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Gearbox Syncro Ring / Brake Band / Dog Teeth
Fits:
Porsche 911 Turbo 1975-76 4 speed
Click "Zoom in" to see the diagram.
Diagram Ref no 48.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030224103
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
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12 Month Warranty
Worldwide Delivery
Dog Teeth 1st Gear (Asymmetrical Teeth)
Restore crisp gear engagement and transmission performance
with this OE Match 1st Gear Dog Teeth Ring, designed for Porsche 911 turbo (930) models produced between
1977 and 1988. Featuring the correct asymmetrical tooth profile used in the
Porsche 930 gearbox, this critical synchroniser component plays a key role in
ensuring smooth and reliable engagement of 1st gear.
Fits:
- Porsche 911 1978-1989 3.3L Turbo (930)
Diagram Ref no 48
Manufactured to OE specifications, this replacement dog teeth ring delivers precise machining, correct fitment and long-lasting durability for gearbox rebuilds, restorations and transmission repairs. Whether you're addressing difficult gear engagement, gearbox wear or carrying out a complete transmission overhaul, replacing worn dog teeth is essential for restoring proper shift quality.
What Do 1st Gear Dog Teeth Do?
The dog teeth ring is a fundamental part of the synchroniser assembly within the Porsche 930 gearbox. Mounted to the gear itself, the dog teeth provide the engagement surface that allows the synchroniser operating sleeve to lock the selected gear to the shaft during a gear change.
Working together with the synchroniser ring, guide hub and
operating sleeve, the dog teeth help:
- Enable smooth gear engagement.
- Synchronise gear speeds before engagement.
- Reduce gear clash during shifting.
- Securely lock 1st gear into operation.
- Improve gearbox performance and shift quality.
- Support reliable transmission operation.
The asymmetrical tooth design used in many Porsche 930 gearbox applications was engineered to improve engagement characteristics and durability under the increased torque loads generated by the turbocharged engine.
Why Do Dog Teeth Fail?
Dog teeth are subjected to repeated mechanical impact every time a gear change is performed. Over time, wear gradually alters the tooth profile, reducing engagement quality and increasing synchroniser stress.
Common causes of failure include:
- High mileage gearbox wear.
- Aggressive shifting techniques.
- Repeated poor gear engagement.
- Worn synchroniser rings.
- Transmission oil contamination.
- Excessive gearbox loading.
- Age-related wear and fatigue.
- Incorrect gearbox setup during previous repairs.
First gear dog teeth are particularly susceptible to wear because they experience frequent engagement from stationary starts and low-speed driving.
When Should 1st Gear Dog Teeth Be Replaced?
Dog teeth should always be carefully inspected whenever the
gearbox is dismantled. Replacement is recommended if you notice:
- Difficulty engaging 1st gear.
- Gear crunching during shifts.
- Jumping out of gear.
- Rounded or hooked tooth profiles.
- Excessive wear on synchroniser components.
- Poor shift quality.
- Visible damage or chipping.
During a professional Porsche 930 gearbox rebuild, worn dog teeth are commonly replaced alongside synchroniser rings, guide hubs and operating sleeves to restore factory shift performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030224102
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
2nd Gear Dog Teeth
Restore precise gear engagement and transmission performance
with this OE Match 2nd Gear Dog Teeth Ring designed for Porsche 911 turbo (930) models produced between 1977
and 1988. As a critical component of the synchroniser assembly, the dog teeth
ring allows smooth and reliable engagement of 2nd gear, helping maintain the
shifting quality and driving characteristics expected from the legendary
Porsche Turbo drivetrain.
Fits:
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1988 3.3L Turbo (930)
Diagram Ref no 35
Manufactured to OE specifications, this replacement dog teeth ring delivers precise machining, excellent durability and factory-correct fitment. Whether you're rebuilding a Porsche 930 gearbox, addressing synchroniser wear or carrying out a full transmission restoration, replacing worn dog teeth is essential for achieving smooth gear changes and long-term gearbox reliability.
What Do 2nd Gear Dog Teeth Do?
The dog teeth ring is mounted directly to the gear and forms an essential part of the Porsche 930 synchroniser system. During a gear change, the synchroniser assembly matches the rotational speed of the selected gear before the operating sleeve engages the dog teeth to lock the gear to the shaft.
The dog teeth perform several vital functions:
- Enable smooth engagement of 2nd gear.
- Provide the engagement surface for the operating sleeve.
- Help synchronise gear speeds during shifting.
- Reduce gear clash and transmission wear.
- Maintain precise gear selection.
- Support reliable gearbox operation under load.
In the high-torque Porsche 930 transmission, properly functioning dog teeth are critical for maintaining shift quality and preventing excessive wear to other synchroniser components.
Why Do 2nd Gear Dog Teeth Fail?
Dog teeth are subjected to repeated impact loads during every gear change. Over time, wear gradually alters the shape of the engagement teeth, reducing their effectiveness and causing shifting issues.
Common causes of failure include:
- High mileage transmission wear.
