Dog teeth 3rd / 4th gear. Porsche 911 Turbo 1975-88 (4 speed gearbox)  ❭  93030224300

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.

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93030224300

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