Ball Joints

Wishbone Ball Joint Front - Cotter Pin Nut.
Fits Left And Right.
Sold Each.

Fits:
Porsche 911 1969>>1989
Porsche 914 1972>>1976

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90008400402

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Cotter pin nut for wishbone ball joint front.
Designed for the front wishbone (control arm) ball joint. Engineered to original Porsche specifications, this nut ensures safe, reliable fastening of the lower ball joint to the suspension arm on Porsche 911 and 914  models.
Sold each. Fits left and right.

Fits:
Porsche 911 1969 - 1989
Porsche 914 1972 - 1976

Diagram ref no 22

The cotter pin nut fastens the lower ball joint to the front suspension arm and secures it with a locking cotter pin through the castle slots. This prevents the nut from rotating loose, maintaining safe steering and suspension geometry during operation.

Over time, nuts can wear, corrode, or lose torque retention due to repeated assembly, age, or exposure to moisture and road debris. A weakened or reused nut may compromise the ball joint’s security, leading to excessive play or unsafe suspension movement.

When to Replace:
• During front suspension rebuilds or ball joint replacement.
• If the original nut is rusted, damaged, or has distorted threads.
• Whenever the cotter pin is replaced, ensuring proper torque and locking function.

Replacing a new cotter pin nut restores factory-level safety, alignment integrity, and reliability in your classic Porsche’s suspension system.

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90008400402

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De-Cambered Ball Joint For A-Arm Kit – New Type (FI16).

Enhance cornering precision and grip with the De-Cambered Ball Joint Kit, engineered for Porsche 911 and Porsche 914 models.
This “new type” FI16 ball joint includes a built-in negative camber offset of approximately 3 mm, allowing the front suspension to maintain improved tire contact during aggressive cornering.
The result is sharper turn-in, increased lateral grip, and more consistent geometry under load — all without the need for additional camber plates or major suspension modification.
Sold As A Kit.
x2 Kits Required Per Car.

Fits:

• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
  
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  
• Porsche 911 1978-1983 3.0L / SC
  
• Porsche 911 1984-1986 3.2L 
• Porsche 911 1987-1989 3.2L G50 
• Porsche 911 1975-1977 3.0L Turbo (930)
  
• Porsche 911 1978-1989 3.3L Turbo (930) 
• Porsche 914 (1970-1976)
  
  

Diagram Ref No 17, 19, 20, 21

What This Product Does:

• Standard ball joints are neutral in camber contribution; a de-cambered joint adds a small built-in negative camber to the wheel. This helps counter camber loss under load, especially in spirited cornering or track use.
  
• The de­cambered joint helps maintain better tire contact patch under body roll, giving more consistent grip during aggressive driving.
  
• Because the offset is relatively small (e.g., 3 mm), it can be a subtle but useful tuning tool without major suspension modifications.

Typical Symptoms / Use-Case Indicators:

• Camber losses under hard cornering (e.g. inside shoulder lifting)
• You run aggressive alignment on track setups and want to preserve negative camber under load
• You want a simple way to bias the geometry slightly without major suspension changes

Why Choose A De-Cambered Joint:

• Improved Tire Contact Patch – Keeps the tire flatter to the road mid-corner.
  
• Better Cornering Balance – Reduces understeer by optimizing front grip.
  
• Maintains OEM Geometry – No structural modification needed.
  
• Durable, Race-Proven Design – Forged construction handles high loads.
  
• Enhanced Precision – Ideal for track-day cars, restorations, and spirited street driving.

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91134104905

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De-Cambered Ball Joint For A-Arm Set - (FI 18).
Upgrade your front suspension geometry with the De-Cambered Ball Joint Set (FI-18). These offset ball joints are engineered to provide an inbuilt additional 3mm negative camber bias, improving front-end grip and cornering response without the need for major suspension modifications.  
Sold As A Set.
x2 Sets Required Per Car.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

(For Cars Fitted With RS Type Suspension)

What This Product Does:

• Increases Negative Camber “by Default” - Because the stud is offset outward, the wheel gets a small amount of negative camber without requiring changes at the top strut mount. This helps maintain better contact patch under cornering forces.
• Counters Camber Loss Under Load - In cornering, body roll or suspension compression tends to reduce negative camber (i.e. flatten the tire). The de-cambered joint helps offset that loss so the inside tire stays more planted.
  
• Improves Handling Stability and Turn-In - With more negative camber under load, the front end grips better, reducing understeer and making turn-in sharper.
  
• Mild Track / Performance Tuning Without Major Mods - Rather than needing to retrofit adjustable camber plates or change strut towers, this joint gives a modest camber “boost” in a bolt-on manner.
  
• Retains Full Ball Joint Functionality - It still allows articulation (steering, suspension travel) like a normal ball joint — the offset is only in its alignment, not in its motion.
  
  

Symptoms Of Worn Or Failing Ball Joint:

• Knocking or Clunking Noises - A dull knock from the front suspension, particularly over bumps or while turning, often indicates play in the ball joint.
  
• Uneven or Excessive Tire Wear - Worn joints allow uncontrolled camber and toe changes, wearing the inside or outside edges of the front tires.
  
• Loose or Wandering Steering - When the ball joint develops play, the steering feels vague or “floaty” — the car no longer holds a consistent line through corners.
  
• Vibration or Shimmy at Speed - Free play in the joint can cause steering wheel vibration, particularly over rough surfaces.
  
