Operating Sleeve / Slider and Parts

Gearshift sleeve, 1st - 2nd Gear.



Fits:
Porsche 911 1972-77 915 Manual Transmission
not for 915/60/61 gearboxes

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Diagram ref no 42

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91530241100

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Gearshift sleeve, 3rd - 4th Gear
This OE Match gearshift sleeve is a replacement transmission synchroniser sleeve for 3rd and 4th gear on Porsche 911 models from 1966 to 1977. It is designed to match the original-style fit and function, helping restore smooth and accurate gear engagement.
Sold individually

Fits:
Porsche 911 1966-71 901 gearbox
Porsche 911 1972-77 915 gearbox
for Narrow Guide Sleeve

Diagram ref no 13

The gearshift sleeve forms part of the gearbox synchroniser assembly. During gear changes, it moves to engage the selected gear, working with the synchro hub, synchro rings, and dog teeth to help the gearbox shift cleanly between 3rd and 4th gear.

Functions
•  Replaces the 3rd–4th gear synchroniser / gearshift sleeve
•  Helps engage 3rd and 4th gears correctly
•  Supports smooth and accurate gear changes
•  Works with the synchro hub, synchro rings, and dog teeth
•  Helps reduce gear selection issues when replacing worn components
•  Suitable for gearbox rebuilds and transmission repair
•  OE Match replacement for classic Porsche gearbox service.

Why Replace This Part?
Gearshift sleeves can wear due to repeated gear changes, high mileage, poor lubrication, worn synchro components, or gearbox abuse. A worn or damaged sleeve may cause difficult gear selection, crunching, baulking, jumping out of gear, or poor shift feel. Replacing the sleeve during gearbox overhaul helps restore correct synchroniser operation and reliable gear engagement.

When to Replace
•   This Part 3rd or 4th gear is difficult to select
•   Gear changes feel notchy, rough, or inconsistent
•   Crunching or baulking occurs during 3rd–4th gear shifts
•   The gearbox jumps out of gear
•   The sleeve teeth are worn, chipped, rounded, or damaged
•   The synchro rings, hubs, or dog teeth are being replaced
•   The gearbox is being rebuilt or inspected.

Where it fits on the car
This gearshift sleeve fits inside the gearbox synchroniser assembly for 3rd and 4th gear. It is part of the internal transmission gear selection system and should be installed according to the factory gearbox layout.

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91130241110

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Guide sleeve 3rd/4th gear



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

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Diagram ref no 8

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95030402181

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Shifting gear for 1st and reverse (outer hub).



Fits:
Porsche 911 65-71 (901 Gearbox)
Porsche 914 / 914-6 1970-76

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Diagram ref no 42

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91130222602

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Shifting gear for 1st and reverse (outer hub).



Fits:
Porsche 911 65-71 (901 Gearbox)
Porsche 914 / 914-6 1970-76

Click 'Zoom in' for large parts diagram.
Diagram ref no 42

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91130222602

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The Porsche replacement product code 91530222709 is a precision-engineered component integral to the 915 manual transmission system found in Porsche 911 models from 1972 to 1986

This part is a shift sleeve, also known as a synchromesh sleeve or slider, specifically designed for the 5th gear and reverse gear operations in the 915 gearboxes. The shift sleeve facilitates the engagement and disengagement of gears by sliding along the main shaft to align with the corresponding gear teeth. It plays a crucial role in ensuring smooth and precise gear shifts, particularly when selecting 5th gear or reversing.

Typically crafted from high-strength steel alloys, the shift sleeve is designed to withstand the stresses and forces encountered during gear changes.

Fits:
Porsche 911 72-86 915 Gearbox
Manual transmission

Over time and with extensive use, the shift sleeve can experience wear and degradation, leading to various transmission-related issues:

• Difficulty Engaging 5th Gear or Reverse: Excessive wear on the shift sleeve's teeth or detents can result in challenges when attempting to engage 5th gear or reverse, often requiring additional effort or multiple attempts.
• Grinding Noises: Worn or damaged shift sleeves may fail to fully engage the gear, causing grinding noises during gear selection.
• Slipping Gears: Improper engagement due to a faulty shift sleeve can lead to gears slipping out of engagement, posing safety risks and potential damage to the transmission.
• Inconsistent Shifting Feel: A degraded shift sleeve can result in an inconsistent or "notchy" shifting experience, detracting from the smooth operation expected in Porsche vehicles.

OE Match produces products to the Original Equipment Manufacturer (OEM) standard parts, ensures the replacement component meets a stringent quality standard and guarantees proper fitment.

