Motor Sport Parts
Note
Longer ring gear bolts may be required
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
** This requires machining to the front "nose cone" housing.
We have updated our 915 spray bar kit to include an improved oil return port that will not interfere with the torsion bar tube and allows for better routing of the oil return line.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Bearing retaining plate for 915 transmissions
Fits:
Porsche 911 '72-'86 (Not for 4-speed gearboxes)
- Precision machined
- Better support for both the main and pinion shaft bearings
- Improved design incorporates an oil groove promoting more lubrication to the input shaft bearings
- Substantial clearances for ease of assembly
- Perfect fit for bearings and assembly
- Much stronger than the original cast two piece design
Replaces parts 915 302 121 03 and 915 302 123 03
Notes:
Do not use the factory lock washers.
For use only with the 4mm flange 4 point pinion bearing 999.052.030.00
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530212303
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
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Related, superseded, cross reference or alternative numbers for comparison.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
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 914 (1970-1976)
For all 930 4 speed applications and 1978 and later 915.
Spacers are required if you are using with a factory LSD.
Replaces part 930-332-209-12
Sold in pairs.
Notes:
Factory LSD applications will require spacers, otherwise the flanges will be too short.
Designed for use with metal CV gaskets, not paper.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93033223200
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Our design features a replaceable steel threaded insert for the bolt in the event the threads should ever strip.
Fits all Porsche 915 transaxles 72-86
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530311301
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
Precision machined from T6 aluminum
Superior in strength as compared to all OEM side plates
Uses larger 930 Turbo differential taper bearing (999.059.064.00 sold separately)
Oil passageway for additional lubrication to the diff bearing
Perfect fit/no clearance issues
Adds strength and reliability to the diff section by reducing ring gear deflection
Perfect for racing and V8 applications
Fits all 915 transmissions '72-'86 excluding Euro models with oil cooler
Replaces parts 915.301.311.00, 915.301.311.04, 915.301.311.05, 915.302.311.06
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530131105
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95011623712
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530302302
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530311100
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530211200
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91530311301
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
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.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
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