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- 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
Synchro Ring – 3rd / 4th /
5th & Reverse Gear
Sold each - 4 required per car
Restore the smooth, precise gear changes your Porsche was
designed to deliver with this OE Match Synchro Ring for the Porsche 964 manual
gearbox. Manufactured to the original factory specification,
this helps provide accurate synchronisation
and helping restore crisp, positive gear engagement.
Fits:
- 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
Diagram Ref no 7
Each Porsche 964 manual gearbox uses four of these synchroniser rings, one for 3rd gear, 4th gear, 5th gear and reverse gear. Whether you're carrying out a complete transmission overhaul or replacing worn synchroniser components, this OE Match synchro ring offers factory-style fit, performance and durability.
What Does the Synchro Ring Do?
The synchro ring is a critical wear component within the manual transmission synchroniser assembly.
Its primary functions include:
- Synchronising the rotational speed of the selected gear and gearbox shaft before engagement.
- Allowing smooth, quiet gear changes without gear clash.
- Reducing wear on gear teeth, selector sleeves and synchroniser hubs.
- Improving shift quality and gear engagement.
- Protecting expensive internal gearbox components from premature wear.
- Maintaining the refined shifting performance expected from the Porsche 964 manual transmission.
A correctly functioning synchroniser ring is essential for smooth, accurate and reliable gear changes.
Why Do Synchro Rings Wear Out?
Synchroniser rings are designed to wear gradually during normal operation.
Common causes of wear include:
- High mileage.
- Frequent gear changes.
- Aggressive driving or rapid shifting.
- Worn or contaminated gearbox oil.
- Excessive gearbox temperatures.
- Wear to associated synchroniser hubs and selector sleeves.
- General fatigue of the friction surface over time.
As the friction material wears, the synchroniser becomes less effective at matching gear speeds, leading to more difficult gear selection and increased gearbox wear.
When Should the Synchro Ring Be Replaced?
Replacement is recommended when:
- Gear changes become stiff or notchy.
- Grinding or crunching occurs when selecting gears.
- The gearbox is stripped for overhaul.
- The synchroniser ring shows visible wear or damage.
- Replacing synchroniser hubs, selector sleeves or bearings.
- Rebuilding a high-mileage transmission.
- Preparing a gearbox for fast road or performance use.
Because gearbox disassembly is required, replacing all worn synchroniser rings during a rebuild is considered best practice.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421105
The product you are viewing cross references to these numbers
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 997 GT2 2008-09 6-Speed gearbox (G97.88)
Porsche 997 GT2 RS 2011 6-Speed gearbox (G97.88)
Click 'Zoom in' for large parts diagram.
Diagram Ref no 5
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92830421130
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- Porsche 996 C2 3.4L 1997-08/01
- 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 MKII Turbo 2010-13
Fits:
Porsche 996 Turbo
Porsche 996 GT3
Porsche 997 Turbo MKI & MKII
Click 'Zoom in' for large parts diagram.
Diagram ref no 51
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421124
The product you are viewing cross references to these numbers
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
The OE Match Synchroniser Ring is a replacement manual-transmission synchroniser component for selected Porsche 997 GT2 and GT2 RS models equipped with the G97.88 6-speed manual gearbox.
Price Shown Is For Each.
- Porsche 997 MK1 GT2 2008-09 (6-Speed gearbox (G97.88)
- Porsche 997 MKII GT2 RS 2011 (6-Speed gearbox (G97.88)
Diagram Ref No 5
Installed within the gearbox synchromesh assembly, the synchroniser ring helps match the rotational speeds of the gear and transmission shaft before engagement. This allows the selected gear to engage more smoothly and helps prevent grinding or gear clash.
This OE Match component is suitable for transmission rebuilding and repair where the original synchroniser ring has become worn, glazed, scored or otherwise damaged.
What This Product Does:
During a manual gear change, the gear and shaft involved may be rotating at different speeds.
The synchroniser system uses friction to bring those rotating components to a similar speed before the engagement teeth mesh.
The synchroniser ring helps:
- Match rotational speeds during gear selection
- Promote smooth gear engagement
- Reduce grinding and gear clash
- Reduce shock loading on transmission components
- Protect engagement teeth and synchroniser hubs
- Improve shift quality
- Maintain precise manual gearbox operation
Without effective synchronisation, the driver may need to use more force at the gear lever and the transmission can begin to grind during engagement.
Symptoms Of Wear Or Failure:
Synchroniser rings are friction components and gradually wear through repeated gear changes, heat and load.
Common symptoms can include:
- Grinding during gear selection
- Difficult or reluctant gear engagement
- Notchy gear changes
- Increased effort required at the gear lever
- Gear clash during faster shifts
- Difficulty downshifting
- Gear engaging more easily when shifted slowly
- Improved engagement when double-declutching
- Metallic noise during gear selection
- Inconsistent shift quality
- Visible scoring or glazing on the synchroniser surface
- Worn or damaged engagement surfaces during gearbox inspection
These symptoms can also be caused by worn dog teeth, hubs, sliding sleeves, selector components, bearings, clutch faults or incorrect gearbox oil, so proper diagnosis is important before dismantling the transmission.
Why Replacement Matters:
A worn synchroniser ring cannot match shaft and gear speeds effectively.
As the friction surface deteriorates, gear changes may become increasingly difficult and noisy.
Continued use with a badly worn synchroniser can accelerate wear to:
- Gear engagement teeth
- Synchroniser hubs
- Sliding sleeves
- Dog teeth
- Selector forks
- Associated gearbox components
Replacing the worn ring during a transmission rebuild helps restore smooth synchronisation and can help prevent damage to more expensive gearbox parts.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421130
The product you are viewing cross references to these numbers