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Porsche > 993 (911) (1994-1998) > 993 (911) C2 1994-97 > Gearbox / Transmission >

Gearbox Mounts

Gearbox Mounts

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DISPLAYING 17 to 27 (of 27 products)
1 2
Gearbox silencer block hexagon-head bolt lock nut. Porsche 993 C2 - 99908444509
2
Gearbox silencer block hexagon-head bolt lock nut. Porsche 993 C2
Special Order item
99908444501::2
Product Information
Product Information
Gearbox silencer block hexagon-head bolt lock nut. 
M12 x 1.5.

porsche

Fits:
Porsche 993 C2 1994-98 MANUAL (Gearbox type G50.20 / G51.21)
Porsche 993 Carrera RS 1995 MANUAL (Gearbox type G50.31 / G50.32 / G50.33)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

Click picture for large parts diagram.
Diagram Ref No 25.

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Related, superseded, cross reference or alternative numbers for comparison.

99908444501
99908444509

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Gearbox silencer block Hexagon-head bolt. Porsche 993 C2 - 90037802309, 90037808801
4
Gearbox silencer block Hexagon-head bolt. Porsche 993 C2
Special Order item
90037808801
Product Information
Product Information
Gearbox silencer block Hexagon-head bolt. M12 x 1.5 x 100.
Sold each.

Fits:
Porsche 993 C2 1994-98 MANUAL (Gearbox type G50.20 / G51.21)
Porsche 993 Carrera RS 1995 MANUAL (Gearbox type G50.31 / G50.32 / G50.33)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

Diagram Ref No 15.

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Related, superseded, cross reference or alternative numbers for comparison.

90037808801
90037802309
90037808801

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Gearbox silencer block Hexagon-head bolt. Porsche 993 C2 - 90037802309, 90037808801 - 96143
4
Gearbox silencer block Hexagon-head bolt. Porsche 993 C2
90037808801/1
Product Information
Product Information
Gearbox silencer block Hexagon-head bolt. M12 x 1.5 x 100.
Engineered to match the original Porsche specification, this high-quality bolt ensures correct fit, strength, and finish for secure attachment of the gearbox silencer block on the Porsche 993 Carrera 2 .
Sold each.

Fits:
Porsche 993 C2 1994-98 MANUAL (Gearbox type G50.20 / G51.21)
Porsche 993 Carrera RS 1995 MANUAL (Gearbox type G50.31 / G50.32 / G50.33)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

Diagram Ref No 15.

Bolts used in drivetrain and gearbox assemblies are exposed to continuous vibration, torque stress, and environmental factors such as heat and corrosion. Over time, these conditions can weaken or stretch the bolt, reducing its ability to maintain proper clamping force. Using a degraded or mismatched bolt can cause mounting misalignment, vibration, or even component failure under load.

When to replace:
• During gearbox or silencer block removal, when original bolts show corrosion, wear, or damaged threads.
•  As part of drivetrain servicing or restoration, ensuring all fasteners meet factory torque and material specifications.
•  Whenever hardware is reused or mismatched, to maintain the correct preload and structural integrity of the assembly.

Replacing this hexagon-head bolt guarantees the proper tensile strength, precise thread pitch, and corrosion resistance — restoring safe, vibration-free mounting performance in your Porsche 993 Carrera 2 or related 911 model.

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

90037808801
90037802309
90037808801

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Gearbox silencer block rubber washer. Porsche 993 / 964 - 96437525500
3
Gearbox silencer block rubber washer. Porsche 993 / 964
Special Order item
96437525500
Product Information
Product Information
Gearbox silencer block rubber washer.

porsche

Fits:
Porsche 964 C2 1990-94 MANUAL (Gearbox type G50.03 / G50.04 / G50.05)
Porsche 964 Carrera 2 RS 1992 MANUAL (Gearbox type G50.10)
Porsche 964 Turbo 1991-92 MANUAL (Gearbox type G50.52)
Porsche 993 C2 1994-98 MANUAL (Gearbox type G50.20 / G51.21)
Porsche 993 Carrera RS 1995 MANUAL (Gearbox type G50.31 / G50.32 / G50.33)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 27.

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96437525500
96437525500

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Gearbox silencer block. Porsche 964 / 993 - 96437505502, 911821/15, 96437505581
3
Gearbox silencer block. Porsche 964 / 993
Special Order item
96437505581
Product Information
Product Information
Gearbox silencer block.

