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Porsche > 964 (911) (1989-1994) > Gearbox / Transmission >

Front Differential

Front Differential

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Torque tube bearing bushing Set of 3 Porsche 964 C4 /993 C4 - 96442101221, 964421012X, 964421012AX
5
Torque tube bearing bushing Set of 3 Porsche 964 C4 /993 C4
96442101221X/KIT
Product Information
Product Information
Torque tube bearing bushing Set of 3 Porsche 964 C4 /993 C4

Torque tube bushing with bearing 25mm torque tube

(3 bearings needed for torque tube) Porsche does not offer separate torque tube bearings for the 993/964, meaning if the bearings fail, your only option has been to purchase a completely new torque tube. In response, OE Match and our trusted supplier have taken the initiative to design, develop, and manufacture high-quality 993/964 torque tube bearings, now available for individual purchase

Fits:
Porsche 964 1989-94 
Porsche 993 1995-98

• Clean/sand (with sandpaper) the tube (inner part), 

• Lightly lubricate the rubber (acid-free lubricant), 
• Ensure the correct installation direction,
• Press against the outer contact surface during installation (only onto the aluminum housing),
• A high installation force will be required (press in with hydraulics) 


fits inside diagram ref no 1



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Related, superseded, cross reference or alternative numbers for comparison.

96442101221X
96442101221
964421012X
964421012AX

The product you are viewing cross references to these numbers
Seal gearbox / differential side cover plate. Porsche 911 / 964 / 993 - 99970174540
4
Seal gearbox / differential side cover plate. Porsche 911 / 964 / 993
Black Friday Sale
99970174540/1
Product Information
Product Information
Seal gearbox / differential side cover plate. 

oematch

Fits:
Cars with Manual Gearbox
Porsche 911 1987-89 G50 Gearbox
Porsche 964 1989-94 (gearbox and front differential)
Porsche 993 1995-98

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

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Related, superseded, cross reference or alternative numbers for comparison.

99970174540
99970174540

The product you are viewing cross references to these numbers
Torque tube bearing bushing Porsche 964 C4 /993 C4 - 96442101221, 964421012X, 964421012AX
6
Torque tube bearing bushing Porsche 964 C4 /993 C4
Black Friday Sale
96442101221X
Product Information
Product Information
Torque tube replacement bearing bushing Porsche 964 C4 /993 C4

Torque tube bushing with bearing 25mm torque tube

Sold individually (3 bearings needed for torque tube)

Porsche does not offer separate torque tube bearings for the 993/964, meaning if the bearings fail, your only option has been to purchase a completely new torque tube. In response, OE Match and our trusted supplier have taken the initiative to design, develop, and manufacture high-quality 993/964 torque tube bearings, now available for individual purchase  

Fits:
Porsche 964 1989-94 
Porsche 993 1995-98

• Clean/sand (with sandpaper) the tube (inner part), 

• Lightly lubricate the rubber (acid-free lubricant), 
• Ensure the correct installation direction,
• Press against the outer contact surface during installation (only onto the aluminum housing),
• A high installation force will be required (press in with hydraulics) 

fits inside diagram ref no 1

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

96442101221X
96442101221
964421012X
964421012AX

The product you are viewing cross references to these numbers
Torque Tube Bearing Bushing. Porsche 964 C4 /993 C4 - 96442101221, 964421012X, 964421012AX - 31457
2
Torque Tube Bearing Bushing. Porsche 964 C4 /993 C4
Black Friday Sale
96442101221B
Product Information
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
DISPLAYING 1 to 4 (of 4 products)
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About Front Differential

Porsche Front Differential

At Design911, we supply a wide range of front differential parts and related components for Porsche models, helping you maintain, upgrade and enjoy your car’s traction and driveline performance.

Why do Porsche Front Differential matter?

Front differentials play a key role in how power is distributed between the front wheels of all-wheel drive Porsche models, directly affecting traction, refinement and stability. Over time they can suffer from wear, noise, leaks or internal damage, especially if lubrication is compromised or the car is driven hard. Replacing tired or faulty components helps keep your Porsche driving smoothly and protects other parts of the drivetrain.

  • 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

Common options & kits

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

Brands & quality options

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.

CMS 

We specialize in Porsche transmissions, manufacturing many components and upgrades. CMS have served the Porsche community for over 35 years and continue to do so.

Elring 

The Elring aftermarket brand offers an all-embracing package with original equipment quality and functional reliability for Porsche applications.

Kits 

Design911 offers an extensive selection of package deals for Porsche parts, providing curated component combinations to support maintenance or upgrades.

OE Match 

OE Match provides a wide range of Porsche components across many systems, with catalogued OE cross-references to help select suitable parts.

Porsche 

Genuine Porsche parts are designed and tested specifically for Porsche models, helping to maintain factory feel and compatibility.

When should you review or replace your Porsche front differential?

Checking front differential condition and related components regularly helps you spot wear, damage or lubrication issues before they affect comfort, traction or lead to more expensive drivetrain repairs later on.

  • Existing parts are worn, cracked, noisy, leaking or showing signs of internal damage
  • You notice whining, vibration or grinding noises from the front drivetrain area
  • You feel instability, shuddering or inconsistent traction when accelerating or cornering
  • 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 front differential and replace anything that is past its best, so your Porsche stays dependable and enjoyable to drive.

Explore Porsche front differential with Design911

Browse front differential parts and related components for Porsche at Design911 — from individual items to complete kits — and find options to suit everyday maintenance, upgrades and full projects.

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