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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design91.uk/images/schemaLogo.png https://www.design91.uk/images/schemaLogo.png +443456003478 https://www.design91.uk Facebook Instagram

Motor Sport Parts

DISPLAYING 1 to 6 (of 6 products)
99630303300/1
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Redesigned the factory shift arrester with a different profile to allow 2nd gear to engage all the way every time. This will help keep 2nd gear pop outs from occurring without shimming or machining of the gears or changing the detent roller - provided your 2nd gear synchro teeth and shift sleeve are in good condition.

Replaces part 996.303.033.00

Fits all Porsche 996 C2/C4, Boxster S 986, 996T, 996 GT2, 996 GT3, 997T, 997 GT2, 997 GT3 997, GT3 RS transmissions.

G86/20, G96/00, G96/01, G96/30, G96/31, G96/50, G96/88, G96/90, G96/93, G96/96, G96/97, G97/88, G97/96

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99630303300
996.303.033.00
99630303300

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99630301001/1
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Billet aluminium 1st to 2nd gear shift fork is a direct replacement for the fork on assemblies 996.303.010.00 and 986.303.010.00.

Fits
Porsche 986 Boxster S 2000-04 (6 speed)
Porsche 996 1999-2004

G86.20, G96.00, G96.01, G96.30

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99630301001
99630301001
98630301000

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98630301300/1
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Billet aluminium shift fork is a direct replacement for the fork on assembly part number 986.303.013.00.

Fits all Boxster 6 speed transaxles G86.20

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98630301300
98630301300

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98630301500/1
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Billet aluminium shift fork is a direct replacement for the fork on assembly part number 986.303.015.00.

Fits all Boxster S 6 speed transaxles G86.2

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98630301500
98630301500

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99630131200/1
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Our aluminum side cover fits much more precisely and will not "float" - causing gear misalignment - like the factory cast ones do.
Also incorporated is a differential bearing oiling provision.

Fits all Porsche 996 and Boxster S 986 6 speed manual transmissions.

G86/20, G96/00, G96/01, G96/30, G96/31

Replaces part 996.301.312.00 or 986.301.312.00

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99630131200
996.301.312.00
986.301.312.00
99630131200
98630131200

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99630229600/1
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It's not uncommon for the original thrust washer on the main shaft between 3rd and 6th gear to fail causing serious damage inside your transmission. We now offer a stronger billet thrust washer with specially designed oil grooves which promotes lubrication to 3rd and 6th gear needle cage bearings.

Fits all Porsche 996 and Boxster S 986 transmissions. G86/20, G96/00, G96/01, G96/30, G96/31

Replaces part 996.302.296.00

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99630229600
996.302.296.00
99630229600

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DISPLAYING 1 to 6 (of 6 products)
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About Motor Sport Parts

Porsche Gearbox Motorsport Parts | Precision Components for Track-Ready Performance

Motorsport gearbox parts are engineered to deliver the precision, strength, and durability demanded by high-performance and racing environments. Designed to withstand extreme torque, heat, and rapid gear changes, these components optimise power delivery and shifting accuracy under competition conditions.

At Design911, we supply race-proven gearbox motorsport parts that meet or exceed high-performance engineering standards. Our range includes upgraded gears, bearings, selector forks, differential components, cooling systems, and reinforced casings — all precision-machined for endurance, reliability, and efficiency.

Whether you’re preparing your Porsche for competitive motorsport, endurance racing, or high-performance track use, our gearbox motorsport components provide superior response, strength, and reliability lap after lap.

What Do Motorsport Gearbox Parts Do?

Motorsport gearbox components enhance the transmission’s ability to handle increased power and aggressive driving while maintaining smooth, rapid gear engagement.

Core Functions:

  • Strengthen the drivetrain for high-torque and high-RPM use.
  • Improve gear shift speed, precision, and durability.
  • Optimise cooling and oil flow for prolonged performance.
  • Reduce friction and heat build-up under extreme load.
  • Provide improved reliability in racing and endurance conditions.

These upgrades are essential for performance-tuned Porsches that experience higher stresses than standard road use can withstand.

Why Do Standard Gearbox Components Fail in Motorsport Conditions?

Under high stress, standard gearbox parts can quickly reach their performance limits. Motorsport use exposes them to extreme conditions that accelerate wear and mechanical fatigue.

Common Causes of Failure Include:

  • Excessive heat from extended high-RPM driving.
  • Gear tooth wear or chipping under racing torque loads.
  • Oil starvation during hard cornering or acceleration.
  • Bearing fatigue due to extreme lateral and axial forces.
  • Deformation or cracking of casings from repeated stress cycles.

When standard parts are pushed beyond their design limits, they can cause shifting issues, noise, leaks, or even catastrophic gearbox failure.

Why Replace or Upgrade to Motorsport Gearbox Parts?

Upgrading to motorsport-grade gearbox components enhances performance, durability, and responsiveness — ensuring your Porsche performs flawlessly in competitive conditions.

Key Benefits:

  • Superior strength for high-power applications.
  • Enhanced cooling and lubrication for sustained performance.
  • Faster, smoother, and more precise shifting under load.
  • Increased longevity and reliability in race conditions.
  • Available for Porsche 911, Cayman, Boxster, GT3, and Cup models.
  • Perfect for performance builds, track conversions, and endurance racing.

Motorsport gearbox parts are not only replacements — they are precision upgrades that deliver consistent, race-winning reliability and performance.

Highlights

  • Motorsport-grade Porsche gearbox components.
  • Engineered for strength, precision, and endurance.
  • Ideal for road-to-track conversions or full competition use.
  • Designed for optimal oil flow, thermal stability, and torque handling.
  • Includes reinforced gears, shafts, bearings, and cooling components.
  • Proven reliability in motorsport and performance environments.       

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