Original Porsche Part Genuine Porsche part 99642102050

Cardan shaft
Genuine Porsche cardan shaft for selected Porsche 996 and 997 all-wheel-drive models, including Carrera 4, Carrera 4S and Turbo applications. This original Porsche cardan shaft, also known as a prop shaft or drive shaft, transfers torque through the drivetrain to support all-wheel-drive operation and smooth power delivery.

Fits: 
Porsche 996 C4 / C4S 2002 - 2005  *G96.31 6-speed manual  gearbox
Porsche 996 C4 / C4S 2002 - 2005  *A96.35 5-speed Tiptronic gearbox
Porsche 996 Turbo / S 2001 - 2005 (Z96.00)

Porsche 997.1 C4 / C4S 2006 - 2008 *G97.31 6-speed manual gearbox
Porsche 997.1 C4 / C4S 2006 - 2008 *A97.31 5-speed Tiptronic S
Porsche 997.1 Turbo 2007 - 2009
Porsche 997.2 Turbo 2010 - 2013 *PR:480  6-speed manual gearbox

Diagram ref no 8

This part is used in the all-wheel-drive drivetrain system on selected Porsche 996 and 997 models.

What This Part Does / Functions
•  Transfers torque through the AWD drivetrain
•  Connects drivetrain components between transmission / transfer output and front axle final drive
•  Supports front axle drive operation on Carrera 4, Carrera 4S and Turbo models
•  Helps maintain smooth and balanced driveline rotation
•  Replaces a worn, noisy, vibrating or failed original cardan shaft
•  Helps reduce drivetrain vibration, knocking or shudder
•  Provides correct Genuine Porsche length, balance and joint specification
•  Supports factory Porsche AWD performance and driveline refinement.

Why Replace This Part?
The cardan shaft is a high-speed rotating drivetrain component. It is exposed to torque load, vibration, road conditions, heat and continuous movement. Over time, joints, boots, flanges or balance characteristics can wear or become damaged. A worn or incorrect shaft can cause vibration, knocking, rumbling or shudder under acceleration.

Replacing it with a Genuine Porsche cardan shaft helps restore correct AWD driveline operation, smooth torque transfer and OE Porsche drivetrain quality.

Common Symptoms of a Faulty Cardan Shaft
•  Driveline vibration under acceleration
•  Vibration at certain road speeds
•  Knocking or clunking from underneath the vehicle
•  Shudder during take-up of drive
•  Rumbling or bearing noise from the driveline area
•  Excess play in shaft joints or flanges
•  Split or damaged cardan shaft boot
•  Damage after underside impact
•  Fault confirmed during drivetrain inspection.

When to Replace This Part
•   If vibration or knocking is traced to the cardan shaft
•   If the shaft is damaged, bent or out of balance
•   If joints, boots or flanges have excessive wear
•   During AWD drivetrain repair or overhaul
•   After underside impact or accident damage
•   If the original shaft has failed inspection
•   When replacing related front axle final drive, transmission or driveline components.

Where It Fits on the Car
This cardan shaft fits in the AWD drivetrain / front axle final drive system. It connects the drivetrain output to the front axle final drive, allowing the vehicle’s all-wheel-drive system to transfer torque to the front axle.

Correct installation, alignment and torque settings are essential to prevent vibration and ensure smooth drivetrain operation.

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

99742102001

The product you are viewing cross references to these numbers

Upgraded Cardan Driveshaft Flex Disc (Guibo)

Restore smooth, vibration-free power delivery with this OE Match Upgraded Cardan Driveshaft Flex Disc (Guibo).

Fits:

• Porsche 996 C4 3.4L 1997-08/01
• Porsche 996 C4 3.6L 09/01-2005
• Porsche 996 C4S 3.6L 09/01-2005
• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08
• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MKII Turbo 2010-13

Fits to No 8 on the diagram

This direct-fit upgraded replacement eliminates the need to purchase an expensive complete propshaft assembly. Instead, simply replace the worn rear flex disc with this high-quality OE Match component, restoring the smooth driveline performance your Porsche was designed to deliver while saving hundreds over replacing the complete shaft.

Manufactured using a durable reinforced rubber body with precision-engineered steel bushings, this upgraded flex disc effectively absorbs drivetrain shock and vibration while transmitting engine torque smoothly through the AWD driveline.

What Does the Flex Disc (Guibo) Do?

The flex disc, also known as the guibo, connects the rear section of the cardan driveshaft to the drivetrain while allowing controlled flexibility during operation.

Its primary functions include:

• Transmitting engine torque from the gearbox to the driveshaft.
• Absorbing driveline shock loads. Reducing drivetrain vibration.
• Minimising transmission noise.
• Compensating for slight driveline movement.
• Protecting the transmission, differential and propshaft from excessive stress.
• Delivering smooth power transfer through the AWD system.

Without a correctly functioning flex disc, excessive vibration and driveline shock can rapidly accelerate wear of surrounding components.

