Gearbox Gears / Crown Wheel and Pinion

Fits:
Porsche 986 Boxster S - 1999 to 2005
Porsche 996 Carrera 2 - 1997 to 2005

Available with different gear ratios - example - 11:32 (number of teeth on each gear) - 2.91:1 (gear ratio)

11:32 - 2.91:1
10:30 - 3.00:1
9:34 - 3.77:1
8:33 - 4.125:1

Diagram ref no 1

Fits:
Porsche 996 GT3 - 2003 to 2005
Porsche 997 GT3 - 2007 to 2012

Gear ratio 10:31 - 3.10:1
10:31 (number of teeth on each gear) - 3.10:1 (gear ratio)

Diagram ref no 8

Fits:
Porsche 996 Turbo 2001-05 G96.50

Porsche guide sleeve assembly, comprising a synchronising hub and operating sleeve, for the specified 993, 996 and 997 manual transmissions. Gear-pair allocation depends on the gearbox: the diagrams identify both 3rd/4th-gear and 5th/6th-gear positions.

Fits

• Porsche 993 Carrera G50.20/21, 1995 onwards
  Supplied variants: 993 (911) C2 1994–97; 993 (911) C2S 1994–97.
• Porsche 993 Carrera 4 G64.20/21, 1995 onwards
  Supplied variants: 993 (911) C4 1994–97; 993 (911) C4S 1994–97.
• Porsche 993 Carrera RS G50.31/32/33, 1994–98
  Supplied variant: 993 (911) RS 1994–97.
• Porsche 993 Turbo G64.51, 1994–98
  Supplied variants: 993 (911) TURBO 1994–96; 993 (911) TURBO S 1994–97.
• 993 (911) GT2 1994–97.
• Porsche 996 Turbo and Turbo X50 G96.50, 2001–05 — 5th/6th gear
  Supplied model coverage: 996 TURBO 2000–05.
• Porsche 996 GT2 G96.88, 2001–05 — 5th/6th gear
• Porsche 996 GT3-1 G96.90, 2000–01; G96.93, 2001; G96.96, 2004–05 — 5th/6th gear
  Supplied variants: 996 GT3 MKI 1999–02; 996 GT3 MKII 2003>>; 996 GT3 RS 2003–04.
• Porsche 997.1 Turbo GT2 G97.88, 2008–09, and 997.1 GT2 RS G97.88, 2011 — 5th/6th gear
  Supplied variants: 997 MK1 TURBO 2007–09; 997 MK1 GT2 2007–09.
• Porsche 997 GT3 G97.90, up to 2009 — 5th/6th gear
  Supplied variants: 997 MK1 GT3 / GT3 RS 2007–09.
• Porsche 997 GT3 / GT3 RS G97.90/92, 2010 onwards — 5th/6th gear
  Supplied variants: 997 MKII GT3 / GT3 RS 2010–11.
• Porsche 997.2 GT2 RS G97.88, 2011 — 5th/6th gear
  Supplied model coverage: 997 MKII GT2 RS 2011–13; the corresponding diagram also uses G9788.

Confirm the vehicle's model, production year, engine, gearbox designation and transmission serial number before ordering. The model-year listings do not replace the gearbox-specific restrictions.

What This Product Does

Within the manual transmission, this assembly connects gear selection with the synchronising mechanism. Movement of the sleeve allows the selected gear to couple to its shaft; matching the sleeve to the correct transmission and gear position is essential.

Functions

• Provides the hub and sliding sleeve used for gear engagement.
• Works with the associated synchroniser components during selection.
• Serves the gear pair identified for each applicable gearbox.

Technical Details

• Porsche identification number: 95030402123.
• Diagram terminology: guide sleeve; synchronising hub and operating sleeve assembly.
• Specified 993 3rd/4th-gear version: internal dimension 33.66 mm.
• 993 transmission serial-number restrictions: G50.20 1 002694 >>; G50.20 2 002174 >>; G50.21 1 005073 >>; G50.21 2 003095 >>. Associated production remark: 95-95-95-95-.
• The 993 diagram also identifies a 5th/6th-gear position. Later listed 996 and 997 diagrams identify this component for 5th/6th gear.
• Recorded diagram quantity: 1 for each applicable position; this is not a statement of package contents.

Symptoms of Fault

Possible indications include resistance when selecting the relevant gears, a crunch during shifts, unreliable engagement or jumping out of gear. Inspection may reveal scoring, looseness or damaged engagement surfaces. Metallic particles in gearbox oil suggest internal deterioration but do not identify this sleeve alone as the cause.

Why Replacement Matters

Renewal is appropriate when inspection confirms damage or wear affecting engagement. During dismantling, assess adjacent gear teeth, synchroniser rings, springs, engagement pieces and bearings. Check the clutch, selector linkage and lubricant specification as well, since faults elsewhere can resemble a sleeve problem.

FAQs

Which gear pair uses this assembly?
The relevant 993 entry specifies 3rd/4th gear, while another 993 position and the listed later transmissions specify 5th/6th gear. Match the diagram position and transmission serial restrictions.

Does a difficult shift prove sleeve failure?
No. Diagnosis should distinguish internal wear from clutch, linkage and lubrication problems before parts are selected.

What should be checked during installation?
A gearbox specialist should examine the neighbouring synchroniser hardware, bearings and gears, then follow the applicable assembly procedures.