Gearbox Service Parts
Transmission Oil Filter – Part ref No. 986 307 403 00
This precision-engineered transmission oil filter is designed to keep your Porsche’s gearbox operating smoothly. It traps harmful contaminants before they can enter the transmission’s valve body and fluid passages, protecting sensitive components from wear and damage. By maintaining clean transmission fluid, it helps prevent shifting problems such as delayed engagement, harsh gear changes, and overall performance decline.
Fits:Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2007>> Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98630740300
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2007>> Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98630740300
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2007>> Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98630740300
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
00004330540
The product you are viewing cross references to these numbers

DESCRIPTION:
A competition fully synthetic transmission oil formulated using a unique combination of improved chemistry and lower friction NANODRIVE additives to massively reduce friction vs a standard oil. The Millers Oils range of competition gear oils is fully synthetic and incorporates second generation NANODRIVE low friction technology to achieve winning results in both professional and nonprofessional racing.
APPLICATION:
Designed for the lubrication of competition gearboxes. Manual transmissions, synchromesh, non-synchromesh, sequential gearboxes, transfer gearboxes, transaxles and hypoid differentials without limited slip which require API GL4 or GL5 performance. Recommended for modern transmissions where fully synthetic oil is specified, especially for high performance road and track day applications. Hewland, Xtrac, Glebe Transmissions, ZF, Tran X, Elite Transmissions, Samsonas.
Note: Not suitable for plate type limited slip differentials, instead use CRX LS 75w90 NT+.
USER BENEFITS:
• Laboratory tests and results show up to a further 15% reduction in friction and up to a further 17% reduction in wear over the previous award winning NT range
• Exceptional cold flow properties for easier gear changes
• Fast lubrication flow to component extremes on start up
• Very good oxidation resistance and superior thermal stability
• Low friction/ low drag formulation to help reduce operating temperatures
• High film strength for maximum component protection
• Significantly reduces friction, temperature, wear and minimises power loss
• Triple ester formulation works synergistically for optimised film strength and anti-wear protection
• Second generation NANODRIVE low friction technology maximises torque and power
PERFORMANCE PROFILE:
• API GL4
• API GL5
• API MT-1
• MIL-PRF-2105E
• ZF TE-ML-02B
• ZF TE-ML-05B
• ZF TE-ML-07A
• ZF TE-ML-12B
• ZF TE-ML-16F
• ZF TE-ML-17B
• ZF TE-ML-19C
• ZF TE-ML-21B
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
7966
The product you are viewing cross references to these numbers

DESCRIPTION:
A fully synthetic transmission oil to provide maximum protection and fuel economy.
APPLICATION:
For use in car and light van manual gearboxes and axles where the ultimate performance gear oil is required.
USER BENEFITS:
• Will allow fuel economy of the vehicle to be maximised
• Provides outstanding protection against wear and corrosion
• Improves the quality of the gear change
• Resists the effects of high temperatures and heavy-duty use
• Allows extended service intervals to be used
PERFORMANCE PROFILE:
• API GL-4
• API GL-5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
8376
The product you are viewing cross references to these numbers
For gearboxes WITHOUT Limited Slip Differentials (LSD)

Specifically designed for racing vehicle gearboxes, including those used in track, rally, and raid events. Ideal for all mechanical transmissions, whether synchronized or non-synchronized gearboxes, gearbox/differential units, transfer gearboxes, and hypoid differentials WITHOUT limited slip differentials.
Performs exceptionally well under shock loads, heavy loads at low RPM, or moderate loads at high RPM.
PERFORMANCE:
- Standards: API GL4 & GL5 / MIL-L-2105D
- 100% synthetic extreme pressure lubricant provides superior anti-wear protection, enhanced high-temperature resistance, and extended service life.
- Zero shear loss: Maintains an unshearable oil film even under extreme conditions.
- Retains 90 grade viscosity after the KRL 20-hour shear test, meeting the SAE J306 Standard, updated in July 1998.
- Exceptional lubricating properties reduce friction and wear.
- 90 grade viscosity at high temperatures ensures excellent oil film resistance and reduces transmission noise.
- Remains fluid at low temperatures for smoother gear shifts when the gearbox is cold.
- Reduces effort required for shifting gears.
- Compatible with all types of seals and yellow metals used in gearbox design.
- Offers anti-corrosion and anti-foam properties.
RECOMMENDATIONS: Change the oil according to the manufacturer's guidelines, and adjust based on your specific usage conditions.
For gearboxes WITH Limited Slip Differentials (LSD)

