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Gearbox Syncro Ring / Brake Band / Dog Teeth
Fits:
Porsche 996 C2 / C4 1998-05 (G96.00/30 G96.01/30) 6-Speed Manual Transmission
Porsche 986 Boxster S 1997-04 (G86.20) 6- and 5-speed Manual transmission
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630404100
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 996 C2 / C4 1998-05 (G96.00/30 G96.01/30) 6-Speed Manual Transmission
Porsche 986 Boxster S 1997-04 (G86.20) 6- and 5-speed Manual transmission
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630404100
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 996 C2 / C4 1998-05 (G96.00/30 G96.01/30) 6-Speed Manual Transmission
Porsche 986 Boxster S 1997-04 (G86.20) 6- and 5-speed Manual transmission
Click 'Zoom in' for large parts diagram.
Diagram ref no 17
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630404101
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 996 C2 / C4 1998-05 (G96.00/30 G96.01/30) 6-Speed Manual Transmission
Porsche 986 Boxster S 1997-04 (G86.20) 6- and 5-speed Manual transmission
Click 'Zoom in' for large parts diagram.
Diagram ref no 17
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630404101
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
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12 Month Warranty
Worldwide Delivery
Fits:
All 6 Speed Manual Gearbox
Porsche 986 Boxster S 2000>>
Porsche 996 C2 / C4 1998-05
Click 'Zoom in' for large parts diagram.
Diagram Ref No. 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030461720
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
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OE Match-quality synchronizer ring (synchro ring) - designed for use inside the manual transmission gearbox of various Porsche 6-speed models. It is engineered to meet the original Porsche specification, providing a direct-fit, high-precision replacement part for smooth gear engagement.
Sold each.
Fits:
All 6 Speed Manual Gearbox
Porsche 986 Boxster S 2000 - 2005
Porsche 996 C2 / C4 1998 - 2005
Diagram Ref No. 3
The synchronizer ring (also called a synchro ring) helps smoothly engage gears during shifting - especially between 1st and 2nd gears - by matching the rotational speeds of the gears and shafts before the gear teeth mesh. This prevents gear grinding, reduces wear, and provides a more refined shifting feel. If a synchronizer ring becomes worn or damaged, you may experience rough shifts or difficulty selecting gears.
Function
• Speed Matching: Helps equalize speeds of the gear and shaft before engagement.
• Friction Control: Uses friction material surfaces to slow or speed parts for smooth engagement.
• Shift Quality: Promotes quieter, smoother shifting with reduced gear clash.
• Gearbox Protection: Reduces wear on gears and synchro components by facilitating correct engagement.
Synchro rings are subject to wear over time, especially under regular spirited driving or heavy use. Worn synchro rings can lead to:
• Gear grinding when shifting
• Difficult gear engagement
• Increased transmission wear Harsh or noisy shifts
Replacing a worn synchronizer ring with an OE Match part restores intended gearbox function, improves shift quality, and helps protect other internal transmission components from accelerated wear.
Replace this synchronizer ring if you experience:
• Grinding or crunching when shifting between gears
• Difficulty selecting certain gears
• Gear shifts that feel stiff or reluctant
• Noisy transmission operation during shifts
• Symptoms during gearbox rebuild or overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030461720
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 986 Boxster S 2000-04 6-Speed Manual
Porsche 996 C2/C4 1998-01 6-speed Manual
Click 'Zoom in' for large parts diagram.
Diagram ref no 4
Price is for each.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630461320
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
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12 Month Warranty
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Fits:
Porsche 996 (6 speed) 1998 model only 6 teeth for 1st/2nd gears
Click 'Zoom in' for large parts diagram.
Diagram Ref No. 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030461120
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
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12 Month Warranty
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The OE Match Synchro Cone Ring is a replacement manual-transmission synchroniser component for the 1st and 2nd gear synchromesh assembly on selected Porsche 986 Boxster S and 996 Carrera models.
