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Gearbox Syncro Ring / Brake Band / Dog Teeth
By OE Match
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 914 (1970-1976)
Sold each.
Fits:
Porsche 911 1965-71 (1. - 5th gear)
Porsche 911 1972-86 (3. - 5th gear)
Porsche 914 1970-76 (1. - 5th gear)
Porsche 924 1976-85 (4. - 5th gear)
Click 'Zoom in' for large parts diagram.
Diagram ref no 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91130231101
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
The OE Match 1st Gear Dog Teeth is a high-quality replacement gearbox component designed for Porsche manual transmissions. Manufactured to OE specifications for fit, precision and durability, this component forms a critical part of the gear engagement mechanism, allowing smooth and secure engagement of first gear during operation.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
Diagram Ref No 43
The dog teeth ring is fitted to the gear assembly and works in conjunction with the synchroniser hub, synchroniser ring and selector sleeve. It provides the engagement points that lock the selected gear to the transmission shaft, ensuring efficient transfer of engine power through the gearbox. Precision machining is essential for smooth shifting performance and long transmission service life.
What This Product Does:
- Provides the engagement surface for first gear selection.
- Works with the synchroniser assembly to enable smooth gear changes.
- Locks first gear to the transmission shaft when selected.
- Ensures efficient transfer of engine power through the gearbox.
- Supports accurate and reliable gear engagement.
- Helps minimise transmission wear during shifting.
- Contributes to smooth manual gearbox operation.
Symptoms Of Wear Or Failure:
- Difficulty engaging first gear.
- Gear crunching or grinding during gear selection.
- First gear jumping out of engagement under load.
- Increased resistance when shifting into first gear.
- Poor shift quality or inconsistent engagement.
- Excessive transmission noise during gear changes.
- Visible wear, rounding or chipping of the dog teeth during inspection.
- Premature wear of related synchroniser components.
Why Replacement Matters:
- Dog teeth are subjected to repeated engagement loads every time a gear is selected. Over time, the engagement surfaces can become worn, rounded or damaged, particularly in high-mileage transmissions or vehicles subjected to aggressive shifting. As wear progresses, gear engagement becomes increasingly difficult and less precise.
- A worn dog teeth ring can compromise synchroniser performance and may eventually prevent proper engagement of first gear. Continued operation with worn components can accelerate wear of synchroniser hubs, selector sleeves and other transmission parts, leading to more extensive and costly gearbox repairs.
- Replacing worn first gear dog teeth restores precise gear engagement, improves shift quality and helps protect the transmission from further internal wear. An OE Match replacement provides factory-style fitment, accurate machining and long-term durability, ensuring reliable gearbox operation and preserving the driving experience expected from your Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530224114
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Fits:
Porsche 911 2.4 / 2.7 1972 - 1976
for 915-gearbox symmetric
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530224100
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Dog teeth 1st gear. Porsche 911 & 912 1965-71, 1st Gear with 4-Speed 2 slots in hub
Fits:Porsche 911 1965-71
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90230224104
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Dog Teeth 911,912 1965-71, 914 All 1st Gear with 5-Speed transmission only, 2 slots in hub
Sold individually
Fits:
Porsche 911 1965 - 1971
Porsche 914 All 1st Gear with 5-Speed
The dog teeth ring forms part of the gearbox synchroniser assembly. It works with the synchro ring, operating sleeve, and gear hub to allow the selected gear to engage smoothly. On 1st gear, the dog teeth are critical for clean gear selection, especially during low-speed driving, manoeuvring, and gearbox operation from rest.
Functions
• Replaces the 1st gear dog teeth ring
• Helps restore correct 1st gear engagement
• Works with the synchro ring and operating sleeve
• Supports smoother gear selection
• Helps reduce crunching, baulking, or poor shift feel
• Suitable for gearbox rebuilds and synchroniser repairs
• OE Match replacement for classic Porsche transmission service.
Why Replace This Part?
Dog teeth can wear, chip, round off, or become damaged through age, high mileage, poor lubrication, worn synchro parts, or aggressive gear changes. Worn 1st gear dog teeth may cause difficult gear engagement, crunching, jumping out of gear, or poor shift quality. Replacing the dog teeth during gearbox overhaul helps restore reliable synchroniser operation and smoother 1st gear selection.
