Gearbox Syncro Ring / Brake Band / Dog Teeth

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

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

Genuine Porsche synchroniser ring for first and second gears in the Porsche 911 Turbo (930) four-speed gearbox, covering the supplied 1975–1988 application.

Fits:
Porsche 911 Turbo 1975 - 1988 (4 speed gearbox)

Diagram ref no: 41

What This Product Does

The synchro ring works within the gearbox synchroniser assembly to bring rotating components towards matching speeds before the selected gear engages. This product is the ring for first or second gear, not a brake band or dog-tooth component.

Functions

• Provides friction for synchronising gear speeds during selection.
• Supports engagement of first or second gear within the specified transmission.

Technical Details

• Brand: Genuine Porsche.
• Gear application: 1st/2nd gear.
• Transmission application: four-speed manual gearbox.
• Existing product reference: 93030230100.

Symptoms of Fault

• Crunching or grinding while selecting first or second gear.
• Resistance to engagement or a need to pause before completing a shift.
• Gear clash during downshifts.

These symptoms do not confirm ring wear on their own. Clutch operation, linkage condition and gearbox oil can also affect selection.

Why Replacement Matters

A worn friction surface can prevent the synchroniser assembly from matching speeds effectively. Renewing a ring after confirmed wear addresses that component during gearbox repair. Inspect the associated engagement teeth, brake bands and selector components rather than assuming the ring is the only worn part.

FAQs

Will fresh gearbox oil repair a worn ring?
No. Correctly specified oil may influence shift feel, but it cannot restore a worn friction surface.

Does double-declutching fix the problem?
It may ease the symptoms, but it does not renew damaged synchroniser components.

Which reference should I check?
Confirm the recorded part number and the relevant gearbox illustration before ordering, as the supplied product and internal diagram references differ.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93030230110

The product you are viewing cross references to these numbers

Synchro ring 3rd/4th gear, for 4 speed gearbox.



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

Synchro ring, 1st / 2nd gear
OE Match synchroniser ring for first and second gear in the Porsche 911 Turbo (930), covering 1975–1988 vehicles with a four-speed gearbox. It is a replacement component for worn synchroniser assemblies during transmission repair or rebuilding.

Fits:
Porsche 911 Turbo 1975 - 1988 (4 speed gearbox)

Diagram ref no 41

What This Product Does

The synchroniser ring provides friction within the synchronising mechanism to help bring rotating components to matching speeds before a gear engages. Its role concerns gear synchronisation rather than replacing the separate brake bands, engagement teeth or shifting sleeve.

Functions

• Helps synchronise rotational speeds during first- or second-gear selection.
• Forms part of the gearbox synchroniser assembly.

Technical Details

• Gear application: 1st / 2nd gear.
• Transmission application: four-speed gearbox.
• Supplied product reference: 93030230100.

Symptoms of Fault

• Crunching or grinding during first- or second-gear selection.
• Resistance to engagement or a need to pause between shifts.
• Gear clash when changing down.

These symptoms are not conclusive evidence of ring wear. Clutch operation, linkage condition and gearbox oil can also affect selection.

Why Replacement Matters

A worn friction surface can compromise synchronisation. Renewing the affected ring addresses this wear during a diagnosed gearbox repair. Inspect the associated engagement teeth, brake bands and shifting components at the same time, rather than assuming the ring alone accounts for every shifting problem.

FAQs

Can different gearbox oil repair a worn ring?
Correctly specified oil may influence shift feel, but it cannot renew worn synchroniser surfaces.

Does double-declutching resolve the fault?
It may make engagement easier, but it does not repair the underlying wear.

What should be checked before replacement?
Confirm the gearbox specification and assess the clutch, linkage and related synchroniser components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93030230110

The product you are viewing cross references to these numbers

Syncro ring 3rd/4th gear, for 4 speed gearbox

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

Syncro shifting sleeve 1st / 2nd gear.
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