Fits:- Porsche Boxster S 986 3.2L 2000-02 (6-Speed Manual)
- Porsche Boxster S 986 3.2L 2003-04 (6-Speed Manual)
- Porsche 996 C2 3.4L 1997-08/01 (6-Speed Manual)
- Porsche 996 C4 3.4L 1997-08/01 (6-Speed Manual)
Diagram Ref No 4
Located inside the gearbox, the cone ring uses friction to help equalise the rotational speed of the selected gear and transmission shaft before the engagement components lock together.
This process is essential for smooth gear selection and helps prevent grinding, crunching and excessive shock loading during shifts.
The OE Match replacement is suitable for gearbox rebuilding or repair where the original cone ring has become worn, glazed, scored or otherwise unable to provide effective synchronisation.
What This Product Does:
When the driver changes gear, the selected gear and transmission shaft may be rotating at different speeds.
Before the gear can engage cleanly, the synchroniser assembly must bring those speeds together.
The synchro cone ring helps:
- Synchronise rotational speeds before gear engagement
- Support smooth selection of 1st and 2nd gear
- Reduce crunching and gear clash
- Reduce shock loading during gear changes
- Protect the operating sleeve and engagement teeth
- Improve gear-change precision
- Reduce the effort required to select a gear
- Maintain reliable manual transmission operation
The cone ring works as part of a complete synchroniser assembly rather than operating independently. Correct operation also depends on the condition of the synchroniser rings, guide sleeve, dog teeth, gears and selector components.
Symptoms Of Wear Or Failure:
Common symptoms of a worn 1st/2nd gear synchro cone ring can include:
A worn synchroniser system may also be associated with 2nd gear pop-out, but this symptom should not automatically be attributed to the cone ring alone. The guide sleeve, gear engagement teeth, synchroniser rings, selector mechanism and other gearbox components may also contribute.
Why Replacement Matters:
A worn cone ring cannot synchronise the selected gear quickly enough before engagement.
If the gearbox continues to be used with poor synchronisation, repeated gear clash can accelerate wear to other transmission components.
Potential secondary damage can affect:
- Gear engagement teeth
- Dog teeth
- Guide / operating sleeve
- Synchroniser rings
- Selector components
- Gear wheels
- Associated transmission parts
Replacing a worn cone ring as part of a correctly diagnosed gearbox repair helps restore smooth synchronisation and can prevent further deterioration of more expensive components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630461320
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 996 (6 speed) 1998 model only 6 teeth for 1st/2nd gears
Diagram Ref No. 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030461120
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 986 Boxster S 2000-04 (6 speed)
Porsche 996 (6 speed) 1999>> 7 teeth for 1st/2nd gears
Click 'Zoom in' for large parts diagram.
Diagram Ref No. 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630461100
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 986 Boxster S 2000-04 (6 speed)
Porsche 996 (6 speed) 1999>> 7 teeth for 1st/2nd gears
Diagram Ref No. 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630461100
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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Shop Securely
12 Month Warranty
Worldwide Delivery
Sold each.
Fits:
All 6 Speed Manual Gearbox
Porsche 986 Boxster S 2000>>
Porsche 996 C2 / C4 1998-05
Click 'Zoom in' for large parts diagram.
Diagram Ref No. 5
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Shop Securely
12 Month Warranty
Worldwide Delivery
Sold each.
Fits:
All 6 Speed Manual Gearbox
Porsche 986 Boxster S 2000>>
Porsche 996 C2 / C4 1998-05
Diagram Ref No. 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630441100
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 (993) RS 1995 (M003)
Porsche 996
Porsche 986 S
Click 'Zoom in' for large parts diagram.
Diagram ref no 33
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030461111
The product you are viewing cross references to these numbers
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 993 (911) RS 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- 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
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12 Month Warranty
Worldwide Delivery
Fits all Porsche 996 and Boxster S 986 transmissions. G86/20, G96/00, G96/01, G96/30, G96/31
Replaces part 996.302.296.00
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99630229600
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
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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.
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed