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Gasket Sets / Gaskets / Seals / Lock Nuts
By OE Match
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 968 CS 3.0L 1993-95
OE Match differential output shaft seal, engineered to replicate the original Porsche component that seals the output shaft on the differential housing. It prevents gear oil from leaking out where the drive axles exit the differential - a critical sealing function in the drivetrain system.
Sold each.
Fits:
Porsche 911 Carrera 3.2L 1984 - 1989
Porsche 911 Turbo 3.3 1978 - 1989
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 1998 - 2005
Porsche 986 Boxster 3.2L 2000 - 2004
Porsche 986 968CS 1993 - 1995
Diagram ref no 20
The differential output shaft seal creates a pressure-resistant, low-friction barrier around the rotating driveshaft or axle stub where it exits the differential. It prevents differential oil from escaping the gearbox while allowing rotational movement, helping maintain optimal lubrication of internal gears, bearings, and limited-slip components.
Function: Installed in the differential carrier housing at the output flange, the seal’s elastomer lip bears against the rotating shaft surface, maintaining contact under variable engine speed, gear torque, and temperature conditions. The internal garter spring ensures the lip is held in consistent contact with the shaft surface, helping prevent weeping or drips that can lead to low lubricant levels and accelerated drivetrain wear.
A worn or hard differential output seal can lose its effectiveness over time, leading to leaks, oil drips, and reduced gear oil levels in the differential. Low lubricant can accelerate wear of differential bearings, gears, and limited-slip clutches - ultimately causing expensive internal damage. Replacing the seal with an OE Match component helps preserve proper differential lubrication, reduces contamination of nearby brake and suspension parts with oil, and maintains drivetrain longevity and performance.
When to replace:
• Visible gear oil leakage from the differential area
• Oil accumulating near the rear of the gearbox or under the car
• During differential service or rebuild
• After replacing output shafts/axle flanges
• Preventive maintenance on high-mile vehicles
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911334741
The product you are viewing cross references to these numbers
- 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
Fits:
Porsche 911 Carrera 1972-86
Transmission TYPE 915
Diagram ref no 23
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530119100
The product you are viewing cross references to these numbers
- 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
Fits:
Porsche 911 1972-86
Manual transmission
Diagram ref no 51
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530228200
The product you are viewing cross references to these numbers
- 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
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
The product you are viewing cross references to these numbers
- 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
Fits:
Porsche 911 2.0ltr - 3.2ltr 1963 to 1986
Porsche 930 3.0L - 3.3L 1975-89
Porsche 912 1.6ltr 1966 to 1976
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911318540
The product you are viewing cross references to these numbers
- 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
Fits:
Porsche 911 Carrera 1972-86
Transmission TYPE 915
Diagram ref no 23
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530135100
The product you are viewing cross references to these numbers
OEMatch Gasket Sets / Gaskets / Seals / Lock Nuts — Fit, Function, Confidence
For Porsche models, OEMatch supplies gasket sets, seals and lock nuts intended to protect gearboxes and differentials from lubricant loss and contamination while preserving correct internal clearances and pressure. These items are useful for routine service, gearbox rebuilds and resolving persistent transmission leaks.
Available Types
- Complete gearbox and differential gasket sets for rebuilds
- Individual shaft seals, O-rings and grommets
- Lock nuts and transmission fastener kits
Understanding OEMatch Gasket Sets / Gaskets / Seals / Lock Nuts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original gasket sets, gaskets, seals and lock nuts.
OE (Original Equipment) refers to parts matching original specifications for the gasket sets, gaskets, seals and lock nuts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM gasket sets, gaskets, seals and lock nuts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Gaskets and seals create pressure-tight joints between mating gearbox surfaces and around rotating shafts; lock nuts and fastening kits secure components subject to high torque and vibration. Correct material selection and surface condition are essential to maintain sealing performance, particularly where high temperature and exposure to transmission fluids can accelerate degradation. OEMatch integrates a broad catalogue of Porsche part references to help match application requirements.
Benefits Include
- Restores reliable oil containment to prevent leaks
- Preserves gearbox pressure and lubrication pathways
- Reduces the risk of internal wear and noise from fluid loss
Why Gasket Sets / Gaskets / Seals / Lock Nuts Wear and Fail
- Thermal cycling causing shrinkage, cracking or compression set of gasket materials
- Chemical attack or hardening of seals from aged or contaminated fluids
- Damaged or corroded mating surfaces created during service or by debris
- Incorrect installation or re-use of old sealing materials and fasteners
The Importance of Replacing with OEMatch Gasket Sets / Gaskets / Seals / Lock Nuts
Replacing worn or damaged sealing components prevents lubricant loss, contamination and consequential gearbox damage. Renewing gaskets, seals and lock nuts during a rebuild or major service restores designed sealing points and fastener security, helping to maintain smooth, reliable transmission operation and reducing the likelihood of repeat repairs.
Advantages
- Materials chosen for compatibility with transmission fluids and operating temperatures
- Restores intended sealing clearances and assembly torque behaviour
- Facilitates thorough gearbox servicing and long-term reliability when fitted correctly
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Clutch Kits
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Clutch Friction Plate
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Clutch Pressure Plate
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Clutch Cables & Parts
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Clutch Guide Tube
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Clutch Ring Gear
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Clutch Forks & Levers
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Clutch Bolts
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Gearbox Parts
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Driveshafts & Parts
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Gearbox Mounts
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Gearshift Control Parts
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Flywheel / Torque
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CV Joints Kits
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CV Boots and Kits
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Rear Differential
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Sensors
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Transmission Cooling
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Motor Sport Parts