Fits:
Porsche 964 C2 1990-94 MANUAL (Gearbox type G50.03 / G50.04 / G50.05)
Porsche 964 Turbo 1991-92 MANUAL (Gearbox type G50.52)
Porsche 964 C2 1992-94 TIPTRONIC (Gearbox type A50.02 / A50.03)
Porsche 993 C2 1994-98 MANUAL (Gearbox type G50.20 / G51.21)
Porsche 993 C2 1994-98 TIPTRONIC (Gearbox type A50.04 / A50.05)

Diagram Ref No 23

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

96437505581
96437505502
911821
96437505581

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Gearbox silencer block. Porsche 964 / 993 - 96437505502, 911821/15, 96437505581
3
Gearbox silencer block. Porsche 964 / 993
96437505581/1
Product Information
Product Information
Gearbox Silencer Block.
The OE Match Gearbox Silencer Block is a high-quality replacement mounting component designed to isolate and dampen vibration and noise generated by the gearbox and drivetrain. Installed between the transmission assembly and vehicle mounting points, the silencer block helps absorb drivetrain movement and reduce the transmission of vibration into the chassis and passenger compartment.

Fits:
  • Porsche 964 (911) C2 1989-93 MANUAL (Gearbox type G50.03 / G50.04 / G50.05)  TIPTRONIC (Gearbox type A50.02 / A50.03)
  • Porsche 964 (911) TURBO 3.3L 1991-93 MANUAL (Gearbox type G50.52)
  • Porsche 964 (911) TURBO 3.6L 1991-93 MANUAL (Gearbox type G50.52)
  • Porsche 993 (911) C2 1994-97  MANUAL (Gearbox type G50.20 / G51.21)  IPTRONIC (Gearbox type A50.04 / A50.05)
  • Porsche 993 (911) TURBO 1994-96 (Gearbox type G50.20 / G51.21)  IPTRONIC (Gearbox type A50.04 / A50.05)

Diagram Ref No 23

Manufactured to OE specifications using durable rubber and metal construction, this replacement silencer block restores the original levels of comfort, refinement and drivetrain support. It is an ideal replacement for worn, cracked or deteriorated original mounts commonly found on ageing Porsche vehicles.  

What This Product Does:
  • Isolates gearbox and drivetrain vibrations from the chassis.
  • Reduces transmission noise entering the passenger compartment.
  • Supports the gearbox while allowing controlled movement.
  • Helps maintain correct drivetrain alignment.
  • Minimises shock loads during acceleration and gear changes.
  • Improves driving comfort and refinement.

Symptoms Of Wear Or Failure:
  • Increased vibration felt through the cabin.
  • Excessive drivetrain movement during acceleration or deceleration.
  • Clunking or knocking noises when changing gear.
  • Harsh engagement during gear shifts.
  • Visible cracking, splitting or deterioration of the rubber mount.
  • Sagging or misalignment of the gearbox assembly.
  • Increased transmission noise within the vehicle.
  • Premature wear of surrounding drivetrain components.

Why Replacement Matters:

  • The gearbox silencer block is continuously exposed to drivetrain torque, engine vibration, road shock, heat and age-related deterioration. Over time, the rubber element can harden, crack or separate from its metal mounting surfaces, reducing its ability to absorb vibration and support the transmission correctly.
  • A failed silencer block can allow excessive gearbox movement, leading to increased vibration, drivetrain noise and additional stress on transmission mounts, couplings and related components. If left unresolved, excessive movement may contribute to accelerated wear throughout the drivetrain system.



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

96437505581
96437505502
911821
96437505581

The product you are viewing cross references to these numbers
Gearbox Support Bracket with Mount. Porsche 964 C2 / 993 C2 TIPTRONIC - 99337504100
2
Gearbox Support Bracket with Mount. Porsche 964 C2 / 993 C2 TIPTRONIC
Special Order item
99337504100
Product Information
Product Information
Gearbox Support Bracket with Mount.
porsche

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)

Click 'Zoom in' for large parts diagram.
Diagram ref no 15

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

99337504100
99337504100

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HD Transmission / gearbox mount bush. Porsche 964 / 993 C2 - 96437505502 - PR13004P, S13004P, S-13004P
3
HD Transmission / gearbox mount bush. Porsche 964 / 993 C2
96437505581/2
Product Information
Product Information
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.

