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Gearbox Parts
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Differential rebuild kit for Porsche 911 1987–1989 G50 gearbox cars by OE Match, suitable for selected 911 3.2 G50 and 3.3 Turbo (930) models.
What This Product Does This kit provides the core components typically required to overhaul the rear differential assembly on G50-equipped Porsche 911 models, helping restore correct internal clearances and consistent operation of the unit.
Kit includes:
1 x Differential outer bearing, (Ref: 99905906400)
1 x Taper roller bearing. (Ref: 99905902702)
6 x Differential Housing Lock Plate. (Ref: 90133228501)
12 x Hexagon-head bolt (Ref: 92833227606)
Functions
- Supports refurbishment of worn differential internals
- Helps re-establish correct bearing support and gear contact
- Assists in reducing internal play and backlash when set up correctly
- Provides parts needed for a planned diff rebuild alongside other drivetrain work
Symptoms of Fault
- Whining or howling noises from the rear at cruise or on overrun
- Clunks when taking up drive or during gear changes
- Noticeable backlash or “thud” in the driveline
- Oil leaks from differential side seals or input area
- Vibration or roughness that changes with road speed
- Reduced or inconsistent traction on cars with limited-slip units
Why Replacement Matters
Over time, bearings, shims and internal hardware in the rear differential wear, especially on older Porsche 911 models that see mixed road use and age-related degradation. Refreshing these parts during a rebuild helps stabilise gear alignment, supports smooth torque transfer and can prevent accelerated wear of crownwheel, pinion and bearings. For G50 cars in particular, maintaining a healthy differential complements the robust gearbox design and contributes to a more predictable, refined drivetrain.
Fits
- Porsche 911 & 912 (1965–1989) – selected models with G50 gearbox
- Porsche 911 1987–1989 3.2L G50
- Porsche 911 1978–1989 3.3L Turbo (930) – applicable versions with G50 transmission
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905906400
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1987-1989 3.2L G50
- 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 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Sold each.

Fits:
Porsche 911 1987-89 - G50 gearbox
Porsche 964 1989-94 - G50 / G64 gearbox
Porsche 993 1995-98 - G50 / G64 gearbox
Porsche 928 1987-95 - G28 gearbox
Click 'Zoom in' for large parts diagram.
Diagram ref no 23
- Porsche 911 1987-1989 3.2L G50
- 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 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Sold each.

Fits:
Porsche 911 1987-89 - G50 gearbox
Porsche 964 1989-94 - G50 / G64 gearbox
Porsche 993 1995-98 - G50 / G64 gearbox
Porsche 928 1987-95 - G28 gearbox
Click 'Zoom in' for large parts diagram.
Diagram ref no 23
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99920300300
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
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 914 (1970-1976)
Our custom "coarse spline/18 spline" drive flanges will allow 930 or G50 CV joints (with metal grease caps) to bolt up to the early 1969-75 911s and all 914 transaxles.
Shaft length was designed with the stock open diff in mind. If by off-chance you have a factory LSD, spacers will be required.
Sold in pairs.
Fits
Porsche 911 - 1969 to 1975
Porsche 914
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
CMS.914.18T
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- 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
Fits:
Porsche 911 1987>>1989 (5-Speed Gearbox)
Porsche 959 1987>>1988
Porsche 964 Carrera 2 / 4 1989>>1994 (5-Speed Gearbox)
Porsche 993 Carrera 2 / 2S 1994>>1997 (6-Speed Gearbox)
Porsche 993 Carrera 4 / 4S 1994>>1997 (6-Speed Gearbox)
Porsche 993 Carrera RS 1994>>1997 (6-Speed Gearbox)
Porsche 993 Turbo 1994>>1996 (6-Speed Gearbox)
Diagram Ref No 22
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99920300410
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
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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 944 2.5L 8V 1982-87
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo S 2.5L 8V 1988
Pipe Clamp B20x20 – Multi-Use Clamp
Sold each
High-quality pipe clamp B20x20 designed for a wide range of securing applications across Porsche 911, 924, 924S, and 944 models.
This versatile clamp is used in multiple locations including
oil pump pipes, gearbox casing, air injection systems, brake servo pipes,
and battery cables, making it an essential component for maintaining
correct routing and system integrity throughout the vehicle.
Fits:
- 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 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 944 2.5L 8V 1982-87
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo S 2.5L 8V 1988
Diagram ref no 39
Manufactured to OEM specifications, this clamp provides secure fitment, durability, and resistance to corrosion. Supplied individually, it allows flexible replacement for maintenance, repair, or restoration projects.
Key Features
• Pipe clamp size B20x20
• Suitable for Porsche 911, 924, 924S, and 944
• Part number N0206071
• Multi-use: oil pipes, brake servo, air injection, battery cables
• Ensures secure mounting and routing
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually
Function and Purpose
This clamp is designed to secure various pipes, hoses, and cables.
It helps to:
• Hold components firmly in place
• Maintain correct routing and alignment
• Prevent vibration-related wear and damage
• Protect critical systems such as oil and braking
• Support long-term system reliability
Why Replace Pipe Clamps
Clamps can degrade over time due to heat and environmental exposure.
Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Movement of pipes or cables
• Increased risk of wear or failure
Replacing worn clamps ensures proper securing and protects system components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
N0206071
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
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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 944 2.5L 8V 1982-87
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo S 2.5L 8V 1988
Pipe Clamp B20x20 – Multi-Use Clamp
Sold each
High-quality pipe clamp B20x20 designed for a wide range of securing applications across Porsche 911, 924, 924S, and 944 models.
This versatile clamp is used in multiple locations including
oil pump pipes, gearbox casing, air injection systems, brake servo pipes,
and battery cables, making it an essential component for maintaining
correct routing and system integrity throughout the vehicle.
Fits:
- 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 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 944 2.5L 8V 1982-87
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo S 2.5L 8V 1988
Diagram ref no 39
Manufactured to OEM specifications, this clamp provides secure fitment, durability, and resistance to corrosion. Supplied individually, it allows flexible replacement for maintenance, repair, or restoration projects.
Key Features
• Pipe clamp size B20x20
• Suitable for Porsche 911, 924, 924S, and 944
• Part number N0206071
• Multi-use: oil pipes, brake servo, air injection, battery cables
• Ensures secure mounting and routing
• Durable and corrosion-resistant construction
• OEM-style fit and performance
• Sold individually
Function and Purpose
This clamp is designed to secure various pipes, hoses, and cables.
It helps to:
• Hold components firmly in place
• Maintain correct routing and alignment
• Prevent vibration-related wear and damage
• Protect critical systems such as oil and braking
• Support long-term system reliability
Why Replace Pipe Clamps
Clamps can degrade over time due to heat and environmental exposure.
Common issues include:
• Loss of clamping strength
• Corrosion or fatigue
• Movement of pipes or cables
• Increased risk of wear or failure
Replacing worn clamps ensures proper securing and protects system components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
N0206071
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93

