Gearbox Mounts

Gearbox Support Bearing Bracket Hexagon-Head Bolt. A8.4
This washer sits under the hexagon-head gearbox support bolt, spreading load and providing a smooth, vibration-resistant surface between the bolt head and the support bracket. It ensures that the gearbox support bearing bracket is held securely to the chassis or transmission housing, helping maintain correct gearbox alignment and reducing the risk of loosening under engine and drivetrain load
Sold individually

Fits:
Porsche 964 C4 1989 - 1994 MANUAL (Gearbox type G64.00 / G64.01 / G64.02)
Porsche 993 C4 / C4S 1995 - 1998 MANUAL (Gearbox type G64.20 / G64.21)
Porsche 993 TURBO 1995 - 1998 MANUAL (Gearbox type G64.51 / G64.52)

Diagram Ref No 12

Functions & Technical Role:
• Load distribution: Spreads clamping force from the gearbox support bolt to prevent localized stress on the bracket surface.
• Vibration resistance: Helps maintain bolt preload under road vibration and drivetrain movement.
• Corrosion resistance: Genuine Porsche washer material meets factory durability standards.
• Correct OEM fit: Matches Porsche’s original diameter and thickness for this specific application.

Fitment / Position on Car
•  Installed on: Gearbox support bearing bracket assembly
•  Quantity required: Typically 1 washer per gearbox support bolt (verify per model and service manual)




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90002500703

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Gearbox Support Bearing Bracket Hexagon-Head Bolt. A12.1 x 26/26


Fits:
Porsche 964 C4 1989-94 MANUAL (Gearbox type G64.00 / G64.01 / G64.02)
Porsche 993 C4 / C4S 1995-98 MANUAL (Gearbox type G64.20 / G64.21)
Porsche 993 TURBO 1995-98 MANUAL (Gearbox type G64.51 / G64.52)

Click picture for large parts diagram.
Diagram Ref No 12

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Gearbox Support Bearing Bracket Stop.


Fits:
Porsche 964 C4 1989-94 MANUAL (Gearbox type G64.00 / G64.01 / G64.02)
Porsche 993 C4 / C4S 1995-98 MANUAL (Gearbox type G64.20 / G64.21)
Porsche 993 TURBO 1995-98 MANUAL (Gearbox type G64.51 / G64.52)

Click picture for large parts diagram.
Diagram Ref No 10

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96437518301

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Gearbox Support Bearing Bracket.


Fits:
Porsche 964 C4 1989-94 MANUAL (Gearbox type G64.00 / G64.01 / G64.02)
Porsche 993 C4 / C4S 1995-98 MANUAL (Gearbox type G64.20 / G64.21)
Porsche 993 TURBO 1995-98 MANUAL (Gearbox type G64.51 / G64.52)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 9

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96437505301

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Gearbox Support Bracket with Mount.


Fits:
Porsche 964 C2 1992-94 TIPTRONIC (Gearbox type A50.02 / A50.03)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

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Diagram ref no 15

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99337504100

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HD Transmission / gearbox mount bush
Sold individually, one per car.

Fits:
Porsche 964 / 993 C2 Only

High Density transmission mounts are the perfect compromise between stock rubber and our Semi-Solid mounts. Their heavy duty 25% higher durometer rubber construction makes them ideal for performance oriented cars but still allows absorption of vibrations and noise associated with solid mounts. Installs in stock transmission mount bracket replacing worn out factory rubber.

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HD Transmission / Gearbox Mount Bush.
Enhance drivetrain control and shifting precision with the HD Transmission / Gearbox Mount Bush.
Engineered for Porsche 964 and 993 C2 models, this heavy-duty mount replaces the soft factory bushing with a stiffer, high-durometer rubber compound that improves gearbox stability and alignment under load.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 993 (911) C2 1994-97

Diagram Ref No 23

What This Product Does:

• Support & Locating Function - The mount holds the gearbox housing in its proper position relative to the chassis. It resists movement under torque, acceleration, braking, or other loads.
• Vibration Damping / Noise Isolation - The rubber or elastomer absorbs vibration and noise from the transmission so that it doesn’t transmit harshly into the cabin.
  
• Control Twist / Deflection Under Load - Under torque or rapid load changes, the transmission tends to twist or shift slightly. A good mount restrains that movement, preserving alignment and reducing strain on connected parts (driveshafts, couplings, etc.).
  
• Maintain Drivetrain Geometry - By limiting excessive movement, it helps maintain the correct angles and alignment of drivetrain components, which is important for durability and performance.
  
  

Symptoms Of Worn Or Weak Mounts:

• Thumping, clunking, or bangs when shifting gears, accelerating, or decelerating
  
• Excessive vibration or harshness in the cabin, especially at idle or under load
  
• Gear lever play or misalignment under load
  
• Delayed or vague shift feel, due to movement or flex in the mount
  
• Wear on drivetrain components, as undue movement induces stress in shafts, joints, couplings
  
• Mount failure (cracks, splitting, excessive deformation) visible on inspection
  
  

Why The HD Version Upgrade Matters:

• Tighter drivetrain response — less flex means more immediate reaction during shifting or throttle transitions
  
• Improved alignment consistency — better control of the gearbox position helps preserve ideal geometry under stress
  
• Reduced noise and slop — sharper operation, less perceptible movement
  
• Better durability — stiffer (HD) rubber resists aging, compression set, and breakdown better than older soft rubber
  
• Balanced vibration control — while firmer than stock, remains less harsh than fully solid mounts, striking a good compromise for street / performance use
  
• Straightforward replacement — fits into the stock bracket, so installation is simpler than aftermarket custom mounting

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HD Transmission / gearbox mount bush.
Sold individually, 1 bushing per car.

