synchronizing hub with operating sleeve Genuine Porsche part 95030402181

Guide sleeve 3rd/4th gear

Fits:
Porsche 911 87-89 950 Gearbox 5-speed
Porsche 964 C2 / C4 / TURBO

Click 'Zoom in' for large parts diagram
Diagram ref no 8

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95030402181

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Synchro Hub With Locking Collar, Manual Transmission 5-Speed, Gears 1/2.
5-Speed Manual Transmission ONLY! 
Pressure Springs, Balls And Thrust Piece Included.

Fits:
Porsche 911 1987>>1989
Porsche 959 1987>>1988
Porsche 964 Carrera 2/4 1989>>1994

Diagram Ref No 33 (Diagram Ref No 11, 34 And 35 Included)

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95030403131

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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.

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95030402123

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Synchronizing Hub With Locking Collar, 5th / Reverse Gear
Genuine Porsche synchronising hub / guide sleeve with locking collar for 5th and reverse gear, designed for Porsche 911 and 964 models fitted with the applicable G50 5-speed manual transmission.

Fits:
Porsche 911 Carrera 3.2L 1978 - 1989   with G50/00, /01, /02  gearbox
Porsche 911 Turbo 3.3L (930) 1989 with G50/50  gearbox
 
Porsche 964 Carrera 2 3.6L 1990 - 1994 with G50/03, /04, /05  gearbox
Porsche 964 Carrera RS 3.6L / RS 3.8L  1992–1993    with G50/10 gearbox
Porsche 964 Turbo 3.3L / 3.6L  1991 - 1994 with G50/52 gearbox

 * Check fitment for your specific vehicle (model, year, engine) before ordering. Confirm the gearbox type as well: the supplied application notes specify a five-speed transmission and reverse gear, rather than every transmission fitted to these models.

Diagram ref no  41

This original Porsche gearbox component forms part of the transmission's 5th and reverse gear engagement mechanism. It works with the synchroniser and selector assembly to allow the appropriate gear to be selected and engaged.

Manufactured to the original Porsche specification, it is an essential replacement component when repairing worn gear engagement parts, rebuilding a G50 transmission or restoring the correct operation of the manual gearbox.

This component forms part of the internal gearbox gear-selection assembly.

What This Part Does / Functions

• Supports engagement of 5th and reverse gears
• Works with the gearbox synchroniser and selector mechanism
• Slides into the required position during gear selection
• Helps transmit the selector movement to the relevant gear engagement components
• Supports correct mechanical engagement of the selected gear
• Replaces a worn or damaged original operating sleeve
• Helps restore normal 5th and reverse gear selection when sleeve wear is the confirmed cause
• Maintains the factory Porsche G50 gearbox configuration.

Why Replace This Part?
The synchroniser guide sleeve is subjected to repeated mechanical loading whenever the corresponding gears are selected. Over time, the sleeve's engagement teeth and contact surfaces can become worn, chipped or damaged. Excessive wear may cause difficult gear engagement, resistance during shifting or problems maintaining proper engagement.

Replacing the damaged sleeve with a Genuine Porsche gearbox component helps restore the correct mechanical arrangement of the transmission.

Common Symptoms of a Worn Synchronising Hub / Guide Sleeve

• Difficulty selecting 5th gear
• Difficulty engaging reverse gear
• Gear selection feels rough or notchy
• Excessive resistance when selecting the affected gears
• Gear engagement becomes inconsistent
• Damaged or rounded engagement teeth
• Unusual mechanical noise during gear selection
• Worn sleeve discovered during gearbox disassembly
• Gear jumping out of engagement where internal wear is present

These symptoms may also result from worn synchroniser rings, selector forks, gear engagement teeth or gearbox adjustment faults.

A complete transmission inspection is recommended before replacing internal components.

When to Replace This Part

• During G50 gearbox rebuilding
• When 5th or reverse gear engagement components are worn
• If the locking collar or guide sleeve is chipped or damaged
• When repairing difficult gear selection
• During replacement of associated synchroniser components
• If excessive wear is discovered during gearbox disassembly.

Where It Fits on the Car
The guide sleeve is fitted inside the G50 manual gearbox, within the 5th and reverse gear selector and engagement assembly. It works alongside the relevant synchroniser components, selector fork and gear engagement mechanism. The gearbox must be dismantled to access and replace the sleeve.

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95030402105

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