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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 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
This synchroniser ring that fits into the 915 gearbox of a Porsche 911. Its role is to match the rotational speed of a gear to the shaft before the dog teeth engage, enabling grind-free shifting, especially into 2nd gear.
Fits:
Porsche 911 2nd Gear Only 1974 - 1986 (915 Trans.)
Porsche 912E 1st-2nd Gears 1972 - 1976
Diagram Ref no 39.
• Function: The synchroniser ring helps match the speed of the transmission shaft and gear before engagement, enabling smooth shifting without gear clash.
• Position: Located inside the 915 manual gearbox, specifically associated with 1st/2nd gear synchronising assembly (diagram ref no 39)
• Benefit: Restores precise gear changes, reduces shifting effort, prevents gearbox noise or damage
Over time, the synchroniser ring’s friction surfaces wear, reducing its ability to align gear speeds. This can lead to gear grinding, difficulty selecting 2nd gear, or “pop-out” under load.
When to replaces:
• During a gearbox overhaul or rebuild of a 915 transmission.
• If you experience gear grinding, hard 2nd gear shifts, or gear pop-out.
• When you’re replacing other major gearbox components - installing a new synchro ring ensures correct engagement and long transmission life.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530230114
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 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 914 (1970-1976)
The OE Match Synchro Ring is a high-quality replacement transmission component designed for use in 3rd, 4th and 5th gear positions within Porsche manual gearboxes. Manufactured to OE specifications for fit, precision and durability, this synchroniser ring plays a critical role in ensuring smooth and accurate gear changes by matching gear and shaft speeds before engagement.
Fits:
- 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 914 (1970-1976)
Diagram Ref No 10
Working in conjunction with the synchroniser hub, selector sleeve and dog teeth, the synchro ring uses friction to equalise rotational speeds between transmission components, allowing gears to engage smoothly and reducing wear on the gearbox. Three synchro rings are typically required per gearbox, one for each applicable gear position.
What This Product Does:
- Synchronises gear and shaft speeds before engagement.
- Enables smooth selection of 3rd, 4th and 5th gears.
- Reduces gear clash and grinding during shifting.
- Works with the synchroniser assembly and dog teeth.
- Improves gearbox shift quality and drivability.
- Minimises wear on transmission engagement components.
- Supports reliable and efficient manual gearbox operation.
Symptoms Of Wear Or Failure:
- Difficulty engaging 3rd, 4th or 5th gear.
- Gear grinding or crunching during gear changes.
- Increased resistance when shifting.
- Notchy, inconsistent or rough gear engagement.
- Requirement to force the gear lever into gear.
- Excessive transmission noise during shifting.
- Poor shift quality, especially at higher engine speeds.
- Accelerated wear of dog teeth, selector sleeves and related components.
Why Replacement Matters:
- Synchroniser rings are wear items that experience friction every time a gear is selected. Over time, the friction surfaces wear down, reducing their ability to equalise gear speeds before engagement. This can result in difficult gear selection, noisy shifts and increased wear throughout the transmission.
- A worn synchro ring places additional stress on dog teeth, selector sleeves and synchroniser hubs, potentially leading to more extensive gearbox damage and expensive repairs if left unattended. Reduced synchronisation can also detract from driving enjoyment and compromise the smooth operation expected from a Porsche manual transmission.
- Replacing worn synchro rings restores proper synchronisation, improves gear change quality and helps protect other internal gearbox components from premature wear. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring dependable transmission performance and smooth gear engagement.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91130230113
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
| 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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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 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) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
1st & 2nd Gear Synchro Ring
Sold each - 2 required per car
Restore precise gear selection and smooth shifting with this
OE Match 1st & 2nd Gear Synchro Ring. Manufactured to replicate the original factory
specification, this direct replacement on G50 manual transmissions, helping to restore crisp gear
engagement and prolong gearbox life.
