Please wait… 
Please wait while we process your order,
do not press the back button…
do not press the back button…
Your Vehicle
Porsche // 964 (911) (1989-1994) // 964 (911) RS 3.6L 1991-93
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
Category Filter
Lock nut for transmission main shaft. Porsche 911 72-89 / 964 / 993 / 996 turbo / 997 turbo / GT3 - 99903403300
99903403300
Vehicle Group
- 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 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 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 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Information
Lock nut for transmission pinion shaft - M30 x 1.5
The Genuine Porsche 99903403300 transmission pinion shaft lock nut is an OE M30 x 1.5 shouldered lock nut for selected Porsche manual gearbox applications, including 911 1972–1989, 964, 993, 996 Turbo, 997 Turbo and GT3 models. It secures key transmission shaft components and is ideal for gearbox rebuilds, transmission repairs or restoration using Genuine Porsche hardware.
Sold individually
Fits:
Porsche 911 - 1972 to 1989 (915 and G50)
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1994
Porsche 996 turbo - 2001 to 2005
Porsche 997 turbo - 2007 to 2013
Porsche 996 GT3 - 2003 to 2005
Porsche 997 GT3 - 2007 to 2011
Manual transmission
Diagram ref no 20
This nut is used in selected Porsche manual gearbox assemblies, including 915, G50 and later Turbo / GT gearbox applications where specified.
What This Part Does / Functions
• Secures transmission shaft components in position
• Helps maintain correct gearbox shaft assembly preload and alignment
• Supports proper operation of the pinion shaft / main shaft assembly
• Helps prevent loosening under drivetrain load and vibration
• Provides correct OE Porsche M30 x 1.5 thread and shouldered nut design
• Replaces a worn, damaged, previously removed or incorrectly reused lock nut
• Supports correct transmission rebuild and gearbox service procedures
• Maintains factory Porsche gearbox hardware specification.
Why Replace This Part?
Transmission lock nuts are critical gearbox fasteners. During gearbox rebuilds or shaft service, the original nut may be removed, disturbed, damaged or no longer suitable for reuse. A worn, distorted or incorrectly secured shaft nut can affect gearbox assembly, shaft retention and long-term reliability. Replacing it with a Genuine Porsche OE transmission shaft lock nut helps ensure the gearbox is rebuilt using the correct factory-specified hardware.
When to Replace This Part
• During manual gearbox rebuild or overhaul
• When servicing the transmission main shaft or pinion shaft
• If the original nut is worn, damaged, distorted or corroded
• If the nut has been removed during gearbox disassembly
• During differential, gear set or shaft bearing replacement
• If the original lock nut no longer secures correctly
• When restoring a Porsche gearbox with correct OE hardware
• Whenever Porsche workshop procedure recommends replacement after removal.
Where It Fits on the Car
This lock nut fits inside the manual transmission / gearbox assembly. It is used on the transmission main shaft or pinion shaft, depending on the gearbox type and application.
Installation requires correct Porsche gearbox tools, torque procedure and workshop specifications. This is a specialist transmission component and should be fitted by an experienced Porsche gearbox technician.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99903403300
The product you are viewing cross references to these numbers
The Genuine Porsche 99903403300 transmission pinion shaft lock nut is an OE M30 x 1.5 shouldered lock nut for selected Porsche manual gearbox applications, including 911 1972–1989, 964, 993, 996 Turbo, 997 Turbo and GT3 models. It secures key transmission shaft components and is ideal for gearbox rebuilds, transmission repairs or restoration using Genuine Porsche hardware.
Sold individually
Fits:
Porsche 911 - 1972 to 1989 (915 and G50)
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1994
Porsche 996 turbo - 2001 to 2005
Porsche 997 turbo - 2007 to 2013
Porsche 996 GT3 - 2003 to 2005
Porsche 997 GT3 - 2007 to 2011
Manual transmission
Diagram ref no 20
This nut is used in selected Porsche manual gearbox assemblies, including 915, G50 and later Turbo / GT gearbox applications where specified.
What This Part Does / Functions
• Secures transmission shaft components in position
• Helps maintain correct gearbox shaft assembly preload and alignment
• Supports proper operation of the pinion shaft / main shaft assembly
• Helps prevent loosening under drivetrain load and vibration
• Provides correct OE Porsche M30 x 1.5 thread and shouldered nut design
• Replaces a worn, damaged, previously removed or incorrectly reused lock nut
• Supports correct transmission rebuild and gearbox service procedures
• Maintains factory Porsche gearbox hardware specification.
Why Replace This Part?
Transmission lock nuts are critical gearbox fasteners. During gearbox rebuilds or shaft service, the original nut may be removed, disturbed, damaged or no longer suitable for reuse. A worn, distorted or incorrectly secured shaft nut can affect gearbox assembly, shaft retention and long-term reliability. Replacing it with a Genuine Porsche OE transmission shaft lock nut helps ensure the gearbox is rebuilt using the correct factory-specified hardware.
When to Replace This Part
• During manual gearbox rebuild or overhaul
• When servicing the transmission main shaft or pinion shaft
• If the original nut is worn, damaged, distorted or corroded
• If the nut has been removed during gearbox disassembly
• During differential, gear set or shaft bearing replacement
• If the original lock nut no longer secures correctly
• When restoring a Porsche gearbox with correct OE hardware
• Whenever Porsche workshop procedure recommends replacement after removal.
Where It Fits on the Car
This lock nut fits inside the manual transmission / gearbox assembly. It is used on the transmission main shaft or pinion shaft, depending on the gearbox type and application.