Professional Installation: Given the complexity of transmission systems, it's advisable to have the shift sleeve replaced by a qualified technician to ensure correct installation and to avoid potential damage to the transmission.

Inspection of Related Components: During replacement, it's prudent to inspect related components, such as the synchro rings and gear teeth, for wear or damage to prevent recurring issues.

Diagram ref no 57

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91530222709

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Shifting gear



Fits:
Porsche 911 72-89 915 Gearbox
Manual transmission

Click 'Zoom in' for large parts diagram.
Diagram ref no 57

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91530222709

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Synchro body for shift wheel.



Fits:
only for type 915 transmission
Porsche 911 1972-73
Porsche 911 1974-86

Click 'Zoom in' for large parts diagram.
Diagram ref no 56

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91530240511

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Synchro Guide Hub 91530240102 1st/2nd Gear – 915 Gearbox

Restore the crisp shifting performance of your classic Porsche 911 with this OE Match Synchro Guide Hub. Designed specifically for Porsche 911 models fitted with the legendary 915 gearbox between 1974 and 1986, this precision-engineered component forms a critical part of the 1st and 2nd gear synchroniser assembly, helping to ensure smooth gear engagement and reliable transmission operation.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L

Diagram Ref no 41

Manufactured to OE specifications, this replacement synchro guide hub delivers the correct fit, strength and dimensional accuracy required for professional gearbox rebuilds and classic Porsche restorations. Whether you're addressing worn synchroniser components, improving shift quality or carrying out a complete transmission overhaul, replacing worn guide hubs helps restore factory gear change performance.

What Does the 1st/2nd Gear Synchro Guide Hub Do?

The synchro guide hub is a central component within the Porsche 915 gearbox synchroniser assembly. Located between 1st and 2nd gears, it provides the mounting and guidance structure for the synchroniser mechanism and works in conjunction with the operating sleeve, synchro rings, brake bands and anchor blocks.

Its primary function is to facilitate smooth gear engagement by helping synchronise the rotational speeds of the gears before they lock together.

The guide hub helps:

• Support the synchroniser assembly.
• Control movement of the operating sleeve.
• Facilitate smooth 1st and 2nd gear engagement.
• Reduce gear clash during shifting.
• Maintain accurate gear selection.
• Improve overall gearbox operation and shift quality.

A properly functioning guide hub is essential for preserving the characteristic feel and reliability of the Porsche 915 transmission.

Why Do Synchro Guide Hubs Fail?

Over decades of service, synchroniser components are subjected to constant mechanical stress and repeated gear changes. Wear and fatigue can gradually affect the guide hub and surrounding synchroniser parts.

Common causes of failure include:

• High mileage wear.
• Aggressive shifting habits.
• Repeated gear engagement stress.
• Excessive synchroniser wear.
• Poor gearbox lubrication.
• Contaminated transmission oil.
• Metal fatigue over time.
• Damage during previous gearbox repairs.

Because 1st and 2nd gears are often the most frequently used ratios, the synchroniser assembly in this area of the gearbox is commonly one of the first sections to show wear.

When Should a Synchro Guide Hub Be Replaced?

The synchro guide hub should be inspected whenever the gearbox is dismantled or rebuilt. Replacement is recommended if you experience:
Difficulty engaging 1st or 2nd gear.

• Gear crunching during shifts.
• Notchy gear changes.
• Excessive transmission wear.
• Visible scoring, cracking or damage.
• Worn synchroniser assemblies.
• Poor shift quality despite replacing synchro rings.

Most Porsche transmission specialists recommend replacing worn synchroniser components during a gearbox overhaul to ensure consistent performance and maximise gearbox longevity.

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91530240102

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Synchro Guide Sleeve 3rd/4th Gear – 915 Gearbox

Restore the precise shifting performance of your classic Porsche 911 with this OE Match 3rd/4th Gear Synchro Guide Sleeve, designed specifically for Porsche 911 models equipped with the renowned 915 gearbox between 1974 and 1986. As a critical component within the synchroniser assembly, the guide sleeve helps ensure smooth gear engagement and accurate gear selection between third and fourth gears.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L

Diagram Ref no 12

Manufactured to OE specifications, this replacement synchro guide sleeve provides the correct fit, machining accuracy and durability required for Porsche transmission rebuilds and restorations. Whether you are addressing gear selection issues, carrying out a gearbox overhaul or restoring a classic air-cooled 911, replacing worn synchroniser components is essential for maintaining smooth and reliable gear changes.

What Does the 3rd/4th Gear Synchro Guide Sleeve Do?