Specifically designed for racing vehicle gearboxes, including those used in track, rally, and raid events. Ideal for all mechanical transmissions, whether synchronized or non-synchronized gearboxes, gearbox/differential units, transfer gearboxes, and all hypoid differentials WITH limited slip differentials.
Performs exceptionally well under shock loads, heavy loads at low RPM, or moderate loads at high RPM.
PERFORMANCE:
- Standards: API GL5
- 100% synthetic extreme pressure lubricant provides superior anti-wear protection, enhanced high-temperature resistance, and extended service life.
- Zero shear loss: Maintains an unshearable oil film even under extreme conditions.
- Retains 90 grade viscosity after the KRL 20-hour shear test, meeting the SAE J306 Standard, updated in July 1998.
- Exceptional lubricating properties reduce friction and wear.
- 90 grade viscosity at high temperatures ensures excellent oil film resistance and reduces transmission noise.
- Remains fluid at low temperatures for smoother gear shifts when the gearbox is cold.
- Reduces effort required for shifting gears.
- Compatible with all types of seals and yellow metals used in gearbox design.
- Offers anti-corrosion and anti-foam properties.
RECOMMENDATIONS: Change the oil according to the manufacturer's guidelines, and adjust based on your specific usage conditions.
For gearboxes WITH AND without Limited Slip Differentials (LSD)

Specifically designed for racing vehicle gearboxes, including those used in track, rally, and raid events. Ideal for all mechanical transmissions, whether synchronized or non-synchronized gearboxes, gearbox/differential units, transfer gearboxes, and all hypoid differentials WITH AND WITHOUT limited slip differentials.
Performs exceptionally well under shock loads, heavy loads at low RPM, or moderate loads at high RPM.
PERFORMANCE:
- Standards: API GL5
- 100% synthetic extreme pressure lubricant provides superior anti-wear protection, enhanced high-temperature resistance, and extended service life.
- Zero shear loss: Maintains an unshearable oil film even under extreme conditions.
- Retains 14 grade viscosity after the KRL 20-hour shear test, meeting the SAE J306 Standard, updated in July 1998.
- Exceptional lubricating properties reduce friction and wear.
- 90 grade viscosity at high temperatures ensures excellent oil film resistance and reduces transmission noise.
- Remains fluid at low temperatures for smoother gear shifts when the gearbox is cold.
- Reduces effort required for shifting gears.
- Compatible with all types of seals and yellow metals used in gearbox design.
- Offers anti-corrosion and anti-foam properties.
RECOMMENDATIONS: Change the oil according to the manufacturer's guidelines, and adjust based on your specific usage conditions.

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2007>> Tiptronic
Porsche 996 1998-05 Tiptronic
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98639701600
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2007>> Tiptronic
Porsche 996 1998-05 Tiptronic
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98639701600
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2007>> Tiptronic
Porsche 996 1998-05 Tiptronic
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98639701600
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 986 Boxster 1997-04 TIPTRONIC
Porsche 987 Boxster MKI 2005-08 TIPTRONIC
Porsche 987C Cayman MKI 2006-08 TIPRTONIC
Porsche 996 Carrera 2 / Carrera 4 >>2001 TIPTRONIC
Click 'Zoom in' for large parts diagram.
Diagram ref no 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98632102502
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 986 Boxster 1997-04 TIPTRONIC
Porsche 987 Boxster MKI 2005-08 TIPTRONIC
Porsche 987C Cayman MKI 2006-08 TIPRTONIC
Porsche 996 Carrera 2 / Carrera 4 >>2001 TIPTRONIC
Common Issues
Many engine oil pans, this transmission oil pan do require a gasket. Leakage Problems: Transmission fluid leaks are the most frequent issue—often from worn or degraded sealant or pan warping.
Ensure bolts are replaced and torque-tightened correctly—typically to around 10.5 ft-lb in a crosshatch pattern—to maintain even sealing pressure.
Warping/Torque Loss: Overheating or repeated torque cycles may cause minor warping, leading to fluid seepage—even if the sealant is properly applied.
Corrosion Potential: Even with rust-resistant coating, the steel construction can become susceptible to corrosion over time, especially around edges or mounting surfaces exposed to moisture.
Click 'Zoom in' for large parts diagram.
Diagram ref no 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98632102502
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Fits:
Porsche 996 C2 /C4 1998-01 Tiptronic
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-08 Tiptronic
Porsche 987C Cayman 2006-08 Tiptronic
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98639701400
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

