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Torque Tube Bearing Bushing. Porsche 964 C4 /993 C4

Torque Tube Bearing Bushing. Porsche 964 C4 /993 C4 - 96442101221B

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96442101221B

Product Information

Torque Tube Bearing Bushing.
Restore critical drivetrain support in your Porsche 911 AWD models with this genuine-spec torque tube bearing bushing. Designed for the Porsche 964 (1989-94) C4 and 993 (1995-98) C4 series, this precision bearing support replaces the internal bushing of the torque tube and ensures your drive shaft remains aligned, smooth and free from excessive vibration. Ideal for restoring worn drive assemblies, eliminating shaft rumble or clunk, and maintaining the structural integrity of your Porsche’s AWD drivetrain.
Sold Each.
x3 Bearings Required For Torque Tube.

Fits:

Porsche 964 (911) C4 1989-93
Porsche 964 (911) TURBO 3.3L 1991-93
Porsche 964 (911) TURBO 3.6L 1991-93
Porsche 993 (911) C4 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) TURBO S 1994-97

Fits Inside Diagram Ref No 1

What This Product Does:

The bearing bushing supports the drive shaft inside the torque tube, allowing it to spin freely, in correct alignment, while the tube assembly maintains structural connection between gearbox and front differential (or transfer case) in AWD/4WD models.
It ensures smooth rotation, minimal vibration, correct alignment of the shaft, and keeps axial or radial movement within acceptable limits. This preserves drivetrain geometry, reduces wear on the shaft/flange joints and supports NVH (noise-vibration-harshness) control.
If the bearing bushing is worn or failed, the drive shaft may exhibit excessive movement, misalignment, vibrations, or clunking—leading to further accelerated wear of connected components (flanges, bearings, seals).

Symptoms & Signs Of Wear / Need For Replacement:

Vibration or grinding noise from the driveline, especially under acceleration, or at certain engine/shaft speeds—indicating the shaft is not properly supported.
Clunking or knocking when engaging drive (or during the transition of power front-to-rear) due to excessive shaft movement or misalignment.
Uneven or accelerated wear of the drive shaft flanges, U-joints or bearings because the mis-alignment has increased load on them.
Leaking seals around the torque tube or front differential input because the shaft may be oscillating more than designed and stressing the seals.
Axial or radial play when inspecting the shaft within the tube—if the bearing bushing is worn, you may see movement of the shaft where it should be tight.
Because many owners did not realise the bearings could be replaced separately, some symptoms may have been treated as drive-shaft or flange issues instead of the bearing bushing itself.

Why Replacement Matters:

Drivetrain longevity: Replacing a worn bearing bushing prevents further damage to the drive shaft, flanges, U-joints, seals and other components that suffer when alignment is compromised.
Noise-Vibration-Harshness improvements: A new bearing support helps reduce driveline vibrations and improves refinement—especially important for long-distance driving or performance use where shaft/torque tube behaviour matters.
Safety & reliability: Excessive shaft movement or failure of a support in the drivetrain can lead to catastrophic failure under load—especially in AWD models. Fixing the bearing bushing restores the designed support.
Cost-effectiveness: Previously, the only fix for a worn bearing in some models was replacing the complete torque tube (which is expensive). These individual bushings provide a more economical and practical solution.
Performance & alignment: Proper support of the drivetrain helps maintain alignment under load, ensures power delivery remains consistent, and avoids unnecessary flex in the system which can degrade handling or drivetrain feel.

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

96442101221B

96442101221

964421012X

964421012AX

The product you are viewing cross references to these numbers

Related products

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Flex disc (upgraded) for cardan driveshaft. Porsche 996 C4 / C4S / turbo / 997 C4 / C4S / turbo

99642101000

Product Information

No need to buy the entire shaft assembly any longer. Simply replace your worn out piece with our inexpensive high quality flex disc.
Direct-fit upgraded replacement for the rear flex disc (guibo) on AWD Porsche 996 Carrera 4, 4S and Turbo models. OEM cross-reference PCG42102001. Rubber body with metal bushings to isolate driveline vibration while transmitting torque smoothly. Perfect when your original guibo shows age, cracking, or causes driveline vibration/clunks.

Compatible for:

· 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

Why you should replace the flex disc

Worn rubber = vibration & driveline shock. The flex disc isolates rotational forces, as the rubber hardens, cracks or tears, it transmits vibration and can produce shuddering at idle/low speeds or a clunk during acceleration. Owners commonly report these symptoms before a failure.
Prevents secondary damage. A failed flex disc can allow excessive play between the driveshaft and transmission flange, stressing flange bolts, the driveshaft and the transmission output — leading to far more expensive repairs.
Affordable, quick fix vs replacing the whole shaft. Replacing this single part is significantly cheaper than replacing the full cardan/driveshaft assembly and restores NVH and drivability.

Common issues / failure signs

Noticeable vibration through the car (often at certain speeds or under acceleration).
Clunking or knocking from the center/rear when accelerating from low speed or shifting — typically caused by lost rubber compliance or torn bores.
Visible cracking, chunks missing, or separation of the rubber around the bolt bores (inspect visually with the car safely supported). Micro-cracks can quickly grow into failure.
Corroded or stretched mounting hardware — always inspect/replace bolts and washers when servicing the guibo.

Fits to No 8 on the diagram.

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

99642101000

99642102001

99642102050

99742102000

99742102001

99642101000

PCG42102001

The product you are viewing cross references to these numbers

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Torque Tube Bearing Bushing. Porsche 964 C4 /993 C4