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Related, superseded, cross reference or alternative numbers for comparison.

99911332740

99911332740

91530238100

99911328340

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3 3 3

Main shaft seal. Porsche 911/912 1972-86

99911332740/1

Product Information

Main shaft seal, 23 x 35 x 8/11.
A rubber shaft oil seal (radial seal) for the main/input shaft of a 901/915-series gearbox. It fits around the rotating shaft and seals the interface between the rotating shaft and the gearbox housing to prevent gearbox oil leaks.
Dimensions: 23 mm (shaft diameter) × 35 mm (outer diameter) × 8/11 mm thickness (seal housing/dual-lip design).

Fits:
Porsche 911 1972 - 1973 (TYP 915) from:
G 733 7575 >>
G 723 0507 >>
G 783 0838 >>
Porsche 911 Carrera 1973 - 1986

Diagram ref no 11

This seal prevents gearbox oil from escaping around the input or main shaft, ensuring the transmission remains properly lubricated. It also blocks dirt, water, and other contaminants from entering the gearbox, helping preserve internal components and maintain correct operating pressure. By replacing a worn, hardened, or cracked original seal, it restores a clean, leak-tight barrier for reliable long-term gearbox performance.

Original gearbox seals degrade over time: rubber lips harden or crack, springs lose tension, and sealing surfaces wear. A failing main-shaft seal typically leads to:
• Gearbox oil leaks
• Loss of gearbox oil over time (low oil level)
• Contamination ingress (dirt, water), leading to accelerated gearbox wear or internal damage
• Messy drip underneath the car and gearbox housing

Replacing the seal with a correct-spec new unit restores proper sealing, preserves gearbox oil integrity, and helps prevent costly internal damage or gearbox failure.

You should replace this seal if:
• Gearbox oil leaks are visible around the input shaft or bellhousing area
• There is seepage, oil dripping, or a film of oil on the underside of gearbox or clutch area
• The old seal appears cracked, hardened, or visibly damaged
• You are doing a gearbox rebuild, overhaul or maintenance
• You notice loss of gearbox oil or suspect contamination ingress

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

99911332740

99911332740

91530238100

99911328340

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3 3 3

Manual transmission main shaft seal. Porsche 911 / 964 / 993 / 996 / 997

99911332641

Product Information

Manual transmission main shaft seal. 26.5 x 40 mm

Fits:
Porsche 911 Carrera / Turbo 1987-89
Porsche 964 Carrera / Turbo 1989-94
Porsche 993 Carrera / Turbo 1995-98
Porsche 996 Turbo / GT2 / GT3 2001-05
Porsche 997.1 Turbo / GT2 2007-09
Porsche 997.2 Turbo / GT2 2010-13
Porsche 996 GT3 1999-05
Porsche 997 GT3 2007-11

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Diagram ref no 12

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

99911332641

99911332641

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3 3 3

Manual transmission main shaft seal. Porsche 911 / 964 / 993 / 996 / 997

99911332641/1

Product Information

Manual transmission main shaft seal. 26.5 x 40 mm.
Its function is to act as a primary seal to retain oil around the input (main) shaft of a manual transmission, preventing fluid leaks and protecting driveline components.

Fits:
Porsche 911 Carrera / Turbo 1987 - 1989
Porsche 964 Carrera / Turbo 1989 - 1994
Porsche 993 Carrera / Turbo 1995 - 1998
Porsche 996 Turbo / GT2 / GT3 2001 - 2005
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 2010 - 2013
Porsche 996 GT3 1999 - 2005
Porsche 997 GT3 2007 - 2011

Diagram ref no 12

Application:
• Manual transmission input shaft oil seal
• Cross-referenced with superseded part number: 99911332640

The input shaft seal sits around the input/main shaft where it enters the transmission case. Its job is to keep transmission fluid from leaking out and to prevent contamination from entering the gearbox. By maintaining a secure seal around the rotating shaft, this component helps preserve optimal lubrication, reduce wear, and support smooth gear operation.

In a manual transmission, the input shaft takes power from the clutch and delivers it into the gearbox. The seal must endure rotation, pressure changes, heat, and exposure to transmission fluid, forming a durable barrier that keeps oil inside while preventing dirt and debris from entering. A properly functioning input shaft seal is crucial for transmission longevity and performance.

Over time and mileage, seals can harden, crack, or lose elasticity due to heat, oil exposure, and mechanical wear. A failed input shaft seal can lead to:
• Transmission fluid leaks
• Low fluid levels
• Increased gearbox noise
• Premature wear on gears and bearings
• Potential drivetrain damage

Replacing worn or leaking seals restores proper fluid containment and protects the integrity of the transmission system, preserving performance and reducing the risk of costly repairs.

Replace the input shaft seal if you notice:
• Visible transmission fluid leaks at the bellhousing area
• Low transmission fluid levels
• Gearbox whine or unusual noises
• Transmission slipping or crunching in gear shifts
• After transmission removal or overhaul

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

99911332641

99911332641

99911332640

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Oil seal for gear selector shaft. Porsche 911 / 912

99911318540/1

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

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4 4 4 4

Oil tube on gearbox housing. Porsche 911 87-89 / 964

95030112000

Product Information

Oil tube on gearbox housing.

Fits:
Porsche 911 Carrera 1987-89 with G5000, G5001, G5002 and G5050 Gearbox
Porsche 911 Turbo 1989 with G5050 Gearbox
Porsche 964 1989-94

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Diagram ref no 40

Related reference numbers
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95030112000

95030112000

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4 4 4 4

Radial shaft oil seal gearbox. Porsche 911 turbo 1975 - 1989

93030233201

Product Information

Radial shaft oil seal - gearbox.