Fits:
Porsche 911 Carrera (1987 to 1989) with transmission code G50.00/01/50
Porsche 964 Carrera 2/4 (1989 to 1994)
Click 'Zoom in' for large parts diagram.
Diagram ref no 25
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911014400
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
This OE-Match cylindrical roller bearing is manufactured to Porsche’s original specifications, offering a precise, direct-fit replacement for the factory-installed part.
Fits:
Porsche 911 Carrera (1987 to 1989) * with transmission code G50.00/01/50
Porsche 964 Carrera 2/4 (1989 to 1994)
Diagram ref no 25
• Used in Porsche 911 and 964 models, typically within the gear housing / transmission pinion case as a main roller bearing in the gearbox or pinion casing.
• Positioned on the main shaft / pinion assembly, between casing and rotating elements to carry load and maintain rotation integrity.
What Cylindrical roller bearing does:
• Supports and allows smooth rotation of a shaft under load by reducing friction and handling radial forces
• Maintains alignment, stability, and precision operation of gears and shafts in the drivetrain or gearbox assembly
• Keeps components running quietly and reliably by providing a durable rolling interface
A worn bearing can cause play, noise, or gear misalignment, and in severe cases, lead to transmission failure. Replacing bearing restores the correct fit and load capacity, preventing further wear to surrounding parts. This ensures long-lasting gearbox durability, reduced vibration, and smooth, reliable performance under stress.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911014400
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- 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

Fits:
Porsche 911 Carrera 1987-89 (G5000 / G5001 /
G5002 / G5050)
Porsche 964 1989-94
Click 'Zoom in' for large parts diagram.
Diagram ref no 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911014203
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- 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

Fits:
Porsche 911 Carrera 1987-89 (G5000 / G5001 /
G5002 / G5050)
Porsche 964 1989-94
Click 'Zoom in' for large parts diagram.
Diagram ref no 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911014203
The product you are viewing cross references to these numbers
- 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

Fits:
Porsche 911 Carrera 1987-89 Manual 5-Speed
Porsche 964 C2 / C2 RS / Turbo 1989-94
Porsche 993 1995-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911010901
The product you are viewing cross references to these numbers
- 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

Fits:
Porsche 911 Carrera 1987-89 Manual 5-Speed
Porsche 964 C2 / C2 RS / Turbo 1989-94
Porsche 993 1995-98
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911010901
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C2 1994-97
- 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 GT2 RS 2011-13
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94