Installation requires correct Porsche gearbox tools, torque procedure and workshop specifications. This is a specialist transmission component and should be fitted by an experienced Porsche gearbox technician.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99903403300
99903403300
91530228100
The product you are viewing cross references to these numbers
Price: £19.73
In stock
Related products
Vehicle Group
- 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 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
Information
Shaft Sealing Ring for oil pump for Tiptronic gearbox.
40 x 52 x 7
Fits:
Porsche 964 Carrera 1989-94 Tiptronic
Porsche 993 Carrera 1994-98 Tiptronic
Click picture for large parts diagram.
Diagram Ref No 2.
40 x 52 x 7
Fits:
Porsche 964 Carrera 1989-94 Tiptronic
Porsche 993 Carrera 1994-98 Tiptronic
Click picture for large parts diagram.
Diagram Ref No 2.
Price: £25.98
Orderable
Vehicle Group
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 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
Information
Gearbox Gasket Set For G50 Gearbox.
The OE Match Gearbox Gasket Set for G50 Gearbox is a comprehensive transmission sealing kit designed to restore the integrity of the Porsche G50 manual gearbox during overhaul, repair or routine maintenance. Manufactured to OE specifications for fit, material quality and durability, this gasket set contains the essential seals and gaskets required to prevent transmission oil leaks and maintain correct lubrication throughout the gearbox.
Fits:
Produced from high-quality gasket materials resistant to gearbox oil, heat and pressure, the components are designed to provide long-lasting sealing performance under demanding operating conditions. Ideal for gearbox rebuilds and preventative maintenance, this OE Match kit helps ensure reliable operation and extends the service life of the transmission.
What This Product Does:
Symptoms Of Wear Or Failure:
Why Replacement Matters:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96430091200
The product you are viewing cross references to these numbers
The OE Match Gearbox Gasket Set for G50 Gearbox is a comprehensive transmission sealing kit designed to restore the integrity of the Porsche G50 manual gearbox during overhaul, repair or routine maintenance. Manufactured to OE specifications for fit, material quality and durability, this gasket set contains the essential seals and gaskets required to prevent transmission oil leaks and maintain correct lubrication throughout the gearbox.
Fits:
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 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
Produced from high-quality gasket materials resistant to gearbox oil, heat and pressure, the components are designed to provide long-lasting sealing performance under demanding operating conditions. Ideal for gearbox rebuilds and preventative maintenance, this OE Match kit helps ensure reliable operation and extends the service life of the transmission.
What This Product Does:
- Provides replacement gaskets and seals for the Porsche G50 gearbox.
- Restores leak-free sealing between gearbox components.
- Prevents transmission oil leaks.
- Maintains correct gearbox oil levels.
- Protects internal gears, bearings and synchronisers through proper lubrication.
- Supports reliable gearbox operation after servicing or rebuilding.
- Helps reduce the risk of contamination entering the transmission.
- Forms an essential part of any G50 gearbox overhaul or repair.
Symptoms Of Wear Or Failure:
- Gearbox oil leaks.
- Oil residue around gearbox mating surfaces.
- Low gearbox oil level.
- Difficulty selecting gears due to lubrication loss.
- Increased gearbox noise or whining.
- Oil contamination around the transmission housing.
- Burning oil smell after driving.
- Premature wear of gearbox components.
- Damp or stained transmission casing.
- Visible deterioration or hardening of gasket material during servicing.
Why Replacement Matters:
- Gearbox gaskets and seals are continually exposed to transmission oil, heat, pressure fluctuations and vibration. Over time, sealing materials can harden, shrink or deteriorate, allowing oil to escape and contaminants to enter the transmission.
- Loss of gearbox oil can reduce lubrication to gears, bearings and synchronisers, accelerating wear and potentially leading to expensive transmission damage. Oil leaks may also contaminate surrounding components and create maintenance issues.
- Replacing all critical gaskets and seals during gearbox servicing or rebuilding helps restore the transmission's sealing integrity and ensures long-term reliability. An OE Match Gearbox Gasket Set provides factory-style fitment, high-quality sealing materials and dependable durability, helping protect your Porsche G50 gearbox while maintaining smooth, reliable shifting performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96430091200
96430091200
95030091100
The product you are viewing cross references to these numbers
Price: £64.50
In stock
Vehicle Group
- 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
Information
Transmission Cover Gasket.
Fits:
Cars with Manual Gearbox
Porsche 911 1987-89 G50 Gearbox
Porsche 964 1989-94
Porsche 993 1995-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 31
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030135102
The product you are viewing cross references to these numbers
Fits:
Cars with Manual Gearbox
Porsche 911 1987-89 G50 Gearbox
Porsche 964 1989-94
Porsche 993 1995-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 31
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030135102
95030135102
The product you are viewing cross references to these numbers
Price: £4.87
In stock
Vehicle Group
- 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
Information
Sealing ring A20x24x1,5 on arresting bush.
Fits:
Porsche 964 (1991 to 1994) on distributor housing with transmission code G64.00/01/02
Porsche 964 (1991 to 1994) on transmission cover with TC G50.03/04/05
Porsche 993 Carrera/RS/4/4S and Turbo (1994 to 1998) on transmission cover with TC G50.20/21/31/33 and TC G64.20/21/51
Click 'Zoom in' for large parts diagram.
Diagram ref no 32
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90012301040
The product you are viewing cross references to these numbers
Fits:
Porsche 964 (1991 to 1994) on distributor housing with transmission code G64.00/01/02
Porsche 964 (1991 to 1994) on transmission cover with TC G50.03/04/05
Porsche 993 Carrera/RS/4/4S and Turbo (1994 to 1998) on transmission cover with TC G50.20/21/31/33 and TC G64.20/21/51
Click 'Zoom in' for large parts diagram.
Diagram ref no 32
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90012301040
90012301040
The product you are viewing cross references to these numbers
Price: £2.49
Orderable