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Bearings / Bearing Retaining Plates / Bushes
By OE Match
- 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 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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
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 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) 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 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)

Fits:
Porsche 914/6 1970–1972 Sportomatic gearbox only
Porsche 911 F 1965–1973
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905900800
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 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
This flywheel-end shaft bearing is used on Porsche 911 equipped with 915 transmissions. This bearing supports the pinion shaft at the flywheel end, maintaining precise shaft alignment and smooth rotation under load. It minimizes internal friction, prevents excessive play, and helps maintain correct gear mesh, reducing noise and extending gearbox life.
Fits:
Porsche 911 1974 - 1989 equipped with 915 manual gearbox
Diagram Ref no 28.
A worn pinion bearing causes gear whine, shaft play, rough shifting, metal contamination in the oil, and can lead to severe internal gearbox damage. Replacing it during a rebuild restores proper alignment, quiet operation, and long-term reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911014601
The product you are viewing cross references to these numbers
- 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 1974-86 (915 Gearbox)
Diagram Ref no 18.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905203000
The product you are viewing cross references to these numbers
- 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 1974-86 (915 Gearbox)
Click 'Zoom in' to see the diagram.
Diagram Ref no 29.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99905204300
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 1975-1977 3.0L Turbo (930)
A four-point contact bearing inside the gearbox housing that supports the pinion / differential or output shaft, maintaining correct alignment and rotational support under load. It is a critical structural component of the transmission case on classic 911 / 914 gearboxes. Sold as a single bearing unit - replace as needed when rebuilding or servicing the gearbox, or when diagnosing shaft play or bearing wear.
Fits:
Porsche 911 1965 - 1971 Manual Gearbox cars
Porsche 911 1965 - 1983 Sportomatic Gearbox cars
Porsche 914 1970 - 1976 Manual and Sportomatic gearboxes
This bearing replaces the factory-installed unit (or previous equivalent bearing - OE part number 99905201600) and restores proper gearbox support for shafts that transmit torque and rotational forces - vital for gearbox longevity and reliable shifting.
Gearbox bearings wear out over time from torque loads, heat, and repeated cycles. A worn or damaged four-point bearing may lead to:
• Shaft misalignment or excessive play
• Increased gear noise, whining or rumbling
• Premature wear on shafts, gears, or synchros
• Gearbox instability or failure under load
Replacing with a correctly spec’d bearing restores shaft integrity, ensures smooth power transmission, and helps prevent costly internal damage - especially important on vintage 911 and 914 gearboxes where early detection can save major rebuilds.
You should consider replacing this bearing if:
• There is noticeable shaft play or wobble in the gearbox output or pinion shaft
• You hear whining, rumbling, or unusual noise from the gearbox under load
• The gearbox has high mileage or has seen hard use
• You are performing a gearbox rebuild, overhaul, or restoration
• Internal inspection reveals bearing wear, scoring, or heat damage
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9990520160A
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50

Fits:
Porsche 911 Carrera 1987-89 (G50.00 / G50.01 / G50.02)
Click 'Zoom in' for large parts diagram.
Diagram ref no 25
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG05208800
The product you are viewing cross references to these numbers
- 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 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65

Fits:
Porsche 356 / 356A 1950-59 (G 11 001 >> 25 000)
Porsche 356 / 356A 1950-59 (716/0/1/2/3, 716/4/5)
Porsche 356B / 356C 1960-65
Porsche 911 SC / Carrera 1974-86
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530239906
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

Fits:
Porsche 911 1965-73 MAN
Porsche 911 1965-83 SPM
Click 'Zoom in' for large parts diagram.
Diagram ref no 16
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911000800
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- 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
Cylindrical Roller Bearing, Engineered to match the original equipment’s dimensions, load rating and fitment, this bearing provides a direct-fit replacement for the factory unit. This bearing supports the main shaft or input/output shaft of certain Porsche manual gearboxes. It ensures smooth rotation, proper alignment of the transmission internals and helps reduce friction and wear during operation. It used near the collar nut or locknut area.
Fits:
Porsche 911 3.2L 1984-86 for 4 and 5-speed models
Porsche 911 Turbo 3.0L 1975-77
Porsche 911 Turbo 3.3L 1978-88 (4 speed)
Porsche 924 1976-85 Only 5 speed transmission
Porsche 924 Carrera GT 1981
Porsche 924 Turbo 1979-84
Diagram ref no 23
Transmission bearings support rotating shafts and gear clusters under high loads and speeds. Over time wear, misalignment or contamination in the gearbox can cause bearing failure, leading to increased friction, vibration, noise or even gearbox damage. Correct bearing fit is essential for longevity and precision of the transmission.
When to replace:
• During any gearbox overhaul or rebuild, especially when shafts or collar nuts are removed.
• If you notice unusual gearbox noises (rumbling, growling) or shaft play during inspection.
• Whenever replacing major gearbox components—such as synchros, shafts, or other bearings—as a preventive maintenance measure, ensuring optimal alignment and performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030239101
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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65