Fits:
Porsche 911 1987-89
Porsche 911 Turbo 1975-89
Porsche 968 1992-95
Porsche 964 C2 / C4 1989-94
Porsche 993 C2 1994-98
Porsche 986 Boxster S 2000-04
Porsche 996 C2 / C4 1998-05
Porsche 996 Turbo GT2 2001-05
Porsche 996 GT3 2000-05
Porsche 997.1 Turbo / GT2 / GT2 RS 2007-09
Porsche 997.2 GT2 RS 2011
Porsche 997 GT3 / GT3 RS 2007-11
Click 'Zoom in' for large parts diagram.
Diagram ref no 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905906400
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C2 1994-97
- 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 GT2 RS 2011-13
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
This OE Match differential outer bearing is a replacement left-side differential bearing for selected Porsche 911, 964, 993, 986 Boxster, 996, 997, and 968 models. It is designed to match the original-style fitment and function, helping support correct differential operation and drivetrain reliability.
Fits:
Porsche 911 1987 - 1989
Porsche 911 Turbo 1975 - 1989
Porsche 968 1992 - 1995
Porsche 964 C2 / C4 1989 - 1994
Porsche 993 C2 1994 - 1998
Porsche 986 Boxster S 2000 - 2004
Porsche 996 C2 / C4 1998 - 2005
Porsche 996 Turbo GT2 2001 - 2005
Porsche 996 GT3 2000 - 2005
Porsche 997.1 Turbo / GT2 / GT2 RS 2007 - 2009
Porsche 997.2 GT2 RS 2011
Porsche 997 GT3 / GT3 RS 2007 - 2011
Diagram ref no 11
The differential outer bearing supports the rotating differential assembly within the gearbox or transaxle housing. It helps maintain correct alignment, smooth rotation, and controlled movement of the differential components as engine power is transferred through the transmission to the drive wheels.
Functions
• Supports the differential assembly inside the gearbox / transaxle
• Helps maintain correct differential alignment
• Allows smooth rotation under drivetrain load
• Supports reliable power transfer to the drive wheels
• Helps reduce vibration, noise, and excessive internal movement
• Replaces worn, noisy, damaged, or failed differential bearings
• OE Match replacement for gearbox, transaxle, or differential repair.
Why Replace This Part?
Differential bearings are exposed to constant load, heat, gear oil, vibration, and high-speed rotation. Over time, the bearing can wear, pit, develop play, become noisy, or fail due to contamination, lack of lubrication, or age. A worn differential bearing may cause whining noises, rumbling, vibration, metal debris in the oil, drivetrain play, or gearbox damage if left unresolved. Replacing the bearing helps restore smooth differential operation and protects surrounding transmission components.
When to Replace This Part
• There is whining, rumbling, or bearing noise from the gearbox / differential area
• Excessive differential play or movement is found during inspection
• Metal particles or bearing debris are found in the gearbox oil
• The bearing is worn, pitted, loose, or damaged
• The gearbox or transaxle is being rebuilt
• The differential has been removed or serviced
• Preventative replacement is being carried out during transmission overhaul.
Where it fits on the car
This bearing fits on the left-side outer differential bearing position within the gearbox or transaxle assembly. It forms part of the differential support system and should be installed according to the factory transmission layout and bearing preload procedure.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905906400
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)

Fits:
Porsche 911 Turbo 930.36/37 1984-88
Porsche 911 Carrera M491 915.72/73 Turbo Look 1984-88
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93033223205
The product you are viewing cross references to these numbers
High-Quality Gearbox Parts for Smooth, Precise and Long-Lasting Transmission Performance
Gearbox parts are at the heart of your vehicle’s transmission system, ensuring power is transferred smoothly from the engine to the wheels. These components—including gears, synchros, bearings, selector mechanisms, seals and shafts—must operate with precision to provide crisp gear changes, reduced drivetrain noise and optimal driving performance. Whether you’re rebuilding a worn transmission, upgrading for performance, or repairing specific issues, choosing the right gearbox parts is essential for long-term reliability.
What Gearbox Parts Do
Transmission components work together to manage torque
delivery and gear selection.
Their key roles include:
- Enabling
smooth gear shifting through synchroniser assemblies
- Transferring
power efficiently from engine to drivetrain
- Maintaining
correct gear alignment via bearings, shafts and selectors
- Reducing
friction and heat with precision-machined internal components
- Ensuring
responsive and reliable gear engagement under all driving conditions
- Supporting high-load and performance driving with upgraded materials and tolerances
When these parts are in good condition, the gearbox operates quietly, engages gears cleanly and delivers consistent performance.
Why Gearbox Parts Commonly Fail
Gearboxes experience constant mechanical load, friction and
temperature cycles. Over time, internal components can weaken or wear out due
to:
- Synchro
ring wear causing notchy or difficult gear engagement
- Bearing
failure leading to whining, vibration or misalignment
- Gear
tooth damage from aggressive shifting or lubrication issues
- Worn
selector forks or linkages affecting precision and feel
- Oil
contamination accelerating wear on bearings and synchros
- Leaking
seals causing low lubrication levels
- High-mileage fatigue in shafts, pins and internal hardware
Even small failures can quickly escalate into major transmission issues if not addressed in time.
Why You Should Replace Worn Transmission Components
Replacing ageing or damaged gearbox parts with high-quality, precision-engineered alternatives designed to match original performance standards ensures your transmission remains smooth, durable and reliable.
Benefits of replacing worn parts include:
- Restored smooth gear changes and reduced notching
- Improved drivetrain efficiency and power delivery
- Reduced internal wear and noise
- Enhanced lifespan of other transmission components
- Prevention of costly gearbox failure
- Confidence in both daily driving and performance applications
A refreshed gearbox not only improves driving enjoyment but also protects the significant investment in your vehicle’s drivetrain.