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thrust piece Genuine Porsche part 91530231502

Code: 91530231502

Genuine Porsche part

thrust piece

The product code 91530231502 was also found on these diagrams

303-005 - stone

Gears and shafts / 5-speed Transmission / Gear wheel sets (Model: ' J.. ', VA) 924 1976-79

303-005 - stone

Gears and shafts / Manual transmission - G31.01/02/03 - 924 TURBO / GT 1980 - 1985

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

Synchro ring 1st gear. Porsche 911 1974-86 (915 Gearbox)

91530230113/1

Product Information

Synchro Ring 1st Gear.
The OE Match 1st Gear Synchro Ring is a high-quality replacement transmission component designed to facilitate smooth and precise engagement of first gear in Porsche manual gearboxes. Manufactured to OE specifications for fit, accuracy and durability, this synchroniser ring forms a critical part of the gearbox synchronisation system, helping to match gear and shaft speeds before engagement occurs.

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 39

Working alongside the synchroniser hub, dog teeth and selector sleeve, the synchro ring reduces speed differences between rotating gearbox components, allowing gears to engage smoothly without excessive noise, grinding or wear. Precision engineering ensures reliable operation and helps maintain the shift quality expected from a Porsche transmission.

What This Product Does:

Synchronises rotational speeds before first gear engagement.
Helps ensure smooth and precise gear changes.
Reduces gear clash and grinding during shifting.
Works with the synchroniser assembly and dog teeth.
Improves transmission shift quality and drivability.
Minimises wear on gearbox engagement components.
Supports reliable operation of the manual transmission.

Symptoms Of Wear Or Failure:

Difficulty selecting first gear.
Gear grinding or crunching during engagement.
Increased resistance when shifting into first gear.
Notchy or inconsistent gear changes.
Requirement to force the gear lever into position.
Excessive gearbox noise during shifting.
Premature wear of dog teeth and related synchroniser components.
Poor shift quality, particularly when the gearbox is cold.

Why Replacement Matters:

Synchroniser rings are subjected to constant friction and wear every time a gear is selected. Over time, the friction surfaces can wear down, reducing their ability to equalise rotational speeds effectively before gear engagement. This can lead to difficult gear selection, increased transmission noise and accelerated wear of surrounding gearbox components.
A worn synchro ring can place additional strain on dog teeth, selector sleeves and synchroniser hubs, potentially leading to more extensive and expensive gearbox repairs if left unresolved. Poor synchronisation can also diminish driving enjoyment and compromise the smooth operation of the transmission.
Replacing a worn first gear synchro ring restores proper synchronisation, improves shift quality and helps protect the transmission from further internal wear. An OE Match replacement provides factory-style fitment, precision manufacturing and long-term durability, ensuring smooth and reliable gearbox performance for your Porsche.

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

91530230113

15455

91530230106

91530230113

The product you are viewing cross references to these numbers

Synchro ring 2nd gear. Porsche 911 1974-86 (915 Gearbox)

91530230114/1

Product Information

Synchro ring 2nd gear, for 915 Gearbox.
This synchroniser ring that fits into the 915 gearbox of a Porsche 911. Its role is to match the rotational speed of a gear to the shaft before the dog teeth engage, enabling grind-free shifting, especially into 2nd gear.

Fits:
Porsche 911 2nd Gear Only 1974 - 1986 (915 Trans.)
Porsche 912E 1st-2nd Gears 1972 - 1976

Diagram Ref no 39.

•  Function: The synchroniser ring helps match the speed of the transmission shaft and gear before engagement, enabling smooth shifting without gear clash.

•  Position: Located inside the 915 manual gearbox, specifically associated with 1st/2nd gear synchronising assembly (diagram ref no 39)

•  Benefit: Restores precise gear changes, reduces shifting effort, prevents gearbox noise or damage

Over time, the synchroniser ring’s friction surfaces wear, reducing its ability to align gear speeds. This can lead to gear grinding, difficulty selecting 2nd gear, or “pop-out” under load.

