Bearings / Bearing Retaining Plates / Bushes

Gearbox cylindrical roller bearing. 30 x 62 x 20

Fits:
Porsche 911 Carrera 1987-89 5-speed MAN
Porsche 911 (930) Turbo 1989 5-speed MAN
Porsche 964 C2 / C4 1989-94 5-Speed MAN
Porsche 964 Carrera 2 RS 1992 5-Speed MAN
Porsche 964 Turbo 1991 5-Speed MAN
Porsche 993 C2 / C4 / C4S 194-98 6-Speed MAN
Porsche 993 Carrera RS 1995 6-Speed MAN
Porsche 993 Turbo 1995-98 6-Speed MAN
Porsche 996 Turbo / GT2 2001-05 6-Speed MAN
Porsche 997 GT2 2008-09 6-Speed MAN
Porsche 997 GT2 RS 2011 6-Speed MAN
Porsche 996 GT3 1999-05 6-Speed MAN
Porsche 997 GT3 / GT3 RS 2007-11 6-Speed MAN

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Diagram ref no 27

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99911011701

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Gearbox cylindrical roller bearing. 30 x 62 x 20
OE Match cylindrical roller bearing for the gearbox assemblies of selected Porsche models. Its supplied dimensions are 30 x 62 x 20 mm, with five-speed and six-speed manual applications detailed below.

Fits
For cars with 5-speed MANUAL transmission
Porsche 911 Carrera 1987 - 1989 
Porsche 911 (930) Turbo 1989
Porsche 964 C2 / C4 1989 - 1994 
Porsche 964 Carrera 2 RS 1992 
Porsche 964 Turbo 1991 

For cars with 6-speed MANUAL transmission
Porsche 993 C2 / C4 / C4S 1994 - 1998
Porsche 993 Carrera RS 1995
Porsche 993 Turbo 1995 - 1998
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 997 GT2 2008 - 2009
Porsche 997 GT2 RS 2011
Porsche 996 GT3 1999 - 2005
Porsche 997 GT3 / GT3 RS 2007 - 2011

Diagram ref no 27

What This Product Does

The bearing supports rotating components within the transmission, helping maintain their alignment while limiting friction. It is an internal gearbox component, rather than a clutch release bearing or retaining plate.

Functions

• Support rotation within the gearbox assembly.
• Help locate transmission components accurately.
• Limit friction at the bearing interface.

Symptoms of Fault

• Whining or rumbling from the transmission.
• Excessive movement in a supported shaft.
• Metallic debris discovered during an oil inspection.
• Visible bearing discolouration or damaged rolling surfaces.

Why Replacement Matters

A worn bearing can allow unwanted movement and contribute to further internal wear. During repair or rebuilding, inspect neighbouring bearings, shaft surfaces, retaining components and lubrication condition rather than treating noise alone as proof of this bearing's failure.

FAQs

• Does gearbox noise confirm a faulty bearing?
  No. Oil condition, mounts, clutch components and other internal parts can produce similar symptoms, so diagnosis should precede replacement.
• Can only one bearing be renewed?
  A single replacement may be appropriate after inspection. A gearbox rebuild should include an assessment of the other bearings and supporting components.
• What should be checked before fitting?
  Verify the transmission code, original reference and dimensions, then assess adjacent components and use the specified gearbox lubricant.

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99911011701

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This OE Match main shaft bearing supports the gearbox shaft as it rotates, helping maintain its alignment within the transmission housing. 

Fits

• Porsche 993 Carrera / RS / Turbo 1995>>
• Porsche 997 Turbo 2007-09 G97.50
• Porsche 997 Turbo GT2 2008-09 G97.88
• Porsche 997 GT2 RS 2011 G97.88
• Porsche 997 GT3 / GT3 RS 2007-11 G97.90/92
  
  Check the production date and original reference before selecting the bearing.
  
   Diagram ref no 7
  
  What Is This Part?

This is a cylindrical-roller bearing used within the gearbox housing and transmission-cover assembly. Its rolling elements allow the shaft to rotate while the bearing supports it relative to the housing. Correct shaft support forms part of the gearbox's internal alignment, alongside the other bearings, retaining components and housing seats. Replacement is an internal transmission repair rather than an external adjustment.