When to Replace This Part
• 1st gear is difficult to select
• Crunching or baulking occurs when engaging 1st gear
• The gearbox jumps out of 1st gear
• The dog teeth are chipped, rounded, worn, or damaged
• The synchro ring or operating sleeve is being replaced
• The gearbox is being rebuilt or inspected
• Preventative replacement is being carried out during transmission overhaul
Where it fits on the car
This dog teeth ring fits inside the gearbox on the 1st gear synchroniser assembly. It forms part of the internal gear engagement system and should be installed according to the factory gearbox layout.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90130224106
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
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)
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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
G901 2rd to 5th Gear,
G915 3rd to 5th Gear
Manual transmission gear teeth are precision-engineered ridges on the gears inside a manual gearbox. These teeth interlock to transfer power from the engine to the driveshaft. Their exact shape and alignment ensure smooth gear engagement, efficient torque delivery, and dependable performance across all gear ratios. Keeping the gear teeth strong and undamaged is crucial for preventing slippage, maintaining power, and extending the overall life of the transmission.
Fits:Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera (915 Gearbox)
Porsche 911 1978-1983 3.0L / SC (915 Gearbox)
Porsche 911 1984-1986 3.2L (915 Gearbox)
Signs of Manual Transmission Gear Teeth Failure
- Grinding or whining noises during shifting, often caused by worn or damaged teeth.
- Difficulty engaging gears due to misaligned or broken gear teeth.
- Loss of power or gear slippage when the teeth can no longer mesh correctly.
Diagram Ref no 6, 15, 23.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90130224203
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)
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 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Fits:
Porsche 911 1972-77 915 Manual Transmission
not for 915/60/61 gearboxes
Click 'Zoom in' for large parts diagram.
Diagram ref no 42
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530241100
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
Manual transmission Synchro / Brake Band (Synchroniser band) engineered to match Porsche’s original specifications. Provides friction control during gear synchronisation, allowing smooth and quiet gear changes.
Fits:
Porsche 911 1974 - 1986 (915 Gearbox)
Diagram ref no 37
The synchro / brake band is part of the gearbox synchroniser system, helping to slow or control rotation of a gear or hub during shift transitions, promoting smooth engagement and preventing clash. It works in concert with the synchroniser rings, hubs, sleeves, and gearsets to align speeds of rotating parts before lock-in. Proper material, friction surface, and design are critical — the band must provide the correct friction characteristics without binding or excessive wear.
• Installation: Direct OE replacement — recommended during gearbox overhaul
• Position / Location: This part is located inside the manual transmission, within the synchroniser assembly — the mechanism that equalizes gear and shaft speeds for smooth engagement. It wraps around the synchroniser hub and works with the synchro ring and dog teeth gear to provide friction and control during shifting.
• Benefits: Restores synchroniser performance, eliminates grinding, reduces wear on gears and rings
Why replacement matters:
• With use, the original band’s friction surfaces can glaze, wear, or lose consistency, impairing its ability to slow or stabilise gear/hub motion during shifting.
• A worn or ineffective brake / synchro band can result in grinding gears, missed shifts, or gear clash, especially under load or during aggressive shifting.
• Installing a high-quality replacement restores proper friction behaviour, enabling smooth engagement, reducing wear on adjacent synchroniser elements, and extending transmission life.
• Because the transmission internals are sensitive to mismatches or degraded components, having a reliable replacement band ensures system integrity and maintains the “feel” of the gearbox.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830231908
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
The OE Match 2nd Gear Synchro Brake Band is a high-quality replacement transmission component designed to ensure smooth and precise engagement of second gear in Porsche manual gearboxes. Manufactured to OE specifications for fit, accuracy and durability, this brake band forms an integral part of the synchroniser assembly, helping to equalise gear speeds before engagement occurs.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
Diagram Ref No 39
Working alongside the synchroniser ring, dog teeth, synchroniser hub and selector sleeve, the synchro brake band creates the friction required to slow or accelerate rotating gearbox components, allowing second gear to engage smoothly and efficiently. Precision engineering ensures reliable gear synchronisation, improved shift quality and reduced wear on internal transmission components.
What This Product Does:
- Assists in synchronising gear speeds before second gear engagement.
- Works as part of the transmission synchroniser assembly.
- Helps provide smooth and accurate gear changes.
- Reduces gear clash and grinding during shifting.
- Supports proper operation of the synchroniser ring and hub.
- Minimises wear on transmission engagement components.
- Contributes to reliable manual gearbox performance.
Symptoms Of Wear Or Failure:
- Difficulty engaging second gear.
- Gear grinding or crunching when shifting into second.
- Increased resistance during gear changes.
- Notchy or inconsistent shift quality.
- Requirement to shift slowly to avoid gear clash.
- Excessive gearbox noise during gear engagement.
- Poor synchronisation between gear and shaft speeds.
