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Gearbox Syncro Ring / Brake Band / Dog Teeth
Fits:
Porsche 996 Turbo
Porsche 996 GT3
Porsche 997 Turbo MKI & MKII
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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Related, superseded, cross reference or alternative numbers for comparison.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 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
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 997 MKI C2 / C4 2005-08
Click 'Zoom in' to see the diagram.
Diagram Ref no 39.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99730481105
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 (993) (1995-1998) (3rd-6th gear and reverse gear)
Porsche 911 (996) GT2 (2002-2005) (3rd-6th gear)
Porsche 911 (996) GT3 (2000-2005) (3rd-4th gear)
Porsche 911 (996) Turbo / S (2001-2005) (3rd-4th gear)
Porsche 911 (997) GT3 (2010-2011) (6th gear)
Porsche 911 (997) GT3 RS (2011) (6th gear)
Porsche 911 (997) GT3 RS 4.0 (2011) (6th gear)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421123
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 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 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MKII GT3 / GT3 RS 2010-11
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Synchroniser ring is a replacement designed for Porsche manual gearbox applications, ensuring smooth and reliable gear changes. Installed within the transmission’s synchromesh hub assembly, this ring facilitates the engagement of gears by matching rotational speeds before meshing, thereby eliminating grinding and excessive wear. Built to match Porsche’s original specification.
Sold each
Fits:
Porsche 911 (993) (1995-1998) (3rd-6th gear and reverse gear)
Porsche 911 (996) GT2 (2002-2005) (3rd-6th gear)
Porsche 911 (996) GT3 (2000-2005) (3rd-4th gear)
Porsche 911 (996) Turbo / S (2001-2005) (3rd-4th gear)
Porsche 911 (997) GT3 (2010-2011) (6th gear)
Porsche 911 (997) GT3 RS (2011) (6th gear)
Porsche 911 (997) GT3 RS 4.0 (2011) (6th gear)
• Position: Inside manual transmission, synchromesh ring for one of the gear sets (often 3rd/4th gear or 5th/6th depending on the gearbox).
• Function: Enables gear engagement by synchronising shaft speeds, preventing gear-grinding, facilitating smooth shifts and protecting gear teeth and synchroniser hubs.
• Applications: Ideal when the transmission is open for rebuild, when synchroniser wear is apparent (hard or noisy shifts, grinding) or when restoring a Porsche manual gearbox to high performance.
The synchroniser ring is key to proper manual gearbox operation. Over time, wear, heat and load cause the sliding surfaces to glaze or the ring teeth to degrade, leading to symptoms such as gear clash, difficult shifts, poor gear engagement or even damage to gear teeth and hubs. Replacing the synchroniser ring ensures:
• Smooth, reliable gear engagement
• Reduced gear-grinding and longer synchroniser life
• Protection for the gearbox internals from further wear
• Enhanced driving experience and drivetrain reliability
When to replace:
• The gearbox exhibits grinding when changing into a specific gear or range (often 3rd/4th or 5th/6th)
• Hard gear changes, slipping, or noise from the transmission under load
• Internal inspection shows wear or scoring on the old synchroniser ring surfaces
• You’re rebuilding the gearbox or performing a major service where opening the transmission is already necessary.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421123
The product you are viewing cross references to these numbers
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 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 GT2 2001-05
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MKII GT3 / GT3 RS 2010-11
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12 Month Warranty
Worldwide Delivery
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421130
The product you are viewing cross references to these numbers
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
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12 Month Warranty
Worldwide Delivery
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
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT2 RS 2011-13
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 997.1 Carrera 2005-08 with Manual Gearbox G9701 / G9731
Click 'Zoom in' for large parts diagram.
Diagram ref no 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99730421102
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Shop Securely
12 Month Warranty
Worldwide Delivery
Porsche Gearbox Synchro Rings, Brake Bands & Dog Teeth | Precision Shifting Components for Smooth Gear Engagement
Synchro rings, brake bands, and dog teeth are essential components in your Porsche’s gearbox, designed to ensure smooth, precise, and quick gear changes. These parts allow gears to match speed before engagement, preventing grinding, wear, and missed shifts — maintaining the refined driving feel expected from every Porsche.
At Design911, we supply high-quality synchro rings, brake bands, and dog teeth engineered to meet or exceed original performance specifications. Manufactured from precision-cut steel alloys and hardened friction materials, these components are built for strength, durability, and seamless operation under both road and performance driving conditions.
Whether you’re rebuilding a classic Porsche transmission, maintaining a daily driver, or preparing a track-ready gearbox, our synchro and engagement components restore smooth shifting and reliability.
What Do Synchro Rings, Brake Bands & Dog Teeth Do?
These precision-engineered parts are responsible for synchronising gear speeds and ensuring positive engagement during shifting.
Core Functions:
- Synchro
Rings: Match rotational speeds between gears before engagement.
- Brake
Bands: Control the friction needed to synchronise gears efficiently.
- Dog Teeth: Engage the synchro hub with the selected gear to complete the shift.
Together, they allow seamless transitions between gears, reducing shock loads on the gearbox and ensuring crisp, responsive shifting across all driving conditions.
Why Do Synchro Rings, Brake Bands & Dog Teeth Fail or Wear Out?
These components are subject to extreme friction, pressure, and heat with every gear change. Over time, constant use and lubrication breakdown cause material fatigue and reduced performance.
Common Causes of Failure Include:
- Friction surface wear on synchro rings due to age or low-quality lubricant.
- Deformation or breakage of dog teeth from aggressive shifting.
- Worn brake bands leading to poor gear synchronisation.
- Contaminated gearbox oil reducing friction control.
- Heat stress from performance driving or clutch drag.
When these parts wear out, symptoms include gear crunching, resistance when shifting, missed gears, or grinding noises — clear signs it’s time for replacement.
Why Replace Your Porsche Gearbox Synchro Rings, Brake Bands & Dog Teeth?
Replacing worn synchroniser components restores precise gear changes, prevents gearbox damage, and extends transmission lifespan. Upgrading to performance or reinforced designs enhances engagement speed and consistency — ideal for high-performance or track-driven Porsches.
Key Benefits:
- Restores smooth, accurate gear changes.
- Eliminates gear crunching, grinding, and engagement delay.
- Prevents gearbox wear and protects internal components.
- Ensures reliable shifting under load or high-speed driving.
- Available for Porsche 911, Cayman, Boxster, and classic models.
- Suitable for gearbox rebuilds, restorations, or performance upgrades.
During gearbox servicing, it’s highly recommended to replace synchro rings, brake bands, and dog teeth as a complete set to ensure balanced wear and consistent operation.
Highlights
- Premium Porsche synchro rings, brake bands, and dog teeth.
- Designed for smooth, precise, and durable gear engagement.
- Heat-treated and precision-machined for longevity.
- Direct-fit replacements for all Porsche gearbox types.
- Ideal for manual transmission rebuilds and performance upgrades.
- Restores shifting quality and transmission reliability.
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Saturday: Closed
Sunday: Closed