- Aggressive shifting and rapid gear changes.
- Worn synchroniser rings.
- Poor gearbox lubrication.
- Contaminated transmission oil.
- Excessive drivetrain loading.
- Gear grinding during engagement.
- Age-related wear and fatigue.
Second gear is one of the most frequently used gears during normal driving, making its synchroniser and dog teeth assembly particularly vulnerable to long-term wear.
When Should 2nd Gear Dog Teeth Be Replaced?
The dog teeth ring should always be inspected whenever the
gearbox is dismantled. Replacement is recommended if you notice:
- Difficulty engaging 2nd gear.
- Crunching or grinding during shifts.
- Rounded or hooked engagement teeth.
- Gear engagement becoming increasingly notchy.
- Visible wear, chipping or damage.
- Excessive synchroniser wear.
- Transmission rebuild requirements.
Most Porsche gearbox specialists recommend replacing worn dog teeth during transmission overhauls to restore smooth shifting and protect other synchroniser components from premature wear.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030224200
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
3rd / 4th Gear Dog Teeth
Restore precise shifting performance and gearbox reliability
with this OE Match 3rd / 4th Gear Dog Teeth Ring designed for Porsche 911 Turbo (930) models produced
between 1975 and 1988. As a vital component within the synchroniser assembly,
the dog teeth ring allows smooth engagement of 3rd and 4th gears, helping
maintain the crisp shifting characteristics expected from the legendary Porsche
Turbo transmission.
Fits:
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1988 3.3L Turbo (930)
Diagram Ref no 32 & 34
Manufactured to OE specifications, this replacement dog teeth ring provides accurate machining, correct tooth geometry and exceptional durability for transmission rebuilds, restorations and performance maintenance. Whether you're rebuilding a worn gearbox or restoring a classic Porsche 930 to factory standards, replacing worn dog teeth is essential for preserving smooth gear selection and transmission longevity.
What Do 3rd / 4th Gear Dog Teeth Do?
The dog teeth ring forms an integral part of the Porsche 930 synchroniser assembly. Mounted to the gear, it provides the engagement interface between the gear and the synchroniser operating sleeve.
During a gear change, the synchroniser system matches rotational speeds between components before the operating sleeve engages the dog teeth, locking the selected gear to the shaft and transmitting engine power through the transmission.
The dog teeth help:
- Enable smooth engagement of 3rd and 4th gears.
- Provide positive gear locking during operation.
- Reduce gear clash during shifting.
- Improve gear change precision.
- Support synchroniser operation.
- Maintain reliable gearbox performance under load.
Properly functioning dog teeth are essential for preserving the smooth shift quality and driving enjoyment of the Porsche 930 transmission.
Why Do 3rd / 4th Gear Dog Teeth Fail?
Over time, repeated gear changes gradually wear the engagement surfaces of the dog teeth. As wear increases, gear engagement quality deteriorates and additional stress is placed on the synchroniser assembly.
Common causes of failure include:
- High mileage wear.
- Aggressive driving and fast shifting.
- Worn synchroniser rings.
- Gear grinding during engagement.
- Contaminated gearbox oil.
- Inadequate transmission maintenance.
- Excessive drivetrain loads from turbocharged performance.
- Age-related metal fatigue.
Third and fourth gears often see frequent use during normal road driving and higher-speed operation, making their synchroniser components susceptible to long-term wear.
When Should 3rd / 4th Gear Dog Teeth Be Replaced?
Dog teeth should be inspected whenever the gearbox is
dismantled or rebuilt. Replacement is recommended if you experience:
- Difficulty engaging 3rd or 4th gear.
- Gear crunching or grinding during shifts.
- Rounded, hooked or worn engagement teeth.
- Excessive synchroniser wear.
- Poor shift quality.
- Visible damage or chipping.
- Transmission rebuild requirements.
Most Porsche transmission specialists replace worn dog teeth alongside synchroniser rings, guide hubs and operating sleeves during gearbox overhauls to ensure optimal shifting performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030224300
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
This OE Match synchroniser ring is a direct-fit replacement for the 1st/2nd gear synchro teeth in Porsche G50 (or G-series) manual transmissions. It is built to the correct dimensions, materials, and tolerances for reliable gear engagement and longevity.
Fits:
Porsche 911 / 964 / 965 (1987 - 1994) - G50 - 1st - 2nd Gear
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421010
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 Turbo 1975-88 4 speed
Click 'Zoom in' to see the diagram.
Diagram Ref no 41.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030230100
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 Turbo 1975-88 4 speed
Click "Zoom in" to see the diagram.
Diagram Ref no 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030230300
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
| Synchro Gear Teeth 911 1987-94 3rd-5th Gears |
Fits:
Porsche 911 / 964 / 965 (87-94) - G50 - 3rd - 5th Gear
Manual transmission
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830420910
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 Turbo 1975-88 4 speed
Diagram Ref no 41.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030230100
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 Turbo 1975-88 4 speed
Diagram ref no 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030230300
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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