Fits:
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1 1989 3.3L Turbo (930) G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Diagram Ref no 32
Whether you're carrying out a complete transmission rebuild or replacing worn synchroniser components, this OE Match synchro ring delivers the fit, function and reliability expected from an original-style replacement.
What Does the Synchro Ring Do?
The synchro ring is one of the most important wear components inside the manual gearbox.
Its primary functions include:
- Matching the rotational speed of the selected gear and the gearbox shaft before engagement.
- Allowing smooth gear changes without gear clash.
- Reducing wear on gear teeth and engagement hubs.
- Improving shift quality and driver confidence.
- Helping protect internal gearbox components from excessive wear.
A correctly functioning synchro ring is essential for the smooth, precise shift quality that Porsche G50 gearboxes are known for.
Why Do Synchro Rings Fail?
Synchroniser rings are designed as wear components and gradually lose effectiveness through normal operation.
Common causes of failure include:
- Normal wear from repeated gear changes.
- Aggressive or high-performance driving.
- High mileage. Poor lubrication or degraded gearbox oil.
- Excessive heat generated within the transmission.
- Incorrect shifting techniques causing premature wear.
As the friction surface wears, the synchroniser can no longer effectively match gear speeds, resulting in increasingly difficult gear engagement.
When Should They Be Replaced?
Replacement is recommended when:
- First or second gear becomes difficult to engage.
- Gear changes produce grinding or crunching noises.
- The gearbox jumps out of gear under load.
- Shift quality deteriorates, particularly when cold.
- Carrying out a complete gearbox overhaul.
- Replacing worn synchroniser hubs, sleeves or bearings.
- Rebuilding a high-mileage or performance transmission.
As gearbox disassembly is required, replacing synchro rings alongside other wear components is considered best practice during a transmission rebuild.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95030431102
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)
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 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Synchro Ring – G50 5-Speed Gearbox
Restore the precise gear changes your Porsche was engineered
to deliver with this OE Match Synchro Ring for the Porsche 911 G50 5-speed
manual gearbox (1987-1989). Manufactured to replicate the original
factory specification, this is precision engineered to provide smooth, accurate
synchronisation between gears, helping eliminate gear clash and restore crisp
shifting performance.
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1989 3.3L Turbo G50
Diagram Ref no 7
Designed for use during gearbox rebuilds or transmission
repairs, this OE Match synchroniser ring is manufactured from high-quality
materials to ensure consistent friction characteristics, long service life and
reliable operation. Whether you're restoring a road car or rebuilding a
performance transmission, this component helps return your G50 gearbox to
factory-level performance.
What Does a Synchro Ring Do?
The synchro ring (synchroniser ring) is one of the most important wear components inside a manual gearbox.
Its primary functions include:
Synchronising
the rotational speed of the selected gear and gearbox shaft before
engagement.
- Allowing smooth gear changes without grinding.
- Reducing wear on the gear teeth, hubs and selector sleeves.
- Improving shift quality and driver confidence.
- Helping protect expensive gearbox components from premature wear.
- Delivering the precise gear engagement expected from the Porsche G50 transmission.
Without a correctly functioning synchro ring, gears cannot engage smoothly, resulting in poor shift quality and increased gearbox wear.
Why Do Synchro Rings Wear Out?
Synchroniser rings are designed as sacrificial wear components and naturally deteriorate over time.
Common causes of wear include:
- High mileage.
- Frequent gear changes during normal driving.
- Aggressive or high-performance driving.
- Poor shifting technique.
- Contaminated or degraded gearbox oil.
- Excessive transmission temperatures.
- Wear to associated synchroniser hubs and selector sleeves.
As the friction material wears, the synchroniser becomes less effective at matching gear speeds, making gear engagement progressively more difficult.
When Should the Synchro Ring Be Replaced?
Replacement is recommended when:
- Gear changes become difficult or notchy.
- Gears grind or crunch during selection.
- The gearbox is stripped for overhaul.
- The synchroniser ring shows visible wear or damage.