What Does This Part Do?

• Supports the shaft: Provides a bearing support within the gearbox housing.
• Allows rotation: Uses rolling contact between the bearing surfaces as the shaft turns.
• Maintains alignment: Works with the remaining shaft supports to keep the rotating assembly correctly positioned.
  
  Why Replace This Part?

Replace the bearing if inspection confirms damaged rolling surfaces, excessive wear or rough rotation. Inadequate lubrication and contaminated oil can damage bearing surfaces, so the cause of deterioration should be investigated alongside the bearing itself.
Particles circulating in the lubricant can indent the rolling surfaces and contribute to further deterioration. During repair, inspect the shaft seat, housing seat and associated retaining components rather than assuming that replacing the bearing alone will resolve the underlying problem. 

When to Replace This Part?

• Confirmed surface damage: Pitting, flaking, scoring or corrosion found during dismantling warrants assessment and replacement where necessary. 
• Rough rotation or abnormal play: Inspect the bearing and its mounting seats against the gearbox repair specifications.
• Gearbox whine or rumbling: Investigate the complete transmission before identifying this bearing as the cause.
• Metallic debris in the oil: Establish which internal components are deteriorating before reassembly.
• Removal or fitting damage: Scratched rolling surfaces or impact damage can make a bearing unsuitable for reuse. 
  
  Where Is This Part Fitted?

Location: Inside the gearbox, within the gear-housing and transmission-cover assembly, supporting the main shaft. Access requires transmission dismantling appropriate to the gearbox type.

Technical Details

• Construction: Cylindrical-roller bearing.
• Dimensions: 30 × 62 × 16 mm, as identified for the gearbox applications.
• Production-date distinction: The Porsche 997.2 GT2 RS application has a reference change on 01.07.2011.
  
  FAQs

• Does gearbox noise prove this bearing has failed? No. Other bearings, gears, lubrication issues and surrounding drivetrain components can produce similar symptoms. Diagnosis should establish the source before parts are ordered.
• Should other parts be checked during replacement? Yes. Inspect the shaft and housing seats, retaining components, other bearings and seals, and check the lubricant for contamination.
• Can one bearing be replaced during a rebuild? Where inspection supports it, an individual bearing may be replaced. Assess the remaining bearings rather than assuming that all are serviceable or that all require renewal.
  
  Product Summary

• Product: Main shaft cylindrical-roller bearing.
• Brand: OE Match.

Related reference numbers
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99911018103

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Main shaft bearing. 30 x 32 x 16.

Fits:
Porsche 993 Carrera / RS / Turbo 1995>>
Porsche 997 Turbo 2007-09 G97.50
Porsche 997 Turbo GT2 2008-09 G97.88
Porsche 997 GT2 RS 2011 G97.88
Porsche 997 GT3 / GT3 RS 2007-11 G97.90/92

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Diagram ref no 7

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99911018103

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Needle-roller bearing, 4th speed, 35 x 47 x 32.2,
Sold each.

Fits:
Porsche 993 Turbo 1994-98 (G6451)

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Diagram ref no 5

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99920143706

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Pinion shaft bearing.

Fits:
Porsche 964 1989-94
Porsche 993 1995-98
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05

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Diagram Ref no 25

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99905222701

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Pinion shaft bearing
OE Match pinion shaft bearing for selected Porsche 964, 993, 996 Turbo and 996 GT3 transmissions. Supplied diagram information identifies a four-point or angular-contact bearing measuring 40 × 82 × 18 mm.

Fits:

• Porsche 964 1989 - 1994
• Porsche 993 1995 - 1998
• Porsche 996 Turbo 2001 - 2005
• Porsche 996 GT3 1999 - 2005

Diagram Ref no 25

What This Product Does

This gearbox bearing supports the rotating pinion shaft and helps maintain its position within the transmission. Correct bearing condition is important for shaft alignment and controlled rotation under load.

Functions

• Supports pinion shaft rotation.
• Helps keep the shaft correctly located.
• Limits friction at the bearing interface.