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

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Diagram ref no. 26

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93030233201

93030233200

93030233201

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3 3 3

Radial shaft seal. Porsche 911 / 914 / 924

PCG113183A

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

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Diagram ref no 16

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

PCG113183A

99911318340

99911325840

089.567

PCG113183A

99911313050

99911320240

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3 3 3

Radial shaft seal. Porsche 911 / 914 / 924

PCG113183A/1

Product Information

99911318340

99911325840

089.567

PCG113183A

99911313050

99911320240

The product you are viewing cross references to these numbers

Throttle bell crank support rod. Porsche 356 / 911 / 914

91430130701

Product Information

Throttle bell crank support rod.

Fits:
Porsche 356B / 356C 1960-65
Porsche 911 1965-89
Porsche 914-6 / 914-6:SPM 1970-76

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Diagram ref no 13

Related reference numbers
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91430130701

91430130700

91430130701

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Throttle bell crank support rod. Porsche 356 / 911 / 914

91430130701/1

Product Information

91430130700

91430130701

The product you are viewing cross references to these numbers

3 3 3

Transmission case bush. Porsche 911 Turbo

99953101000

Product Information

Transmission case bush. Sold each.

Fits:
Porsche 911 Turbo 1978-89

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Diagram ref no 7

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99953101000

99953101000

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Transmission case gasket. Porsche 911 / 912 / 914

90130139212

Product Information

Transmission case gasket for 901 type transmissions.

Fits:
Porsche 911 1969-71
Porsche 912
Porsche 914

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Diagram ref no 2

Related reference numbers
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90130139212

90130139212

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Transmission case gasket. Porsche 911 / 912 / 914

90130139212/1

Product Information

90130139212

084.360

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Transmission Case Screw Plug. Porsche 911 72-73

91530731900

Product Information

Transmission Case Screw Plug.

Fits:
Porsche 911 Carrera 2.7L 1972-73

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Diagram ref no 13

Related reference numbers
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91530731900

91530731900

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DISPLAYING 33 to 48 (of 56 products)

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About Gearbox Casing / Casing Parts

Porsche Gearbox Casings & Casing Parts | Strength, Precision & Thermal Stability for Reliable Transmission Performance

The gearbox casing is the structural foundation of your Porsche’s transmission system. It houses and supports all internal components — including gears, bearings, shafts, and seals — ensuring correct alignment, strength, and efficient operation. High-quality casing components are essential for maintaining gearbox integrity, preventing leaks, and reducing vibration or mechanical stress.

At Design911, we supply precision-engineered gearbox casings and casing components designed to meet or exceed original performance specifications. Manufactured from high-strength aluminium or magnesium alloys, each casing ensures excellent rigidity, heat dissipation, and dimensional accuracy.

Whether you’re rebuilding a classic 911 transmission, repairing a damaged casing, or upgrading for performance reliability, our range of Porsche gearbox casings and casing parts guarantees strength, fitment precision, and long-term durability.

What Do Gearbox Casings & Casing Parts Do?

The gearbox casing acts as a rigid housing that protects internal components from damage, contamination, and misalignment while maintaining lubrication and temperature control.

Core Functions:

Provides structural support and alignment for all internal gearbox components.
Protects gears, shafts, and bearings from debris and external damage.
Maintains correct oil levels and internal pressure.
Ensures efficient heat dissipation for optimal transmission operation.
Prevents leaks through integrated seals and machined joints.

Without a properly functioning casing, gearbox alignment and performance can degrade — leading to premature wear, oil leaks, and even transmission failure.

Why Do Gearbox Casings & Components Fail or Get Damaged?

Gearbox casings are exposed to mechanical stress, vibration, and heat over time, which can cause fatigue, cracking, or oil leaks.

Common Causes of Failure Include:

Cracks or fractures from impact or over-torqued bolts.
Corrosion or oxidation, particularly on older magnesium casings.
Warping due to overheating or poor heat dissipation.
Damaged or worn sealing surfaces causing oil leaks.
Incorrect assembly or misalignment during installation.

When the casing or its mating surfaces fail, it can cause oil leakage, misaligned gears, excessive noise, or internal component wear — compromising gearbox performance and reliability.

Why Replace Your Porsche Gearbox Casing or Casing Parts?

Replacing a damaged or worn gearbox casing ensures structural integrity, correct alignment, and proper sealing — vital for transmission efficiency and performance. Upgraded or remanufactured casings also enhance durability and thermal control in high-performance applications.

Key Benefits:

Restores proper gearbox alignment and internal balance.
Prevents oil leaks and contamination of internal components.
Improves heat management and mechanical strength.
Reduces vibration and driveline noise.
Ensures long-term reliability during rebuilds or performance upgrades.
Available for manual, automatic, and PDK Porsche transmissions.

A high-quality gearbox casing or replacement part is essential during transmission rebuilds to maintain correct tolerances and optimal drivetrain function.

Highlights

Precision Porsche gearbox casings and casing parts.
Manufactured from high-strength aluminium or magnesium alloys.
Perfect fitment for Porsche 911, Cayman, Boxster, and classic models.
Designed for strength, rigidity, and long-term reliability.
Restores transmission efficiency and structural integrity.
Ideal for rebuilds, repairs, or performance transmission upgrades.

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Gearbox Casing / Casing Parts

Gearbox Casing / Casing Parts