The synchro guide sleeve is a vital component within the Porsche 915 gearbox synchroniser assembly. It works alongside the synchroniser rings, brake bands, anchor blocks and operating sleeves to allow gears to engage smoothly and without excessive wear.

When a gear change is made, the guide sleeve helps control the movement of the synchroniser mechanism, ensuring rotational speeds between gears are matched before engagement occurs.

The guide sleeve performs several important functions:

• Guides synchroniser operation during gear changes.
• Supports smooth engagement of 3rd and 4th gears.
• Helps synchronise gear speeds before engagement.
• Reduces gear clash and transmission wear.
• Maintains precise gear selection.
• Contributes to the distinctive shifting feel of the Porsche 915 gearbox.

Without a properly functioning guide sleeve, gear engagement quality can deteriorate significantly.

Why Do Synchro Guide Sleeves Fail?

The synchroniser system experiences constant mechanical loading during every gear change. Over time, wear and fatigue can affect the guide sleeve and associated synchroniser components.

Common causes of failure include:

• Wear from repeated shifting cycles.
• Metal fatigue over high mileage.
• Poor lubrication caused by contaminated gearbox oil.
• Aggressive or incorrect shifting techniques.
• Excessive wear in synchroniser assemblies.
• Gearbox overheating.
• General age-related component deterioration.

As many Porsche 911 models equipped with the 915 transmission are now several decades old, wear within the synchroniser system is extremely common and often contributes to poor shift quality.

When Should a Synchro Guide Sleeve Be Replaced?

The synchro guide sleeve should be carefully inspected whenever the gearbox is dismantled. Replacement is recommended if you experience:
Difficulty selecting 3rd or 4th gear.

• Gear crunching during shifts.
• Notchy or inconsistent gear engagement.
• Gearbox rebuild requirements.
• Excessive wear on synchroniser components.
• Visible scoring, damage or distortion.
• Transmission noise associated with worn synchroniser assemblies.

Most transmission specialists recommend replacing worn synchroniser components during a gearbox overhaul to restore optimal shift quality and prevent premature future wear.

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91130240222

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Synchro Shifting Sleeve 1st/2nd Gear. 
The OE Match Synchro Shifting Sleeve, 1st/2nd Gear is a high-quality replacement transmission component designed to facilitate the engagement of first and second gears within Porsche manual gearboxes. Manufactured to OE specifications for fit, precision and durability, this shifting sleeve forms a critical part of the synchroniser assembly, ensuring smooth, accurate and reliable gear selection.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L  

Diagram Ref No 42

Working in conjunction with the synchroniser hub, synchro rings and dog teeth, the shifting sleeve slides across the synchroniser assembly to engage the selected gear once rotational speeds have been synchronised. Precision machining and correct fitment are essential for maintaining shift quality, reducing gearbox wear and ensuring dependable transmission performance.  

What This Product Does:

• Engages first and second gears within the gearbox.
• Works with the synchroniser assembly to enable smooth gear changes
• Transfers movement from the gear selector mechanism to the selected gear.
• Helps ensure accurate and positive gear engagement.
• Supports proper synchronisation before gear selection.
• Reduces gear clash and transmission wear.
• Contributes to smooth manual gearbox operation and drivability.

Symptoms Of Wear Or Failure:

• Difficulty engaging first or second gear.
• Gear grinding or crunching during shifts.
• Notchy or inconsistent gear changes.
• Excessive resistance when moving the gear lever.
• Gear disengagement or jumping out of gear under load.
• Poor shift quality and reduced transmission precision.
• Increased gearbox noise during gear changes.
• Visible wear, chipping or rounding of engagement surfaces during inspection.

Why Replacement Matters:

• The synchro shifting sleeve experiences repeated mechanical loading every time first or second gear is selected. Over time, the engagement surfaces can wear, become rounded or suffer damage, reducing the sleeve's ability to engage gears cleanly and securely.
• A worn shifting sleeve can compromise gear engagement, place additional strain on synchroniser rings and dog teeth, and accelerate wear throughout the gearbox. If left unresolved, continued operation may lead to increasingly poor shift quality and more extensive transmission repairs.
• Replacing a worn synchro shifting sleeve restores accurate gear engagement, improves transmission performance and helps protect other synchroniser components from premature wear. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring smooth and reliable shifting performance for your Porsche manual transmission.

Related reference numbers
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93030241103

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Synchro shifting sleeve 3rd/4th gear.



Fits:
Porsche 911 1974-86 (915 Gearbox)

Click "Zoom in" to see the diagram.
Diagram Ref no 13.

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91130241128

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