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Porsche 356 (1950-1965) 356B 1959-63 Gearbox / Transmission

Rear Differential

Rear Differential

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DISPLAYING 1 to 6 (of 6 products)
Differential bearing (7210). Porsche 356 - 90005300400
3
Differential bearing (7210). Porsche 356
Special Order item
90005300400
Product Information
Product Information
Differential bearing, right. On differential housing lid.

Fits:
Porsche 356 1950-65 (7210)

Click 'Zoom in' for large parts diagram.
Diagram ref no 20

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90005300400
90005300400

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Differential bearing (7210). Porsche 356 - 90005300400
4
Differential bearing (7210). Porsche 356
90005300400/1
Product Information
Product Information
Differential bearing, right. On differential housing lid.

Fits:
Porsche 356 1950-65 (7210)

Click 'Zoom in' for large parts diagram.
Diagram ref no 20

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90005300400
90005300400

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Differential gear wheel set. Porsche 356 - 64433204301, 64433204300
5
Differential gear wheel set. Porsche 356
64433204301/1
Product Information
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Differential gear wheel set. 8 piece including 4 fullcrum plates.

Fits:
Porsche 356 all

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64433204301
64433204301
64433204300

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Differential pin / Jellybean. Porsche 356 - 71833252500, 71833252501
2
Differential pin / Jellybean. Porsche 356
Special Order item
71833252501
Product Information
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Differential pin / Jellybean.

Fits:
Porsche 356B / 356C (60-65) ZF Limited Slip Differential

Click 'Zoom in' for large parts diagram.
Diagram ref no 8

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71833252501
71833252500
71833252501

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Differential pin / Jellybean. Porsche 356 with ZF Limited Slip Differential - 71833252500, 71833252501 - JG.525.00
2
Differential pin / Jellybean. Porsche 356 with ZF Limited Slip Differential
71833252501/1
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Differential Pin / Jellybean
Sold each - 17 required per car

The OE Match Differential Pin, commonly known as the Jellybean, is a replacement sliding component for the ZF limited slip differential fitted to selected Porsche 356B and 356C models.

Fits:

  • Porsche 356B 1959-63
  • Porsche 356C 1963-65
with ZF Limited Slip Differential

Diagram ref no 8

Located within the differential locking mechanism, this small but important component helps control the transfer of drive between the rear wheels, maintaining effective limited slip differential operation.

What Does It Do?

The Jellybean is a sliding element within the ZF limited slip differential mechanism.

It works with the internal differential components to help generate the locking action, improving the distribution of drive between the rear wheels when traction differs.

Why Does It Fail?

Common causes include:

  • Wear from repeated differential operation
  • Friction between internal sliding components
  • Insufficient or incorrect lubrication
  • Contaminated gearbox oil
  • High mileage or prolonged use

When Should It Be Replaced?

Replace during differential rebuilding if the pin shows excessive wear, scoring, deformation or damage.

Worn sliding pins can affect the operation of the limited slip mechanism and contribute to inconsistent differential locking.

Checks & Installation

Inspect the differential sliding pins, mating gears and internal locking components for wear or damage.

Check gearbox oil condition and use the lubricant specified for the particular ZF differential.

Replacement should be carried out by a technician familiar with Porsche 356 gearbox and limited slip differential assemblies.

Key Features

  • Also known as a Jellybean or sliding pin
  • Designed for Porsche 356B and 356C
  • Suitable for compatible ZF limited slip differentials
  • Helps maintain correct differential locking operation
  • Ideal for gearbox restoration and differential rebuilding

Porsche 356B / 356C ZF Limited Slip Differential Parts

The ZF limited slip differential helps improve traction by controlling the difference in drive between the rear wheels.

Its internal sliding pins, commonly called Jellybeans, are essential to the operation of the locking mechanism and should be inspected during gearbox restoration or differential servicing.

The OE Match Differential Pin 71833252501 provides a replacement option for worn or damaged sliding components in compatible Porsche 356B and 356C ZF differentials.