- Accelerated wear of synchro rings, dog teeth and selector sleeves.
Why Replacement Matters:
- The synchro brake band is subjected to constant friction and wear every time second gear is selected. Over time, the friction surfaces can wear down, reducing the component's ability to equalise rotational speeds before gear engagement. This can result in difficult shifting, gear clash and increased stress on other synchroniser components.
- A worn brake band can compromise synchroniser performance and accelerate wear throughout the gearbox. If left unresolved, continued operation may lead to damage of synchro rings, dog teeth and selector sleeves, potentially resulting in more extensive and costly transmission repairs.
- Replacing a worn synchro brake band restores proper synchronisation, improves shift quality and helps protect the gearbox from premature internal wear. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring smooth and dependable transmission operation for your Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830231801
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
This OE Match synchro brake band is a replacement transmission synchroniser component used on Porsche 911 models fitted with the 915 gearbox. It is designed for the 3rd, 4th, and 5th gear synchroniser assembly and matches the original-style fit and function.
3 per gearbox. *please note: these are 1/2 pieces so order 2 pcs to make one complete brake band
Fits:
Porsche 911 1974 - 1986 (915 Gearbox)
Diagram ref no 8.
This brake band fits inside the 915 manual gearbox, within the synchroniser assembly for 3rd, 4th, and 5th gear. It is an internal transmission component and is accessed during gearbox disassembly or synchroniser service.
The synchro brake band works as part of the gearbox synchroniser system. During gear changes, it helps control and equalise the speed of the gear and synchroniser hub before engagement. This allows the gear to engage more smoothly and helps reduce grinding, baulking, or difficult shifting.
Functions
• Supports smooth gear engagement in the 915 gearbox
• Helps synchronise gear speed during shifting
• Reduces gear clash, grinding, and shift resistance
• Works with the synchro ring, anchor block, energiser block, and operating sleeve
• Helps restore correct shift quality in worn gearbox assemblies
• Provides an OE Match replacement for the original brake band
• Suitable for gearbox rebuilds and synchroniser repairs
Why Replace This Part?
The synchro brake band is subject to wear every time the gearbox is shifted. Over time, it can become worn, distorted, cracked, or weakened, which may lead to poor synchroniser performance. A worn brake band can contribute to grinding gears, difficult engagement, or a notchy shift feel, especially in higher gears. Replacing it during gearbox service helps restore smoother gear changes and supports long-term transmission reliability.
When to Replace:
• The gearbox is grinding when selecting 3rd, 4th, or 5th gear
• Gear changes feel notchy, stiff, or difficult
• The transmission baulks or resists engagement
• The 915 gearbox is being rebuilt or inspected
• The synchroniser ring or operating sleeve is being replaced
• The brake band is worn, cracked, bent, or damaged
• There is excessive wear in the synchroniser assembly
• As preventative replacement during a full gearbox overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91130231608
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
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 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
The OE Match 1st Gear Synchro Ring is a high-quality replacement transmission component designed to facilitate smooth and precise engagement of first gear in Porsche manual gearboxes. Manufactured to OE specifications for fit, accuracy and durability, this synchroniser ring forms a critical part of the gearbox synchronisation system, helping to match gear and shaft speeds before engagement occurs.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
Diagram Ref No 39
Working alongside the synchroniser hub, dog teeth and selector sleeve, the synchro ring reduces speed differences between rotating gearbox components, allowing gears to engage smoothly without excessive noise, grinding or wear. Precision engineering ensures reliable operation and helps maintain the shift quality expected from a Porsche transmission.
What This Product Does:
- Synchronises rotational speeds before first gear engagement.
- Helps ensure smooth and precise gear changes.
- Reduces gear clash and grinding during shifting.
- Works with the synchroniser assembly and dog teeth.
- Improves transmission shift quality and drivability.
- Minimises wear on gearbox engagement components.
- Supports reliable operation of the manual transmission.
Symptoms Of Wear Or Failure:
- Difficulty selecting first gear.
- Gear grinding or crunching during engagement.
- Increased resistance when shifting into first gear.
- Notchy or inconsistent gear changes.
- Requirement to force the gear lever into position.
- Excessive gearbox noise during shifting.
- Premature wear of dog teeth and related synchroniser components.
- Poor shift quality, particularly when the gearbox is cold.
Why Replacement Matters:
- Synchroniser rings are subjected to constant friction and wear every time a gear is selected. Over time, the friction surfaces can wear down, reducing their ability to equalise rotational speeds effectively before gear engagement. This can lead to difficult gear selection, increased transmission noise and accelerated wear of surrounding gearbox components.
