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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://design91.uk/images/schemaLogo.png https://design91.uk/images/schemaLogo.png +443456003478 https://design91.uk Facebook Instagram

Motor Sport Parts

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DISPLAYING 17 to 27 (of 27 products)
1 2
Special Offer
95011623712/2
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We can provide bolt on hydraulic slave cylinder for your Porsche 911 915 transaxle eliminating all the woes that come with a clutch cable. It can be used for both upright and inverted applications - especially nice for mid engine conversions.

Includes clutch arm, cable clevis, slave cylinder, spacer, seals and our billet slave cylinder bracket with bolts. This requires the use of the 1978 and earlier clutch fork pivot shaft.

Note: This requires a portion of the rib on the bottom of the transmission that holds the original clutch cable to be cut away on 72-77 models. To go back to a cable configuration if one so chooses can be done with a bolt on bracket.

A 3/4" clutch master cylinder is recommended - not included.

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95011623712
95011623712
950.116.237.12
95011623712

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95011623714/2
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Product Information
We can provide bolt on hydraulic slave cylinder for your Porsche 911 930 4 speed transaxle eliminating all the woes that come with a clutch cable. It can be used for both upright and inverted applications - especially nice for mid engine conversions.

Includes clutch arm, cable clevis, slave cylinder and our billet slave cylinder bracket with bolts. Please specify if your application is using a short bell housing or long bell housing transaxle as the pivot shafts for the release fork are different. We must modify the arm if you have a long bell housing transmission.

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95011623714
95011623712
950.116.237.12
95011623714

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90130122100/1
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Replacing part for 911.301.221.00 (no longer available). Made in house from billet 6061 to correct tolerances.

Genuine Porsche bearings are recommended

Fits 911/912 64-69.5 aluminium case 901 transmissions.

90130122100, 901-301-221-00

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

90130122100
90130122100
901.301.221.00

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91530302302/1
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Our billet fork cover plate replaces part 915.303.023.02 and will allow you to scavenge oil without having to drill, tap or weld to the case. Within the oil passageway is a temp sender provision that is usable even when not utilizing the scavenge port.

Features:

Proper knock off tabs/pry points for easy removal
300F VDO temp sender included
-8AN oil scavenge port (-8AN adapter included)
Uses your existing fork, studs and dowel pins
Uses stock paper gasket

Fits all Porsche 915 and 930 transmissions.

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91530302302
915.303.023.02
91530302302

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95030311101/1
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The weakest and most commonly broken shift fork in the G50 5 speed transaxle is the cast aluminium 1st/2nd shift fork.
Our newly designed fork is CNC machined beautifully from aircraft grade billet aluminium and offers the most strength over any fork in the aftermarket. Our fork will also promote enhanced lubrication to 2nd gear as it better captures the idler gear when engaged.

Fits all G50 5 speed Porsche transmissions '87-'94.
(G50/00, G50/01, G50/50, G50/03, G50/04, G50/05, G50/52, G64/00, G64/01)

Replaces part 95030311101

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95030311101
95030311101
950.303.111.01

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91530311100/1
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A direct replacement for part 915.303.111.00 and 930.303.110.02.

Machined from 6061 T6 aluminium; features a replaceable threaded insert for the supplied bolt.

Fits all Porsche 915 transaxles 72-86 and 930 4 speed transaxles 76-88.

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91530311100
91530311100
93030311002

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Special Offer
91530211200/1
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If you are rebuilding a Porsche 915 or 930 transmission it's likely the 3rd/4th shift fork is worn out.

Replacing factory part numbers 915.302.112.00 and 930.303.112.02 our part is made in house from 6061 T6 aluminum - and incorporates replaceable grade 10 hardware in the event the threads should strip.

Fits all 915 transmissions '72-'86 and all 930 transmissions '76-'88.

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91530211200
915.302.112.00
91530211200
93030311202
930.303.112.02
93030311203
930.303.112.03

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95030311304/1
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The factory cast aluminum 993 fork suffers from an inherent weakness in which the steel insert that the reverse lever actuates - is prone to failure.
The cast steel RS fork does not have this issue but it's not a billet steel one like ours...and it's less expensive.

Fits all G50 5 speed transmissions '87-'94 and all G50 6 speed transmissions '95-'98 including C4, RS, Turbo and RSR models.

(G50/00, G50/01, G50/50, G50/03, G50/04, G50/05, G50/52, G64/00, G64/01, G50/20, G50/21, G50/31, G50/31, G50/33, G64/51, G64/52)

Replaces part 950.303.113.04, 950.303.103.00, 950.303.113.04, 950.303.103.06

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95030311304
95030311304
950.303.113.04

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Special Offer
91530311301/2
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Shift fork – reverse gear and fifth gear.

Fits:
Porsche 911 F (1972 to 1973) and
Porsche 911 G (1974 to 1986) that are equipped with a 915 transmission (excluding Turbo)

Diagram ref no 22

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91530311301
15479
915.303.113.01
91530311301

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Special Order item
93030212101
Product Information
Product Information
Tensioning plate.

porsche

Fits:
Porsche 924 1978-1979 Only for 5-speed transmission
Porsche 911 G Turbo 1975-88 Only for 4-speed transmission

Click 'Zoom in' for large parts diagram.
Diagram ref no 21

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93030212101
93030212101
93030212100

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CMS.915.GT
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This update will allow for use of the late style 915 main shaft seal and o-ring on early transmissions ('72-'75) where the seal installs from the inside and the guide tube is not removable.
The update is a also good repair for those whom have loose, damaged or worn out guide tubes.

** This requires machining to fit

The original is machined off and a custom steel tube is fitted. It's further retained from the inside of the diff case with a high quality snap ring and sealed with the factory o-ring.
DISPLAYING 17 to 27 (of 27 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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