Fits:
Porsche 964 C4 Only

HD transmission mounts for your 964 C4 can provide significant performance benefits to any owner. These mounts are constructed from 25% stiffer rubber than stock, offering an RS comparable part at a fraction of the price. Thanks to their rubber construction, these mounts can offer these benefits all without significantly increased NVH. This makes them an ideal upgrade for those with worn original parts who want significantly improved shifter feel and weight transfer properties. All of these benefits come without making your car feel like a racecar like semi-solid or solid mounts tend to do. If you are going to be going through the effort of changing the transmission bushing, you definitely don't want to miss the chance to make this sensible, inexpensive upgrade.

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HD Transmission / Gearbox Mount Bush.
Eliminate drivetrain slop and restore crisp gear changes with this HD Transmission / Gearbox Mount Bush.
Designed for the Porsche 964 C4, this heavy-duty mount uses a stiffer, high-durometer rubber compound (approximately 25 % firmer than factory rubber) to control gearbox motion and maintain precise alignment under load.
Sold Each.

Fits:

• Porsche 964 (911) C4 1989-93

Diagram Ref No 23

What This Product Does:

• Securing the Transmission - It keeps the transmission firmly in place, resisting movement under torque, acceleration, or deceleration.
• Absorbing Vibration & Noise - The rubber or elastomer element isolates drivetrain vibrations so they don't transmit harshly into the cabin.
  
• Controlling Movement / Deflection - Under load, transmissions tend to twist or shift slightly. A stiffer mount reduces that movement, improving shift feel, drivetrain alignment, and response.
  
• Maintaining Drivetrain Geometry - By limiting transmission motion, it helps preserve correct angles and alignment of drive shafts, couplings, and linkage.
  
  

Symptoms Of A Failing Or Weak Transmission Mount Bushing:

• Clunks or thuds when shifting or applying torque
  
• Movement or slop in the transmission under load
  
• Delays or vagueness in shifts due to misalignment
  
• Excess vibration or drivetrain shake in the cabin
  
• Wear or stress on driveline components (e.g. drive shafts, joints)
  
• The transmission might feel “loose” under acceleration or deceleration

Why Upgrading Matters:

• Improved Shift Feel & Precision - A stiffer mount reduces movement that can dull shift quality or introduce slack.
  
• Better Drivetrain Alignment Under Load - Less motion keeps the transmission geometry stable, which protects driveshafts, joints, and couplers.
  
• Sharper Response - With less flex, the car responds more directly to throttle inputs without drivetrain “lag.”
  
• Balance of Comfort and Control - The HD rubber design offers more rigidity than stock but isn’t as harsh as solid mounts, so you still retain usable vibration isolation.
  
• Durability - A stiffer compound is more resistant to deformation, aging, oil, and heat, giving longer service life.
  
• Cost-Effective Upgrade - If the original bushing is degraded, installing an HD version is often a worthwhile performance upgrade.

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Securing clip ball socket. 

Fits:
Porsche 911 - 1978 to 1989
Porsche 964 - 1989 to 1994 
Porsche 993 - 1994 to 1998

Click 'Zoom in' for large parts diagram.
Diagram ref no 12

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High-quality OE Match transmission mount for Porsche 964 Carrera 2 and Porsche 993 Carrera 2 models. Designed as a stock replacement, this transmission mounting is intended to restore the original-style support, vibration isolation and drivetrain control of the factory rubber mount.
Sold individually (incl. spacers), 1 pcs required per car

Fits:
Porsche 964 C2 only
Porsche 993 C2 Only

Diagram ref no 23

The transmission mount secures the gearbox in the correct position relative to the chassis while allowing a controlled amount of movement. Its rubber construction helps absorb drivetrain vibration and harshness before they are transmitted into the vehicle body, making it particularly suitable for road cars where factory-style comfort and refinement are preferred.

Over time, the original rubber transmission mount can soften, crack or deteriorate. This can allow excessive gearbox movement under acceleration, braking and gear changes, potentially affecting shift quality and placing additional stress on surrounding drivetrain components.

Replacing a worn mount with this OE Match stock-specification unit helps restore correct gearbox support and the refined drivetrain behaviour expected from a road-going Porsche 964 or 993 Carrera 2.

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96437505581

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High-quality transmission mount for Porsche 964 Carrera 2 and Porsche 993 Carrera 2 models. Designed as a stock replacement, this transmission mounting is intended to restore the original-style support, vibration isolation and drivetrain control of the factory rubber mount.
Sold individually (incl. spacers), 1 pcs required per car

Fits:
Porsche 964 C2 only
Porsche 993 C2 Only

Diagram ref no 23


The transmission mount supports the gearbox against the chassis while permitting controlled movement under acceleration, braking and gear changes. Its rubber element isolates drivetrain vibration and helps maintain the intended transmission position and alignment. 

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Transmission Case Strut - LEFT.

Fits:
Porsche 964 1989-94 

Diagram ref no 25

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Fits:
Porsche 964 1989-94

Diagram ref no 25

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Fits:
Porsche 964 1989-94 all models

Click 'Zoom in' for large parts diagram.
Diagram ref no 24

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Transmission mount and bracket.

Fits:
Porsche 964 C4 for vehicles with G64.00/01/02

Diagram ref no 1

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