Symptoms of Fault

Possible signs include speed-related whining, rumbling, excessive shaft movement or metallic debris in gearbox oil. These symptoms require diagnosis: clutch, linkage, mounts and lubrication faults can produce similar complaints.

Why Replacement Matters

Renewing a worn bearing helps address unwanted shaft movement and rough rotation during transmission repairs. Inspect neighbouring bearings, gears, seals and retaining components during dismantling rather than assuming this bearing alone explains every symptom.

FAQs

Can just one bearing be renewed?
It may be appropriate after inspection, but the condition of the remaining transmission components should guide the repair.

Does gearbox oil specification matter?
Yes. Use the lubricant specified for the particular transmission; changing oil does not repair mechanical bearing damage.

How should compatibility be checked?
Compare reference 99730229300, the vehicle details and the gearbox code before selecting the bearing.

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99905222701

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Rear left and right differential carrier bearing.

Fits:
Porsche 911 1969-1971*
Porsche 911 1972-1989
Porsche 912 1969 *
Porsche 912E 1976
Porsche 914 1970-1976
Porsche 930 Turbo 1976-1989
Porsche 911 (964) C2 1989-1994 (rear right only)
Porsche 911 (964) Turbo 1990-1994 (rear right only)
Porsche 911 (993) 1995-1998 (rear right only)
Porsche 924 1976-1985
Porsche 928 1978-1995

* For models with magnesium pressure cast housing.

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Diagram ref no 8

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99905902702

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Rear left and right differential carrier bearing.
This tapered roller bearing, also known as a differential carrier bearing, is used in the rear output assemblies of the differential and manual transmission on various classic Porsche models. Engineered as a precise OE replacement, it meets the original Porsche specifications for dimensions, load capacity, and tolerance. The bearing installs directly without modification, restoring proper carrier alignment, support, and smooth drivetrain operation.
Sold individually.

Fits:
Porsche 911 1969-1971 * with magnesium pressure cast housing
Porsche 911 1972 - 1989
Porsche 912 1969 * with magnesium pressure cast housing
Porsche 912E 1976
Porsche 914 1970 - 1976
Porsche 930 Turbo 1976-1989
Porsche 911 (964) C2 1989 - 1994 (rear right only)
Porsche 911 (964) Turbo 1990 - 1994 (rear right only)
Porsche 911 (993) 1995 - 1998 (rear right only)
Porsche 924 1976 - 1985
Porsche 928 1978 - 1995

Diagram ref no 8

•  Function: This bearing supports and aligns the differential carrier or manual transmission rear output shaft, allowing smooth rotation under load and controlling radial/axial movement of the carrier assembly. It ensures the differential or transmission output runs true, quietly and with minimal friction.

•  Position on Car: Usually located in the manual transmission/differential rear housing (for example in the rear of the 911 manual gearbox, or the transaxle/differential carrier area). It may serve as the bearing between the carrier housing and the output shaft or differential ring-gear carrier.

•  This part is critical for proper gear meshing, quiet running, bearing life and overall driveline integrity.

With age and use, the bearing can develop wear in its rollers/races, looseness, noise, increased friction, or misalignment. A worn bearing may lead to drivetrain noise, vibration, premature gear or bearing damage, loss of efficiency, or catastrophic failure. The bearing supports the differential carrier output shaft – incorrect bearing performance can result in excessive play, wobble, and stress on neighbouring components.

When to Replace:
•  During a differential or transmission rebuild, where the carrier, output shafts or bearings are being replaced — it’s best practice to install new bearings.
•  If you detect noise (growl, whine, hum) coming from the rear differential or output area, particularly under load or at higher speed. If there is measurable play / movement in the differential carrier or abnormal backlash in the gearset. If you notice metal debris, “bearing-noise” or vibration emanating from the drivetrain output / differential area. 

•  When you upgrade or service the manual transmission/differential – matching new components with new bearings ensures optimum alignment, longevity and performance.

Replacing this bearing means you restore correct support and alignment, minimise noise, protect the differential and improve durability. This part is critical for proper gear meshing, quiet running, bearing life and overall driveline integrity.

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99905902702

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