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Porsche > 997 (911) MK1 2005-2008 > 997 MK1 Carrera 4S 3.8L 2005-08 > Suspension Upgrades >

Gearbox mounts

Gearbox mounts

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DISPLAYING 1 to 5 (of 5 products)
Gearbox Front Mounting Bush Insert Kit. Porsche 996 / 997 Powerflex - 99737503303, 9963750303, 99637533103, 99637503302, 99737503302, 99737503301, 99637503303
3
Gearbox Front Mounting Bush Insert Kit. Porsche 996 / 997 Powerflex
PFR57-531
Product Information
Product Information
Powerflex Gearbox Front Mounting Bush Insert Kit.
Fits 996 & 997 vehicles with the twin mounting bracket (Replacement for Porsche parts number 99737503303) at the end of the gearbox.

Fits:
Porsche 996 / 997 all 3.6 & 3.8 Tiptronic models, Turbo models Manual & Tiptronic, GT2 & GT3.

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Related, superseded, cross reference or alternative numbers for comparison.

PFR57-531
99737503303
9963750303
99637533103
99637503302
99737503302
99737503301
99637503303

The product you are viewing cross references to these numbers
Gearbox Front Mounting Bush Insert Kit. Porsche 996 / 997 Powerflex Black Series - 99737503303, 9963750303, 99637533103, 99637503302, 99737503302, 99737503301, 99637503303
3
Gearbox Front Mounting Bush Insert Kit. Porsche 996 / 997 Powerflex Black Series
PFR57-531BLK
Product Information
Product Information
Powerflex Black Series Gearbox Front Mounting Bush Insert Kit.
Fits 996 & 997 vehicles with the twin mounting bracket (Replacement for Porsche parts number 99737503303) at the end of the gearbox.

Fits:
Porsche 996 / 997 all 3.6 & 3.8 Tiptronic models, Turbo models Manual & Tiptronic, GT2 & GT3

POWERFLEX Black Series bushes are manufactured using our Black 95 Shore A compound to provide maximum control of chassis geometry. 
They are designed for the Track, ready to Race and are engineered to be the best.



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Related, superseded, cross reference or alternative numbers for comparison.

PFR57-531BLK
99737503303
9963750303
99637533103
99637503302
99737503302
99737503301
99637503303

The product you are viewing cross references to these numbers
Gearbox Transmission Bushing Set, Heavy Duty. Porsche 996 / 997 - 99737503303, 99637503303, 99637533103, 99637503302, 99737503302, 99737503301 - PR13002P
3
Gearbox Transmission Bushing Set, Heavy Duty. Porsche 996 / 997
99737503303/2
Product Information
Product Information
Gearbox Transmission Bushing Set, Heavy Duty.

Improve shifting precision and driveline stability with this Gearbox / Transmission Bushing Set.
Designed for Porsche 996 and 997 models, these heavy-duty bushings replace the original soft rubber mounts with a higher-durometer compound and reinforced aluminum cores.
Sold As A Set Of 2.

Fits:

  • Porsche 996 C2 3.6L 2002-2005 (Tiptronic Transmission Only)
  • Porsche 996 C4 3.6L 2002-2005 (Tiptronic Transmission Only)
  • Porsche 996 C4S 3.6L 2002-2005 (Tiptronic Transmission Only)
  • Porsche 996 TURBO 2000-05 (Tiptronic / Manual Transmission)
  • Porsche 996 GT2 2001-05 (Tiptronic / Manual Transmission)
  • Porsche 996 GT3 MKI 1999-02 (Manual Transmission Only)
  • Porsche 996 GT3 MKII 2003>> (Manual Transmission Only)
  • Porsche 997 MK1 Carrera 2 3.6L 2005-08 (Tiptronic Transmission Only)
  • Porsche 997 MK1 Carrera 2S 3.8L 2005-08 (Tiptronic Transmission Only)
  • Porsche 997 MK1 Carrera 4 3.6L 2005-08 (Tiptronic Transmission Only)
  • Porsche 997 MK1 Carrera 4S 3.8L 2005-08 (Tiptronic Transmission Only)
  • Porsche 997 MK1 GT3 2007-09 (Manual Transmission Only)
  • Porsche 997 MKII GT3 2010-11 (Manual Transmission Only)
  • Porsche 997 MKII Turbo 2010-13 (Manual Transmission Only)
  • Porsche 997 MKII GT2 RS 2011-13 (Manual Transmission Only)

Fits On To Diagram Ref No 1

What This Product Does:
  • Support and Mount the Transmission - They hold the gearbox (transaxle) in place relative to the chassis, keeping it aligned and preventing undesired motion.
  • Absorb Vibration & Isolate Noise - The bushings dampen transmission vibration and drivetrain noise, improving comfort.
  • Control Drivetrain “Slop” / Play - Stiffer bushings reduce the amount of twist or movement under torque load, minimizing driveline lash or unwanted movement when accelerating, shifting, or off the throttle.
  • Maintain Geometry & Alignment - Properly mounted gearbox prevents shifting of driveline angles, which helps protect CV joints, driveshafts, and reduces undue stress elsewhere.

Symptoms Of Worn / Failing Transmission Bushings:
  • Clunking, knocking, or banging noises during shifts, on throttle application, or when decelerating
  • Driveline lash / slop — a sensation of delay or “slack” before power transfer
  • Increased vibration or harshness felt in the cabin, especially under load or gear changes
  • Gearbox movement — the transmission may move or twist noticeably when revs / torque change
  • Wear on adjacent components — e.g. CV joints, driveshafts, differential support bearings may see accelerated wear

Why Replacement Matters:
  • Restores Sharpness & Responsiveness — by eliminating soft or worn mounts, the drivetrain becomes more responsive and direct.
  • Reduces Noise, Vibration & Harshness — a proper bushing absorbs and isolates vibration better than degraded old rubber.
  • Protects Other Drivetrain Parts — reduces stress on CV joints, couplings, differential mounts due to movement or misalignment.
  • Preserves Safety & Durability — under high torque loads (e.g. hard driving), a weak mount can twist excessively and cause damage.
  • Better Handling Feedback — with less transmission movement, throttle transitions and engine braking feel more controlled and precise.



