Syncroniser ring, manual transmission. Porsche 356 A/B/C  ❭  71630230107

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

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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.

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

G50 Transmission synchroniser ring for 1st – 2nd gear.
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