Syncro ring. Porsche 911 1987-89 G50 (5 speed gearbox)  ❭  92830421105

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.

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