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

99737503303
99737503303
99637503303
99637533103
99637503302
99737503302
99737503301

The product you are viewing cross references to these numbers
Gearbox transmission bushing. Heavy duty Porsche 996 / 997 - 99737503303, 99637503303, 99637533103, 99637503302, 99737503302, 99737503301 - PR13002P, S13002P, S-13002P
3
Gearbox transmission bushing. Heavy duty Porsche 996 / 997
99737503303/1
Product Information
Product Information
Heavy duty transmission bushing for Tiptronic gearboxes.
Sold as a set with (2) bushings included per kit to complete a single car.
Type: Racing / Motorsport

Fits:
Porsche 996 C2 / C4 / C4S 2002-2005 TIPTRONIC only
Porsche 996 Turbo 2001-2005 MANUAL & TIPTRONIC
Porsche 996 GT3 MKI & MKII 2000-2005 MANUAL only

Porsche 997 C2 / C4 / C2S / C4S TIPTRONIC only
Porsche 997 Turbo MKI 2006-2009 MANUAL & TIPTRONIC
Porsche 997 Turbo MKII 2010-2013 MANUAL only
Porsche 997 GT3 MKI & MKII 2007-2013 MANUAL only


HD transmission mounts replace your OEM transmission carrier bushings with our 25% stiffer bushings**. These units install the same as factory bushings and will eliminate clunks and driveline slop often associated with original rubber units. These high quality units feature aluminum center bushings and splined outer races filled with harder durometer rubber for perfect fitment and long service life. A perfect answer for those who want less driveline play but don't want harshness associated with semi solid and solid mounts.

Fits inside Porsche OE part 99737503303, or 99637503303

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

99737503303
99737503303
99637503303
99637533103
99637503302
99737503302
99737503301

The product you are viewing cross references to these numbers
Rennline RWD Conversion spindles for Porsche 996 / 997
4
Rennline RWD Conversion spindles for Porsche 996 / 997
S151
Product Information
Product Information
Rennline RWD Conversion spindle kit.
Includes two (2) spindles.

rennline

Fits:
Porsche 996 C4 / C4S / Turbo / Turbo S
Porsche 997 C4 / C4S

PRODUCT DESCRIPTION
These RWD conversion spindles will allow you to remove your front axles, differential, and driveshaft allowing you to convert your AWD 996 or 997 to RWD. This conversion will increase the performance of your 911 by removing nearly 100 lbs. of weight while simultaneously reducing the amount of drivetrain loss. This will improve the driving dynamics to handle more akin to the infamous 911 GT3 & GT2. Due to our spindles having integrated ABS reluctor rings like the OEM c/v shafts, no ABS or PASM warning lights will ruin your fun and all electrical systems will retain full functionality. Each spindle is machined from durable carbon steel and coated with yellow zinc to prevent corrosion, ensuring our spindles will last a lifetime. This modification is completely reversible and does not require permanently modifying any parts on your car.
DISPLAYING 1 to 5 (of 5 products)
Also found on these pages
About Gearbox mounts

Enhance Your Porsche Transmission with Performance Gearbox Mounts: Technical Specifications and Benefits

Technical specifications of Performance Gearbox Mounts:

  • Performance gearbox mounts are specialized mounts designed to improve the stability, control, and overall performance of a Porsche's transmission system.
  • They are typically made from high-quality materials such as polyurethane or solid aluminum.
  • Performance gearbox mounts feature a stiffer construction compared to standard mounts, reducing transmission movement and enhancing rigidity.
  • They come in various designs and options to fit different Porsche models and transmission configurations.
  • Performance gearbox mounts are available as aftermarket upgrades or standard replacements for Porsche vehicles.

Benefits of upgrading or replacing Performance Gearbox Mounts for your Porsche:

Enhanced shifting precision: Performance gearbox mounts minimize transmission movement, resulting in improved shifting precision and accuracy, especially during high-performance driving.

Reduced drivetrain slack: Upgrading to performance mounts helps minimize drivetrain slack, ensuring quicker power delivery and smoother gear changes, leading to enhanced driving dynamics.

Improved throttle response: By reducing transmission movement and improving rigidity, performance mounts provide quicker and more precise throttle response, enhancing overall vehicle responsiveness.

Enhanced stability and control: Performance gearbox mounts contribute to improved stability and control, especially during aggressive acceleration and high-speed cornering, reducing transmission-induced weight transfer.

Reduced noise, vibration, and harshness (NVH): Stiffer gearbox mounts help reduce transmission-related vibrations and noise, resulting in a smoother and more comfortable driving experience.

At Design911, we specialize in providing the correct parts and professional advice for your Porsche. We offer a wide range of performance gearbox mounts specifically designed for Porsche models, including both aftermarket upgrades and OEM replacements. Our experienced team can assist you in selecting the appropriate mounts based on your Porsche model, year, and specific performance requirements. We understand the importance of finding the right balance between performance and comfort, and we can guide you in choosing the optimal gearbox mounts that suit your needs. With our expertise and commitment to customer satisfaction, we can help you enhance your Porsche's transmission performance, responsiveness, and overall driving experience. Contact us today to benefit from our comprehensive support and access high-quality parts tailored to your requirements.

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