Fits:
Porsche 911 1972-86
Porsche 911 (930) Turbo 1975-89
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911002500
The product you are viewing cross references to these numbers
-
replacement transmission, transmission case 1978-83 302-00
-
gear housing, transmission cover 1978-83 302-05
-
gears and shafts 4. speed transmission - G 930/34 - 911 1978-83 303-05
-
gears and shafts 5. speed transmission - G 915 - 911 1978-83 303-15
-
replacement transmission, transmission case SPM - G 925/16 - 911 1978-83 308-00
-
replacement transmission transmission case 911 1987-89 302-00
-
gear housing transmission cover 911 1987-89 302-05
-
gear housing / transmission cover 911 1987-89 302-07
-
gears and shafts 4-speed gear wheel sets see group 3/03/00 303-05
-
gears and shafts 5-speed gear wheel sets see group 3/03/10 303-15
-
differential 911 1987-89 305-00
-
replacement transmission transmission case die casting for 911 UPTO 1971 302-10
-
Gear housing complete, transmission case front and transmission suspension for 911 1972 ONWARDS 302-25
-
Gears and shafts 4-speed transmission for 911 E/S UPTO 1970 and 911 T UPTO 1971 303-25
-
Differential for manual transmission TYP 915 and sportomatic TYP 925 with armature 911 1970-73 305-05
-
Differential for sportomatic TYP 905, Model SPM 911 1970-73 305-10
-
limited-slip differential 911 1970-73 305-15
-
transmission case sportomatic for 911 T/E UPTO 1971 307-00
-
transmission case TYP 905/21 sportomatic for 911 T-V 1972 ONWARDS 307-10
-
transmission case sportomatic TYP 925 for 911 T-E/E/S and CARRERA 2.7 and 911 T-K 1972 ONWARDS 307-20
-
gears and shafts SPM - G 925/16 - 911 1978-83 309-05
-
differential SPM 911 1978-83 311-00
-
gear housing, transmission cover 911 1984-86 302-05
-
gears and shafts 4-speed 911 1984-86 303-05
-
gears and shafts 5-speed 911 1984-86 303-15
-
Differential 911 1984-86 305-00
-
Gear housing, transmission cover 911 1974-77 302-05
-
Gears and shafts 4-speed - Model 915 - 911 1974-77 303-05
-
Gears and shafts 5 speed - Models: TYP 915 / TYP 923 - 911 1974-77 303-15
-
Differential 911 1974-77 305-00
-
Replacement transmission, transmission case 911 1974-77 SPM 308-00
-
Gears and shafts 911 1974-77 SPM 309-05
-
replacement transmission, transmission case chilled casting for 911 T/E/S UPTO 1970 302-00
-
gears and shafts 5-speed transmission for 911 UPTO 1971 303-05
-
Gears and shafts 5-speed transmission (gear wheel sets 915.300/02) for 911 1972 onwards 303-15
-
gears and shafts 4-speed transmission for 911 1972 ONWARDS 303-35
-
differential with chilled casting or die casting housing without armature 911 1970 305-00
-
gears and shafts sportomatic for 911 1972 ONWARDS 308-15
-
replacement transmission, transmission case, chilled casting 911 1965-69 302-00
-
replacement transmission, transmission case, die casting 911 1969 onwards 302-10
-
gears and shafts 5-speed transmission 911 1965-69 303-05
-
gears and shafts 4-speed transmission 911 1965-69 303-15
-
differential for 911 TU / 912 1968 305-05
-
differential sportomatic 911 TU/L/S UPTO 1968 305-10
-
differential with chilled casting or die casting housing for 911 1969 305-15
-
limited-slip differential for die casting housing 911 1969 305-25
-
transmission case sportomatic 911 1965-69 307-00
-
gears and shafts sportomatic 911 1965-69 308-05
-
gear housing, transmission cover 911 TURBO 1975-77 302-05
-
gear wheel sets 911 TURBO 1975-77 303-05
-
differential 911 TURBO 1975-77 305-00
-
gears and shafts 308-05
OEMatch Bearings / Bearing Retaining Plates / Bushes — Fit, Function, Confidence
OEMatch supplies bearings, retaining plates and bushes for Porsche models, intended to support gearbox rebuilds, maintenance and restoration projects. These precision parts maintain shaft alignment, reduce friction and control vibration to preserve gearbox behaviour across road and competition applications. OEMatch catalogs over 4,000 individual part numbers and more than 8,700 OE cross-references, and continues to develop new lines for Porsche applications.
Available Types
- Individual gearbox bearings for input, layshaft and output shafts
- Machined and pressed bearing retaining plates and covers
- Polymer and metal bushings supplied as single items or repair kits
Understanding OEMatch Bearings / Bearing Retaining Plates / Bushes
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original bearings, retaining plates and bushes.
OE (Original Equipment) refers to parts matching original specifications for the bearings, retaining plates and bushes and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM bearings, retaining plates and bushes engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Bearings, retaining plates and bushes support rotating assemblies and keep gearsets correctly aligned. Bearings reduce friction between moving parts, retaining plates fix bearing position and resist axial movement, and bushes absorb side loads and damp vibration. Correct material, heat treatment and machining tolerances are key for reliable service life in Porsche gearboxes.
Benefits Include
- Restored gear alignment and smoother gear engagement
- Reduced friction and lower operating temperatures
- Less vibration and quieter gearbox operation
Why Bearings / Bearing Retaining Plates / Bushes Wear and Fail
- Insufficient or contaminated lubrication leading to accelerated bearing wear
- Heat damage and material fatigue from sustained high loads
- Corrosion and contamination from moisture or debris ingress
The Importance of Replacing with OEMatch Bearings / Bearing Retaining Plates / Bushes
Replacing worn bearings, retaining plates and bushes restores precise shaft support and prevents secondary damage to gears and shafts. Using well-specified replacements reduces the risk of noise, shifting issues and rapid re-wear after a rebuild. For Porsche gearboxes, matching materials and tolerances helps maintain intended clearances and load distribution, which is especially important where high revs and sustained torque are encountered.
Advantages
- Parts selected for Porsche applications and cross-referenced to common original numbers
- Options for standard replacement or upgraded materials where listed
- Kits and individual items to suit full rebuilds or targeted repairs