Why Do Flex Discs Fail?

The flex disc operates under constant torsional load and is exposed to significant heat and drivetrain movement. Over time, the rubber element naturally deteriorates.

Common causes include:

• Age-related rubber degradation.
• Repeated torque loading.
• Heat from the transmission and exhaust system.
• Oil contamination. High mileage.
• Aggressive driving.
• Hard launches.
• General material fatigue.

Eventually the rubber develops cracks, loses flexibility and allows excessive movement within the driveline.

Symptoms of a Worn Flex Disc

A failing flex disc commonly causes:

• Clunking noises when accelerating or changing gear.
• Driveline vibration.
• Knocking during take-off.
• Excessive drivetrain movement.
• Jerky power delivery.
• Visible cracks in the rubber coupling.
• Deteriorated rubber around the metal bushes.

Replacing the flex disc before complete failure helps prevent damage to the propshaft, differential and transmission.

When Should the Flex Disc Be Replaced?

Replacement is recommended whenever:

• Cracks appear in the rubber body.
• Driveline vibration develops.
• Clunking noises occur during acceleration or gear changes.
• The propshaft is removed for servicing.
• During clutch or transmission work.
• High mileage vehicles are undergoing preventative maintenance.
• Excessive movement is detected during inspection.

Replacing a worn flex disc restores smooth drivetrain operation and protects expensive AWD transmission components.

Why Choose This Upgraded OE Match Flex Disc?

Unlike replacing the complete propshaft assembly, this upgraded OE Match flex disc provides a cost-effective repair while maintaining OE fitment and performance.

Benefits include:

• Direct-fit replacement.
• Upgraded reinforced construction.
• High-strength rubber compound.
• Precision steel bushings.
• Excellent vibration isolation.
• Smooth torque transmission.
• Significant cost saving over complete driveshaft replacement.
• OE-quality fit and reliability.       

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

99642101000

The product you are viewing cross references to these numbers

No need to buy the entire shaft assembly any longer. Simply replace your worn out piece with our inexpensive high quality flex disc.

Fits:
Porsche 996 C4
Porsche 996 C4S
Porsche 996 TT

Fits to No 8 on the diagram.

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

PCG42102001

The product you are viewing cross references to these numbers

OE Match Cardan Shaft
OE Match cardan shaft for selected Porsche 996 and 997 Carrera 4, Carrera 4S and Turbo applications. This replacement prop shaft carries rotational drive to the front differential within the all-wheel-drive system.

Fits:
Porsche 996 C4 / C4S 2002 - 2005 *G96.31 6-speed manual gearbox
Porsche 996 C4 / C4S 2002 - 2005 *A96.35 5-speed Tiptronic gearbox
Porsche 996 Turbo / S 2001 - 2005 (Z96.00)

Porsche 997.1 C4 / C4S 2006 - 2008 *G97.31 6-speed manual gearbox
Porsche 997.1 C4 / C4S 2006 - 2008 *A97.31 5-speed Tiptronic S
Porsche 997.1 Turbo 2007 - 2009
Porsche 997.2 Turbo 2010 - 2013 *PR:480 6-speed manual gearbox

Diagram ref no 8

What This Product Does

Also called a propeller shaft, the cardan shaft links the transmission output with the front-axle final drive on the specified AWD applications. It rotates under load to convey torque between these assemblies; it is not a differential or an individual wheel driveshaft.

Functions

• Conveys rotational drive towards the front differential.
• Links the transmission output and front final-drive assembly.
• Replaces a shaft identified as worn or damaged during inspection.

Technical Details

• OE Match replacement
• Reference number: 99742102001.

Symptoms of Fault

• Vibration as road speed rises or during acceleration.
• Clunks beneath the car when drive takes up.
• Shudder when moving away.
• Rumbling around the driveline.
• Excessive movement at shaft connections.
• Grease escaping around a joint or a torn gaiter.
• Visible deformation, corrosion or underside impact damage.

Why Replacement Matters

Renewal may be appropriate when inspection traces noise or vibration to shaft wear, joint damage or distortion. These symptoms can also originate from tyres, wheels or drivetrain mountings, so establish the cause before replacing the shaft. During an AWD overhaul, assess the associated connections, gaiter and fixings rather than assuming they are included with this component.

Where it fits on the car

This cardan shaft fits within the all-wheel-drive transmission / driveline system, transferring drive towards the front axle on applicable Porsche 996 and 997 models.

FAQs

Does vibration confirm a shaft fault?
No. Wheel and tyre problems, as well as worn engine, gearbox or differential mountings, can produce similar symptoms.

Can the existing shaft be repaired?
Repairability depends on its construction and condition. A driveline specialist should assess joint wear, damage and balance before recommending repair or replacement.

What should be checked before fitting?
Confirm the part reference, transmission code and applicable equipment codes. Follow the vehicle-specific fitting procedure for orientation, alignment and tightening torques.

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

99742102001

The product you are viewing cross references to these numbers