This part number has been superseded from previous number:
- 00004320729
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
00004330513
The product you are viewing cross references to these numbers
At Design911, we supply a wide range of gearbox service parts for Porsche models, helping you maintain smooth, precise gear changes and keep your transmission performing as it should.
Why do Porsche Gearbox Service Parts matter?Gearbox service parts directly affect how cleanly and consistently your Porsche selects gears in everyday driving and under load. Over time, internal components, seals and gaskets can wear, harden or degrade, leading to notchy shifts, leaks and increased internal wear. Replacing tired or damaged parts helps your Porsche feel better cared for and can prevent small issues turning into expensive transmission repairs later on.
- Keep your Porsche looking smart rather than tired or neglected
- Help protect the surrounding area from dirt and corrosion where relevant
- Reduce minor niggles such as looseness, rattles or mismatched parts
- Support long-term enjoyment, pride of ownership and potential resale value
Individual replacement parts
Specific items to address a particular area or issue without changing everything at once.
- Ideal for targeted repairs
- Lets you replace only what is needed
- Helps keep initial costs under control
Matched sets or pairs
Components supplied together so both sides or related items are renewed at the same time.
- Consistent feel and performance
- Helps avoid uneven wear or behaviour
- A sensible choice for routine maintenance
Complete kits
Grouped parts designed to refresh a whole system or area in one go, useful for upgrades and restorations.
- Everything specified in a single package
- Saves time compared with sourcing parts individually
- Ideal when upgrading or restoring your Porsche
At Design911, we stock genuine Porsche parts where available, plus OEM-equivalent and carefully selected aftermarket brands. This lets you choose between keeping things original, adding subtle upgrades or managing budgets on everyday maintenance.
9products
We are the source of high quality and unique Porsche performance parts for both club and professional racing.
Castrol
Castrol is a long-established lubricant specialist with a strong background in high-performance and motorsport applications. Their products are widely used to support reliable lubrication and protection in demanding gearbox and drivetrain use.
Kits
Design911 offers an extensive selection of package deals for Porsche parts, providing an ideal solution for Porsche enthusiasts looking to upgrade, maintain, or personalise their models. These packages group complementary components to help ensure compatibility and convenience.
Mahle
Mahle supplies a wide range of Porsche-related powertrain components, focusing on engine and drivetrain systems, filtration and thermal management. Their products are widely used in the automotive industry and are known for consistent specification and compatibility.
Meyle
Meyle produces a broad portfolio of aftermarket components and is represented in Porsche workshops worldwide. Their range is aimed at dependable fitment and everyday reliability when servicing and maintaining Porsche models.
When should you review or replace your Porsche gearbox service parts?Checking gearbox service parts regularly helps you spot wear, damage or age-related deterioration before it affects comfort, refinement or leads to more expensive repairs later on.
- Existing parts are worn, cracked, scuffed, faded, corroded or missing
- You notice looseness, vibration or an untidy appearance around the area they sit in
- You have had related work carried out and want everything to look and feel consistent
- You want the car to feel smarter and better cared for in daily use or before resale
If any of these apply, it is a good time to review your gearbox service parts and replace anything that is past its best, so your Porsche stays dependable and enjoyable to drive.
Explore Porsche gearbox service parts with Design911Browse gearbox service parts for Porsche models at Design911 — from individual parts to complete kits — and find options to suit everyday maintenance, upgrades and full projects.