Syncro Ring Set 1st/2nd Gear. Porsche 997 C2 / C4  ❭  99730481105

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

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

Syncro ring for 3rd / 4th. Price shown is for each.



Fits:
Porsche 964 Carrera 2 RS 1992 5-Speed G50 gearbox (G50.10)
Porsche 993 Carrera RS (M003)1995 6-Speed G50 gearbox (G50.32)

Click 'Zoom in' for large parts diagram.
Diagram Ref no 7.

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Related, superseded, cross reference or alternative numbers for comparison.

92830421130

The product you are viewing cross references to these numbers