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71833252501
71833252500
71833252501

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Limited slip differential (LSD) torque biasing. Porsche 356 - 64433204300
4
Limited slip differential (LSD) torque biasing. Porsche 356
64433204300/2
Product Information
Product Information
Limited slip differential (LSD) torque biasing. 

Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1955 to 1959
Porsche 356B - 1959 to 1963
Porsche 356C - 1963 to 1965


No Politics Racings (NPR) limited slip differential are the pinnacle in high-speed track and racing applications specifically designed to increase grip and decrease lap times. 
Our LSDs provide lock-up on both acceleration and deceleration which can be adjusted by using our exclusive dual ramp design allowing for numerous lock-up percentages to be utilized depending on track conditions and car configuration. Multiple friction disc and plain plate configurations are possible with our standard configuration being 4 friction discs and 4 plain discs and our Torque Flow model being 6 plain discs and 6 friction discs.
NPR’s aerospace technology friction discs dramatically increase the useful life of our LSDs compared to OEM versions. All vital areas of NPR LSDs are high precision ground and shot-peened for added strength and durability then, finished with an Isotropic Super Finish (REM).

  • High-Precision Gear Pockets
  • 4340 Chromoly Billet Body
  • Highly Polished (REM) Internals



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DISPLAYING 1 to 6 (of 6 products)
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About Rear Differential

Porsche Rear Differentials | Precision Power Distribution for Maximum Traction and Performance

The rear differential is one of the most critical components in your Porsche’s drivetrain. It transfers engine power from the transmission to the rear wheels while allowing them to rotate at different speeds during cornering. This ensures balanced handling, traction, and stability — essential for Porsche’s trademark driving dynamics.

At Design911, we supply high-quality rear differentials and differential components engineered to meet or exceed original performance standards. Built from precision-machined gears, hardened steel housings, and performance-grade bearings, each unit ensures smooth torque distribution and dependable strength under demanding conditions.

Whether you’re maintaining a daily driver or upgrading for track use, our Porsche rear differential parts deliver improved traction, cornering precision, and long-term reliability.

What Does the Rear Differential Do?

The rear differential balances rotational speed between the rear wheels while transmitting power from the gearbox to the axles.

Core Functions:

  • Distributes torque evenly between rear wheels.
  • Allows independent wheel rotation during turns.
  • Prevents wheel slip and loss of traction.
  • Reduces drivetrain stress and enhances stability.
  • Supports optimal cornering control and handling balance.

Without a properly functioning differential, your Porsche may experience wheel spin, vibrations, or loss of power transfer — reducing both performance and safety.

Why Do Rear Differentials Fail or Wear Out?

Over time, continuous stress, torque, and heat exposure can cause differential components to wear, leading to poor lubrication and gear damage.

Common Causes of Failure Include:

  • Low or contaminated differential oil causing friction and overheating.
  • Bearing wear leading to excessive noise or vibration.
  • Gear tooth pitting or chipping from torque overload.
  • Seal failure causing oil leaks.
  • Corrosion or fatigue from moisture intrusion.

Signs of a failing differential include whining noises, clunking on acceleration, fluid leaks, or uneven tyre wear.

Why Replace or Upgrade Your Porsche Rear Differential?

Replacing a worn or damaged differential restores power delivery, traction, and drivetrain balance. Upgrading to a performance-spec or limited-slip differential (LSD) enhances handling and control — ideal for spirited road or track driving.

Key Benefits:

  • Restores smooth, balanced power distribution.
  • Eliminates noise, vibration, and gear chatter.
  • Improves traction and acceleration out of corners.
  • Extends drivetrain longevity through precise engineering.
  • Suitable for Porsche 911, Cayman, Boxster, Panamera, and classic models.
  • Available in performance or standard specifications.

Replacing the differential during gearbox or axle servicing ensures long-term reliability and optimum drivetrain efficiency.

Highlights

  • Premium Porsche rear differentials and components.
  • Precision-engineered for torque balance and durability.
  • High-strength materials for road, race, or restoration builds.
  • Reduces noise, vibration, and harshness (NVH).
  • Ideal for upgrades, rebuilds, or performance applications.
  • Compatible with manual, Tiptronic, and PDK systems.       

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