Original Porsche Part Genuine Porsche part 99630465100

The OE Match Synchro Cone Ring is a replacement manual-transmission synchroniser component for the 1st and 2nd gear synchromesh assembly on selected Porsche 986 Boxster S and 996 Carrera models.

• Porsche Boxster S 986 3.2L 2000-02 (6-Speed Manual)
• Porsche Boxster S 986 3.2L 2003-04 (6-Speed Manual)
• Porsche 996 C2 3.4L 1997-08/01 (6-Speed Manual)
• Porsche 996 C4 3.4L 1997-08/01 (6-Speed Manual)    

Located inside the gearbox, the cone ring uses friction to help equalise the rotational speed of the selected gear and transmission shaft before the engagement components lock together.

This process is essential for smooth gear selection and helps prevent grinding, crunching and excessive shock loading during shifts.

The OE Match replacement is suitable for gearbox rebuilding or repair where the original cone ring has become worn, glazed, scored or otherwise unable to provide effective synchronisation.

What This Product Does:
When the driver changes gear, the selected gear and transmission shaft may be rotating at different speeds.

Before the gear can engage cleanly, the synchroniser assembly must bring those speeds together.

The synchro cone ring helps:

• Synchronise rotational speeds before gear engagement
• Support smooth selection of 1st and 2nd gear
• Reduce crunching and gear clash
• Reduce shock loading during gear changes
• Protect the operating sleeve and engagement teeth
• Improve gear-change precision
• Reduce the effort required to select a gear
• Maintain reliable manual transmission operation

The cone ring works as part of a complete synchroniser assembly rather than operating independently. Correct operation also depends on the condition of the synchroniser rings, guide sleeve, dog teeth, gears and selector components.

Symptoms Of Wear Or Failure:
Common symptoms of a worn 1st/2nd gear synchro cone ring can include:

• Grinding or crunching when selecting 1st gear
• Grinding or crunching when selecting 2nd gear
• Difficulty engaging 2nd gear
• Reluctance to select 1st gear while moving
• Notchy gear changes
• Increased gear-lever effort
• Gear engaging more easily when shifted slowly
• Difficulty downshifting from 3rd into 2nd
• Improved shifting when double-declutching
• Gear clash during fast shifts
• Poorer shift quality when the gearbox is cold
• Metallic noise during gear engagement
• Visible scoring on the cone surface
• Glazed or polished friction surfaces
• Excessive synchroniser clearance discovered during gearbox inspection

A worn synchroniser system may also be associated with 2nd gear pop-out, but this symptom should not automatically be attributed to the cone ring alone. The guide sleeve, gear engagement teeth, synchroniser rings, selector mechanism and other gearbox components may also contribute.

Why Replacement Matters:
A worn cone ring cannot synchronise the selected gear quickly enough before engagement.

If the gearbox continues to be used with poor synchronisation, repeated gear clash can accelerate wear to other transmission components.

Potential secondary damage can affect:

• Gear engagement teeth
• Dog teeth
• Guide / operating sleeve
• Synchroniser rings
• Selector components
• Gear wheels
• Associated transmission parts

Replacing a worn cone ring as part of a correctly diagnosed gearbox repair helps restore smooth synchronisation and can prevent further deterioration of more expensive components.