Please wait… 
Please wait while we process your order,
do not press the back button… 
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 1 (of 1 products)
CMS.914.18T
Product Information
Product Information
Finally, conversion axle flanges for early 911s and 914s. These are machined in house from 4340 billet steel and heat treated.

Our custom "coarse spline/18 spline" drive flanges will allow 930 or G50 CV joints (with metal grease caps) to bolt up to the early 1969-75 911s and all 914 transaxles.

Shaft length was designed with the stock open diff in mind. If by off-chance you have a factory LSD, spacers will be required.

Sold in pairs.

Fits
Porsche 911 - 1969 to 1975
Porsche 914

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Related, superseded, cross reference or alternative numbers for comparison.

CMS.914.18T
90133223200
PCG33222300
91433222301

The product you are viewing cross references to these numbers
DISPLAYING 1 to 1 (of 1 products)
Also found on these pages
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.       

You may also like
Popular Models