HD Transmission / Gearbox Mount Bush. Porsche 964 C2 / 993 C2

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

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