Synchro ring 3rd / 4th / 5th Gear. Porsche 911 1969-86 (915 Gearbox)  ❭  91130230113

Synchro Ring 3rd / 4th / 5th Gear. (3 Per Gearbox)
The OE Match Synchro Ring is a high-quality replacement transmission component designed for use in 3rd, 4th and 5th gear positions within Porsche manual gearboxes. Manufactured to OE specifications for fit, precision and durability, this synchroniser ring plays a critical role in ensuring smooth and accurate gear changes by matching gear and shaft speeds before engagement.  

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 914 (1970-1976)  

Diagram Ref No 10

Working in conjunction with the synchroniser hub, selector sleeve and dog teeth, the synchro ring uses friction to equalise rotational speeds between transmission components, allowing gears to engage smoothly and reducing wear on the gearbox. Three synchro rings are typically required per gearbox, one for each applicable gear position.  

What This Product Does:

• Synchronises gear and shaft speeds before engagement.
• Enables smooth selection of 3rd, 4th and 5th gears.
• Reduces gear clash and grinding during shifting.
• Works with the synchroniser assembly and dog teeth.
• Improves gearbox shift quality and drivability.
• Minimises wear on transmission engagement components.
• Supports reliable and efficient manual gearbox operation.

Symptoms Of Wear Or Failure:

• Difficulty engaging 3rd, 4th or 5th gear.
• Gear grinding or crunching during gear changes.
• Increased resistance when shifting.
• Notchy, inconsistent or rough gear engagement.
• Requirement to force the gear lever into gear.
• Excessive transmission noise during shifting.
• Poor shift quality, especially at higher engine speeds.
• Accelerated wear of dog teeth, selector sleeves and related components.

Why Replacement Matters:

• Synchroniser rings are wear items that experience friction every time a gear is selected. Over time, the friction surfaces wear down, reducing their ability to equalise gear speeds before engagement. This can result in difficult gear selection, noisy shifts and increased wear throughout the transmission.
• A worn synchro ring places additional stress on dog teeth, selector sleeves and synchroniser hubs, potentially leading to more extensive gearbox damage and expensive repairs if left unattended. Reduced synchronisation can also detract from driving enjoyment and compromise the smooth operation expected from a Porsche manual transmission.
• Replacing worn synchro rings restores proper synchronisation, improves gear change quality and helps protect other internal gearbox components from premature wear. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring dependable transmission performance and smooth gear engagement.

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

91130230113

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