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Gearbox Casing / Casing Parts
By OE Match
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Its function is to act as a primary seal to retain oil around the input (main) shaft of a manual transmission, preventing fluid leaks and protecting driveline components.
Fits:
Porsche 911 Carrera / Turbo 1987 - 1989
Porsche 964 Carrera / Turbo 1989 - 1994
Porsche 993 Carrera / Turbo 1995 - 1998
Porsche 996 Turbo / GT2 / GT3 2001 - 2005
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 2010 - 2013
Porsche 996 GT3 1999 - 2005
Porsche 997 GT3 2007 - 2011
Diagram ref no 12
Application:
• Manual transmission input shaft oil seal
• Cross-referenced with superseded part number: 99911332640
The input shaft seal sits around the input/main shaft where it enters the transmission case. Its job is to keep transmission fluid from leaking out and to prevent contamination from entering the gearbox. By maintaining a secure seal around the rotating shaft, this component helps preserve optimal lubrication, reduce wear, and support smooth gear operation.
In a manual transmission, the input shaft takes power from the clutch and delivers it into the gearbox. The seal must endure rotation, pressure changes, heat, and exposure to transmission fluid, forming a durable barrier that keeps oil inside while preventing dirt and debris from entering. A properly functioning input shaft seal is crucial for transmission longevity and performance.
Over time and mileage, seals can harden, crack, or lose elasticity due to heat, oil exposure, and mechanical wear. A failed input shaft seal can lead to:
• Transmission fluid leaks
• Low fluid levels
• Increased gearbox noise
• Premature wear on gears and bearings
• Potential drivetrain damage
Replacing worn or leaking seals restores proper fluid containment and protects the integrity of the transmission system, preserving performance and reducing the risk of costly repairs.
Replace the input shaft seal if you notice:
• Visible transmission fluid leaks at the bellhousing area
• Low transmission fluid levels
• Gearbox whine or unusual noises
• Transmission slipping or crunching in gear shifts
• After transmission removal or overhaul
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99911332641
The product you are viewing cross references to these numbers
OEMatch Gearbox Casing / Casing Parts — Engagement, Smoothness, Control
OEMatch gearbox casings and casing parts for Porsche models provide the structural housing and sealing surfaces that support gears, shafts and bearings. These items are specified for correct alignment, oil containment and thermal stability to help maintain transmission operation across road and competition use.
Available Types
- Full gearbox casings in aluminium and magnesium
- Case covers and extension housings
- Sealing surfaces, gaskets and oil seals
Understanding OEMatch Gearbox Casing / Casing Parts
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original gearbox casings and casing parts. OE (Original Equipment) refers to parts matching original specifications for the gearbox casings and casing parts and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM gearbox casings and casing parts engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
OEMatch also catalogues over 4,000 part numbers and more than 8,700 OE cross-references to support repairs across Porsche generations. The casing itself is the structural foundation of a Porsche transmission: it locates bearings and shafts, supports gearsets, retains lubricant and helps control operating temperature.
Benefits Include
- Structural support and precise alignment of internal gearbox components
- Reliable sealing to prevent oil loss and contamination
- Improved heat dissipation and resistance to distortion
Why Gearbox Casing / Casing Parts Wear and Fail
- Cracks or fractures from impact, fatigue or over-torqued fasteners
- Corrosion or oxidation, particularly with older magnesium parts
- Warping or distortion due to overheating or thermal cycling
- Damaged sealing faces or degraded gaskets leading to leaks
The Importance of Replacing with OEMatch Gearbox Casing / Casing Parts
Replacing a damaged or worn gearbox casing restores structural integrity, corrects alignment and prevents oil leaks that would otherwise accelerate wear on gears and bearings. For Porsche transmissions, correct mating surfaces and sealing are essential to maintain lubrication, reduce vibration and preserve gear engagement. During rebuilds or when repairing impact damage, a suitable replacement casing helps retain original clearances and supports long-term drivetrain function.
Advantages
- Direct-fit replacements engineered to match original dimensions and tolerances
- Manufactured from materials and processes suited to transmission loads and thermal demands
- Coverage that includes classic and later Porsche models to support rebuilds and repairs
Support & Advice
Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. Check alignment and sealing surfaces during assembly and confirm correct oil type and level after refit. If you are unsure about specific assembly steps, seek professional installation.