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

96437505581
96437505502

The product you are viewing cross references to these numbers
HD Transmission / Gearbox Mount Bush. Porsche 964 C2 / 993 C2 - 96437505502 - PR13004P
3
HD Transmission / Gearbox Mount Bush. Porsche 964 C2 / 993 C2
96437505581/3
Product Information
Product Information
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



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

96437505581
96437505502

The product you are viewing cross references to these numbers
Securing clip ball socket. Porsche 911 / 964 / 993 - 90016901401, N 0155262, N0155262
4
Securing clip ball socket. Porsche 911 / 964 / 993
Special Order item
90016901401
Product Information
Product Information
Securing clip ball socket. 


porsche

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



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

90016901401
90016901401
N 0155262
N0155262

The product you are viewing cross references to these numbers
Upper Retaining Bracket for G50 Gearbox. Porsche 911 / 964 / 993
2
Upper Retaining Bracket for G50 Gearbox. Porsche 911 / 964 / 993
Special Order item
91160622901
Product Information
Product Information
Replacement upper retaining bracket for G50 gearbox. 

porsche

Fits:
Porsche 911 1987-89 - x2 required per vehicle.
Porsche 964 1989-94 - x1 required per vehicle.
Porsche 993 1994-98 - x1 required per vehicle.

*Please be advised, this part is for manual gearboxes only.
DISPLAYING 17 to 27 (of 27 products)
1 2
Also found on these pages
About Gearbox Mounts

Porsche Gearbox Mounts | Stability, Precision & Reduced Drivetrain Vibration

Gearbox mounts (also known as transmission mounts) are essential components that secure your Porsche’s gearbox to the chassis while isolating vibration and absorbing torque movement. These mounts play a crucial role in maintaining drivetrain alignment, smooth shifting, and overall driving comfort.

At Design911, we supply high-quality gearbox mounts and transmission mounting kits engineered to meet or exceed original performance specifications. Constructed from advanced rubber, polyurethane, or hydraulic materials, each mount provides the perfect balance of flexibility and strength — ensuring your Porsche maintains stable, refined performance under both road and track conditions.

Whether you’re restoring a classic Porsche or maintaining a modern performance model, our gearbox mounts deliver long-lasting stability, improved handling, and reduced drivetrain noise and harshness.

What Do Gearbox Mounts Do?

Gearbox mounts act as the vital connection between your Porsche’s transmission system and chassis, absorbing torque and vibration while maintaining alignment under load.

Core Functions:

  • Secure the gearbox in place under acceleration, braking, and cornering.
  • Absorb vibration and noise from the drivetrain.
  • Maintain correct driveshaft and linkage alignment.
  • Prevent excess movement that can stress surrounding components.

Without properly functioning gearbox mounts, excessive drivetrain movement can lead to harsh shifting, vibration, and even damage to exhaust, linkage, or driveshaft components.

Why Do Gearbox Mounts Fail or Wear Out?

Over time, gearbox mounts degrade due to exposure to engine heat, torque stress, and environmental factors such as oil contamination or moisture.

Common Causes of Failure Include:

  • Rubber deterioration or cracking from heat and age.
  • Hydraulic fluid leakage in fluid-filled mounts.
  • Metal fatigue in high-performance or heavy-load use.
  • Oil contamination softening rubber compounds.
  • Continuous torque stress from aggressive acceleration.

As mounts weaken, you may experience clunking noises, drivetrain vibration, gear lever movement, or difficulty shifting — all signs that your gearbox mounts need replacement.

Why Replace or Upgrade Your Gearbox Mounts?

Replacing worn gearbox mounts restores drivetrain stability, smoother shifting, and reduced vibration. Upgrading to reinforced or performance mounts enhances control and torque response, especially on tuned or track-driven Porsches.

Key Benefits:

  • Restores smooth, vibration-free gear changes.
  • Prevents drivetrain movement and component stress.
  • Improves handling precision and throttle response.
  • Reduces noise, vibration, and harshness (NVH).
  • Available in rubber, polyurethane, and performance-spec designs.
  • Ideal for maintenance, upgrades, or complete gearbox servicing.

Replacing mounts in pairs ensures balanced performance and consistent driveline alignment.

Highlights

  • Premium Porsche gearbox and transmission mounts.
  • Engineered for strength, durability, and vibration reduction.
  • Direct-fit replacements for Porsche 911, Cayman, Boxster, and others.
  • Reinforced designs for performance or track applications.
  • Reduces stress on transmission and drivetrain components.
  • Essential for smooth shifting, refinement, and drivetrain longevity.       

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