• Visible Wear or Damage - Torn dust boots, leaking grease, or excessive movement when inspected during service are clear signs the joints need replacing.
  
• Inconsistent Handling Under Load - The car may feel unstable mid-corner or react unpredictably to bumps due to geometry shifts caused by worn ball joints.
  
  

Why Replacement / Upgrading Matters:

• Restores Safety & Structural Integrity - The ball joint supports the front suspension load. A failure can cause complete loss of steering control.
  
• Maintains Proper Wheel Alignment - Fresh joints eliminate unwanted camber/toe drift and keep tires correctly aligned under all loads.
  
• Improves Steering Precision - Tight, new ball joints restore that crisp Porsche steering feel and predictable handling
  
• Enhances Cornering Grip - The de-cambered design adds built-in negative camber, improving tire contact and front-end grip through corners.
  
• Prevents Secondary Wear - Worn joints increase stress on tires, control arms, and suspension bushings — leading to expensive downstream repairs.
  
• Perfect for Performance & Track Use - The offset camber geometry helps maintain optimal contact patches during high lateral loads, reducing understeer and improving lap-to-lap consistency.

Related reference numbers
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90134104704

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De-cambered ball joint for A-arm. FI 16
Incl. ball joint, hub nut, lock plate, split pin.
Providing 3mm additional negative camber.
Price is Each

Fits:
Porsche 911 1972-89 

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91134104905

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De-cambered ball joint for A-arm. FI 18 (will not fit standard shock absorber)
Incl. ball joint, hub nut, lock plate, split pin.
Providing 3mm additional negative camber.
Price is Each



Fits:
Porsche 911 RS 1974-89 (cars fitted with RS type suspension)

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90134104704

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Porsche 911 RS A-Arm Ball Joint Set (FI 18)
Restore the front suspension precision of your Porsche 911 RS with this replacement ball joint set designed for the FI 18 A-arms. Supplied with the required mounting hardware (hub nut, lock plate, split pin), this set fits the 1974-89 911 RS series and delivers original-spec performance and fitment.
Sold As A Set.
x2 Sets Required Per Car.

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

(For Cars Fitted With RS Type Suspension)

What This Product Does:

• The ball joint sits in the lower portion of the front suspension A-arm (wishbone) and provides the pivotal interface between the A-arm and the steering knuckle/hub.
• It allows controlled articulation (up/down movement of A-arm, steering motion) while keeping the hub and suspension geometry correct (camber, toe, caster).
• Because it’s a replacement for the “RS A-arm ball joint”, when worn or loose it can degrade handling, alignment, tire wear, and front-end feel.
• In essence ensures the front suspension remains tight, precise and responsive.

Symptoms Of Wear Or When To Replace:

• Clunking or knocking noises from the front suspension during cornering, over bumps, or when steering — ball joints with internal play can cause these.
  
• Uneven or excessive tyre wear on the inside or outside of the front tyres — worn ball joints allow geometry to drift under load.
  
• Loose or vague steering feel, wandering front end or less precise turn-in — again typically linked to suspension joint play.
  
• Visible rubber boot damage, grease leakage or rust around the ball joint — older 911 RS suspension components may have aged.
  
  

Why Replacement Matters:

• Restores safety & handling precision: On a high-performance classic like the Porsche 911 RS, the front suspension must be tight and accurate — a worn ball joint undermines that.
  
• Maintains correct geometry: Fresh joints help keep camber, toe and caster stable under load — vital for handling balance and tyre life.
  
• Prevents further damage: A failing ball joint can lead to increased stress on tyres, A-arms, bearings and may lead to more costly front-end repairs.

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90134104704

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Wishbone Ball Joint Front - Cotter Pin Washer.
Fits - Left and right.



Fits:
Porsche 911 1969-89
Porsche 914 1972-76

Price is for each.

Wishbone ball joint front - cotter pin.
Fits: Left and right. Sold each.



Fits:
Porsche 911 1969-89
Porsche 914 1972-76

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

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91134111907

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Wishbone ball joint front - groove nut. Fits - left and right.



Fits:
Porsche 911 1969-89
Porsche 914 1972-76

Price is for each.

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90134142501

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Wishbone ball joint front - lock plate..
Fits: Left and right.

Fits:
Porsche 911 1969-89
Porsche 914 1972-76

Price is for each.

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90134142600

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Wishbone Ball Joint Front - Split Pin.
Fits - Left and right.



Fits:
Porsche 911 1969-89
Porsche 914 1972-76

Price is for each.

Wishbone ball joint front lock plate.
Fits: Left and right.



Fits:
Porsche 911 1969-89
Porsche 914 1972-76

Price is for each.

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90134142600

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Wishbone Ball Joint Front.

Sold each - 2 required per
 
Fits: 
Porsche 911 08/1972-89
Porsche 914 08/71-02/76

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91134104906

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Wishbone ball joint hardware kits.



Fits:
Porsche 911 / 912 / 930 1972-89
Porsche 914 1972-76

Complete Your Ball Joint Installation

Complete your ball joint installation with our hardware kit. The kit includes threaded ring, pin and lock plate – all required factory hardware.

Kit Includes:
901 341 425 00 – Grooved Nut (2)
901 341 426 00 – Tab Washer (2)
N 012 521 1 – Cotter Pin (2)
911 341 119 06 – Threaded Pin (2)
Nut (2)
Flat Washer (2)

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2081501

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