- A worn synchro ring can place additional strain on dog teeth, selector sleeves and synchroniser hubs, potentially leading to more extensive and expensive gearbox repairs if left unresolved. Poor synchronisation can also diminish driving enjoyment and compromise the smooth operation of the transmission.
- Replacing a worn first gear synchro ring restores proper synchronisation, improves shift quality and helps protect the transmission from further internal wear. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring smooth and reliable gearbox performance for your Porsche.
Related reference numbers
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91530230113
The product you are viewing cross references to these numbers
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gears and shafts 4. speed transmission - G 930/34 - 911 1978-83 303-05
-
gears and shafts 5. speed transmission - G 915 - 911 1978-83 303-15
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gears and shafts 4-speed gear wheel sets see group 3/03/00 303-05
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Gear wheel sets 5-speed transmission for 911 1972 ONWARDS 303-10
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Gears and shafts 4-speed transmission for 911 E/S UPTO 1970 and 911 T UPTO 1971 303-25
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Gear wheel sets 4-speed transmission for 1972 ONWARDS 303-30
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gears and shafts SPM - G 925/16 - 911 1978-83 309-05
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gears and shafts 4-speed 911 1984-86 303-05
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gears and shafts 5-speed 911 1984-86 303-15
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Gear wheel sets 4-speed 911 1974-77 303-00
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Gears and shafts 4-speed - Model 915 - 911 1974-77 303-05
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Gear wheel sets 5-speed 911 1974-77 303-10
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Gears and shafts 5 speed - Models: TYP 915 / TYP 923 - 911 1974-77 303-15
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Gears and shafts 911 1974-77 SPM 309-05
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gears and shafts 5-speed transmission for 911 UPTO 1971 303-05
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Gears and shafts 5-speed transmission (gear wheel sets 915.300/02) for 911 1972 onwards 303-15
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gears and shafts 4-speed transmission for 911 1972 ONWARDS 303-35
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gears and shafts sportomatic for 911 1972 ONWARDS 308-15
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gears and shafts 5-speed transmission 911 1965-69 303-05
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gears and shafts 4-speed transmission 911 1965-69 303-15
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gears and shafts sportomatic 911 1965-69 308-05
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gear wheel sets 911 TURBO 1975-77 303-05
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gears and shafts 308-05
OEMatch Gearbox Syncro Ring / Brake Band / Dog Teeth — Engagement, Smoothness, Control
OEMatch gearbox synchroniser parts are practical replacements designed for Porsche models. Synchro rings, brake bands and dog teeth restore accurate gear engagement during a rebuild or repair, reduce grinding and improve shift clarity. These items are chosen for compatibility with model-specific transmission layouts and common Porsche gearbox applications.
Available Types
- Synchro rings for specific gearsets and ratios
- Brake bands sized for particular Porsche manual transmissions
- Dog rings and dog teeth for hub engagement and selector assemblies
Understanding OEMatch Gearbox Syncro Ring / Brake Band / Dog Teeth
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original gearbox synchroniser parts.
OE (Original Equipment) refers to parts matching original specifications for the gearbox synchroniser parts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM gearbox synchroniser parts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Synchroniser rings, brake bands and dog teeth coordinate rotational speed and positive engagement between gears; correct selection and installation support consistent shift feel and reduce the risk of incidental damage during use or rebuild. Material choice and heat treatment affect wear rates and contact behaviour, so matching part type to the transmission model is important.
Benefits Include
- Restores synchronisation to reduce gear noise and grinding
- Protects adjacent gearbox components by ensuring controlled engagement
- Helps maintain consistent shift effort across gears and driving conditions
Why Gearbox Syncro Ring / Brake Band / Dog Teeth Wear and Fail
- Friction surface wear from age, contamination or degraded lubricant
- Deformation or chipping of dog teeth due to aggressive shifting or impact
- Heat stress and inadequate lubrication during high-load operation
The Importance of Replacing with OEMatch Gearbox Syncro Ring / Brake Band / Dog Teeth
Replacing worn synchroniser components as part of a transmission rebuild or service reduces the likelihood of further gearbox damage and helps retain intended shift characteristics. Using parts matched to the Porsche transmission maintains mechanical clearances and engagement timing, supporting dependable operation and reducing the chance of secondary failure.
Advantages
- Replacements sized for common Porsche transmission types to aid fitment
- Heat-treated and machined materials for consistent contact behaviour
- Suitable for restorations, routine servicing and compatible performance upgrades
Support & Advice
Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. If you are unsure about setup, condition or backlash settings, consult a specialist with Porsche experience.
