Syncro ring. Porsche 928 1985-95  ❭  92830421105

Synchro Ring – 3rd / 4th / 5th & Reverse Gear 

Restore the smooth, precise gear changes your Porsche was engineered to deliver with this OE Match Synchro Ring for the Porsche 928 5-speed manual gearbox. Manufactured to the original factory specification, this helps to restore crisp gear engagement while reducing wear on the transmission's synchronising components.

Fits:

• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92
• Porsche 928GT 5.0L 1989-91
• Porsche 928GTS 5.4L 1992-95

Diagram Ref no 7

Precision manufactured from high-quality materials, this synchroniser ring delivers consistent friction characteristics for reliable synchronisation between the selected gear and gearbox shaft. Whether you're carrying out a complete gearbox rebuild or replacing worn synchroniser components, this OE Match synchro ring provides factory-style fit, performance and durability.

What Does the Synchro Ring Do?

The synchro ring is a vital component within the manual gearbox synchroniser assembly.

Its primary functions include:

• Synchronising the speed of the selected gear and gearbox shaft before engagement.
• Allowing smooth gear changes without grinding or gear clash.
• Reducing wear on gears, selector sleeves and synchroniser hubs.
• Providing smooth, positive gear engagement.
• Protecting expensive internal gearbox components.
• Maintaining the refined shifting characteristics of the Porsche 928 transmission.

A correctly functioning synchro ring ensures each gear engages smoothly with minimal effort.

Why Do Synchro Rings Wear Out?

Synchroniser rings are designed as service wear components and naturally deteriorate through use.

Common causes of wear include:

• High mileage.
• Repeated gear changes during everyday driving.
• Aggressive shifting or performance driving.
• Worn or contaminated gearbox oil.
• Excessive gearbox temperatures.
• General fatigue of the synchroniser friction surfaces.
• Wear to associated hubs and selector sleeves.

As the friction surface wears, the synchroniser becomes less effective at matching gear speeds, resulting in increasingly difficult or noisy gear changes.

When Should the Synchro Ring Be Replaced?

Replacement is recommended when:

• Gear selection becomes difficult.
• Grinding or crunching occurs during gear changes.
• The gearbox is being rebuilt.
• Inspection reveals worn or damaged synchroniser rings.
• Replacing synchroniser hubs, selector sleeves or bearings.
• Restoring a high-mileage transmission.
• Building a performance or competition gearbox.

Because gearbox disassembly is required, replacing all worn synchroniser components during a rebuild is considered best practice.

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