When to replaces:
• During a gearbox overhaul or rebuild of a 915 transmission.
• If you experience gear grinding, hard 2nd gear shifts, or gear pop-out.
• When you’re replacing other major gearbox components - installing a new synchro ring ensures correct engagement and long transmission life.

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

91530230114

91530230104

The product you are viewing cross references to these numbers

Synchro Thrust Block 1st/2nd Gear. Porsche 911 1974-86 (915 Gearbox)

91530231502/1

Product Information

Synchro Thrust Block 1st/2nd Gear.
Supports the synchroniser and gear assembly within the gearbox, particularly relating to first and second gear. It is manufactured as a direct-fit component designed to replicate the form, fit, and function of the factory part.
Sold each, 2 required per gearbox

Fits:
Porsche 911 1974 - 1986 (915 Gearbox)

Diagram ref no 44.

Inside the 915 manual gearbox, the thrust block plays a critical role in maintaining correct alignment and support for the synchroniser assembly, particularly between first and second gears. It helps maintain correct spacing and load distribution on internal transmission components, ensuring consistent gear engagement and smooth shifts.

By accurately positioning and supporting the gears and synchronisers, this thrust block helps reduce internal wear and supports reliable transmission operation - especially under spirited driving conditions common in performance Porsche use.

Transmission internals operate under high rotational and axial loads, meaning even small variations in spacing or fit can lead to friction, wear, or mis-engagement. A worn or poorly fitting thrust block can cause:
• Gear engagement issues
• Increased synchroniser or gear wear
• Rough or imprecise shifting
• Premature transmission component failure.

Replace this transmission thrust block if you are:
• Performing a full gearbox rebuild
• Noticing rough or imprecise shifting in first/second gear
• Reassembling a gearbox with worn internal components
• Addressing synchroniser wear or axial play

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

91530231502

91530231501

91530231502

The product you are viewing cross references to these numbers

3 3 3

Main shaft seal. Porsche 911/912 1972-86

99911332740/1

Product Information

Main shaft seal, 23 x 35 x 8/11.
A rubber shaft oil seal (radial seal) for the main/input shaft of a 901/915-series gearbox. It fits around the rotating shaft and seals the interface between the rotating shaft and the gearbox housing to prevent gearbox oil leaks.
Dimensions: 23 mm (shaft diameter) × 35 mm (outer diameter) × 8/11 mm thickness (seal housing/dual-lip design).

Fits:
Porsche 911 1972 - 1973 (TYP 915) from:
G 733 7575 >>
G 723 0507 >>
G 783 0838 >>
Porsche 911 Carrera 1973 - 1986

Diagram ref no 11

This seal prevents gearbox oil from escaping around the input or main shaft, ensuring the transmission remains properly lubricated. It also blocks dirt, water, and other contaminants from entering the gearbox, helping preserve internal components and maintain correct operating pressure. By replacing a worn, hardened, or cracked original seal, it restores a clean, leak-tight barrier for reliable long-term gearbox performance.

Original gearbox seals degrade over time: rubber lips harden or crack, springs lose tension, and sealing surfaces wear. A failing main-shaft seal typically leads to:
• Gearbox oil leaks
• Loss of gearbox oil over time (low oil level)
• Contamination ingress (dirt, water), leading to accelerated gearbox wear or internal damage
• Messy drip underneath the car and gearbox housing

Replacing the seal with a correct-spec new unit restores proper sealing, preserves gearbox oil integrity, and helps prevent costly internal damage or gearbox failure.

You should replace this seal if:
• Gearbox oil leaks are visible around the input shaft or bellhousing area
• There is seepage, oil dripping, or a film of oil on the underside of gearbox or clutch area
• The old seal appears cracked, hardened, or visibly damaged
• You are doing a gearbox rebuild, overhaul or maintenance
• You notice loss of gearbox oil or suspect contamination ingress

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

99911332740

99911332740

91530238100

99911328340

The product you are viewing cross references to these numbers

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thrust piece Genuine Porsche part 91530231502