- Replacing selector hubs, sleeves or bearings.
- Restoring a high-mileage G50 gearbox.
- Building a performance or competition transmission.
As gearbox disassembly is required, it is considered best practice to replace all worn synchroniser components during a rebuild.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92830421105
The product you are viewing cross references to these numbers
- Porsche 911 1975-1977 3.0L Turbo (930)
2 per gearbox
Fits:
Porsche 911 Turbo 1975-77
Click 'Zoom in' to see the diagram.
Diagram ref no 45
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93030241100
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
Fits:
Porsche 911 1974-86 (915 Gearbox)
Click "Zoom in" to see the diagram.
Diagram Ref no 13.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91130241128
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
G915 up to 1975 1st gear / G915 1976>> 2nd. gear
Fits:
Porsche 911 1974-86 (915 Gearbox)
| Dog
Teeth 2nd Gear 911 1972-86 Symmetrical Tooth Point, 1 slot in hub (915 Trans. 1972-86) |
A dog-teeth gear (or synchronizer-gear hub / 1st-2nd gear dog gear) used inside the 915 gearbox. This gear section engages with corresponding hub or clutch-dog components to allow shifting between gears - in particular 1st and/or 2nd gear depending on the configuration.
Gears inside classic 915 transmissions - especially dog / synchronizer-gears - are subject to wear over time: tooth heads can round off, suffer chip-out, or distort under load; synchronizer engagement surfaces may wear and lose precision. This can cause:
• Gear-slip or missed shifts
• Grinding or clash during shifting
• Torque transmission loss or vibration under load
• Accelerated wear of other transmission internals.
Replacing worn gears with a precisely machined, correctly hardened OE-match replacement restores gear-mesh integrity, retains gearbox performance, and helps avoid costly gearbox failure.
When to Replace.
Consider fitting this gear if:
• You hear grinding, clash, or crunching during shifting - especially into 1st or 2nd gear
• Gearbox inspection reveals worn, rounded, chipped, or damaged dog-teeth or synchronizer surfaces
• You are performing a full gearbox rebuild or overhaul
• The gearbox has high mileage or signs of internal wear
• You want to restore factory-spec shifting performance and reliability
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530224200
The product you are viewing cross references to these numbers
-
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
-
gears and shafts 4-speed gear wheel sets see group 3/03/00 303-05
-
gears and shafts 5-speed gear wheel sets see group 3/03/10 303-15
-
Gear wheel sets 5-speed transmission for 911 1972 ONWARDS 303-10
-
Gears and shafts 4-speed transmission for 911 E/S UPTO 1970 and 911 T UPTO 1971 303-25
-
Gear wheel sets 4-speed transmission for 1972 ONWARDS 303-30
-
gears and shafts SPM - G 925/16 - 911 1978-83 309-05
-
gears and shafts 4-speed 911 1984-86 303-05
-
gears and shafts 5-speed 911 1984-86 303-15
-
Gear wheel sets 4-speed 911 1974-77 303-00
-
Gears and shafts 4-speed - Model 915 - 911 1974-77 303-05
-
Gear wheel sets 5-speed 911 1974-77 303-10
-
Gears and shafts 5 speed - Models: TYP 915 / TYP 923 - 911 1974-77 303-15
-
Gears and shafts 911 1974-77 SPM 309-05
-
gears and shafts 5-speed transmission for 911 UPTO 1971 303-05
-
Gears and shafts 5-speed transmission (gear wheel sets 915.300/02) for 911 1972 onwards 303-15
-
gears and shafts 4-speed transmission for 911 1972 ONWARDS 303-35
-
gears and shafts sportomatic for 911 1972 ONWARDS 308-15
-
gears and shafts 5-speed transmission 911 1965-69 303-05
-
gears and shafts 4-speed transmission 911 1965-69 303-15
-
gears and shafts sportomatic 911 1965-69 308-05
-
gear wheel sets 911 TURBO 1975-77 303-05
-
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.
