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- 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 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 Ring – 3rd / 4th /
5th & Reverse Gear
Sold each - 4 required per car
Restore the smooth, precise gear changes your Porsche was
designed to deliver with this OE Match Synchro Ring for the Porsche 964 manual
gearbox. Manufactured to the original factory specification,
this helps provide accurate synchronisation
and helping restore crisp, positive gear engagement.
Fits:
- 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
Diagram Ref no 7
Each Porsche 964 manual gearbox uses four of these synchroniser rings, one for 3rd gear, 4th gear, 5th gear and reverse gear. Whether you're carrying out a complete transmission overhaul or replacing worn synchroniser components, this OE Match synchro ring offers factory-style fit, performance and durability.
What Does the Synchro Ring Do?
The synchro ring is a critical wear component within the manual transmission synchroniser assembly.
Its primary functions include:
- Synchronising the rotational speed of the selected gear and gearbox shaft before engagement.
- Allowing smooth, quiet gear changes without gear clash.
- Reducing wear on gear teeth, selector sleeves and synchroniser hubs.
- Improving shift quality and gear engagement.
- Protecting expensive internal gearbox components from premature wear.
- Maintaining the refined shifting performance expected from the Porsche 964 manual transmission.
A correctly functioning synchroniser ring is essential for smooth, accurate and reliable gear changes.
Why Do Synchro Rings Wear Out?
Synchroniser rings are designed to wear gradually during normal operation.
Common causes of wear include:
- High mileage.
- Frequent gear changes.
- Aggressive driving or rapid shifting.
- Worn or contaminated gearbox oil.
- Excessive gearbox temperatures.
- Wear to associated synchroniser hubs and selector sleeves.
- General fatigue of the friction surface over time.
As the friction material wears, the synchroniser becomes less effective at matching gear speeds, leading to more difficult gear selection and increased gearbox wear.
When Should the Synchro Ring Be Replaced?
Replacement is recommended when:
- Gear changes become stiff or notchy.
- Grinding or crunching occurs when selecting gears.
- The gearbox is stripped for overhaul.
- The synchroniser ring shows visible wear or damage.
- Replacing synchroniser hubs, selector sleeves or bearings.
- Rebuilding a high-mileage transmission.
- Preparing a gearbox for fast road or performance use.
Because gearbox disassembly is required, replacing all worn synchroniser rings during a rebuild is considered best practice.
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 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 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