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Ball Joints
- 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)
This groove nut is used to secure the front lower wishbone (A-arm) ball joint on classic Porsche suspension systems. Manufactured to the exact dimensions and thread specifications of the original Porsche part, it provides reliable clamping strength and precise seating of the ball joint within the control arm.
SET OF 2, each vehicle requires two for a complete front axle set.
Fits:
Porsche 911 1969 - 1989
Porsche 914 1972 - 1976
Diagram ref no 17
This groove nut locks the ball joint securely into the front wishbone, maintaining correct alignment and preventing movement under cornering loads and braking forces. Its machined groove design allows for proper engagement with a locking ring or pin, ensuring long-term stability and safety.
With age, the original groove nut may corrode, lose thread integrity, or deform during removal. Using a worn or non-spec nut can lead to incorrect torque, potential loosening, or suspension play.
Replace when:
• Replacing the front ball joints or wishbone assemblies
• The threads are damaged, corroded, or rounded
• Performing a front suspension rebuild or alignment correction
Installing a fresh groove nut ensures proper torque retention, precise alignment, and dependable suspension performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90134142501
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Upgrade your front suspension precision with this de-cambered ball joint, designed for early Porsche 911 and 914 models (1968-72) using the FI16 suspension system. This ball joint features an offset mounting position, delivering approx 3 mm additional negative camber per side, improving front end grip and cornering response.
Sold Each.
x2 Required Per Car.
Fits:
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Diagram Ref No 13, 15, 16, 17
What This Product Does:
- By offsetting the ball joint mounting location, the bottom of the strut / control arm is moved slightly outward, thereby increasing the negative camber angle of the front wheels (camber meaning the top of the tire tilts inward). This helps maintain better contact patch under cornering or when the car is loaded laterally.
- Improves front end grip and handling when cornering heavily by limiting camber loss under load.
- Because it uses upgraded hardware, it ensures the A-arm to spindle connection remains precise, reducing deflection or unwanted movement compared to worn standard joints.
Symptoms & When You Might Need It:
- If you’ve lowered the front of the car, added stiffer springs or anti-roll bars, you may find the standard camber spec is insufficient — tires may roll onto the outer edge when cornering. This de-cambered joint helps adjust for that.
- Worn or loose ball joints can cause front end play, knocking noises when the steering is turned or when hitting bumps, and uneven tire wear (especially on the inner or outer shoulder). The upgrade version helps eliminate play and adjust geometry.
- Loss of front negative camber under lateral load: you might notice less cornering grip, front tires scrub or overheat on the outer edge, or the car understeers more than normal.
- Visible wear: when inspecting, you might find the original ball joint housing is worn, the stud loosened, rubber boots torn, or excessive play when lifting the wheel and wiggling the control arm.
Why This Upgrade Matters:
- For enthusiasts, track-day users or cars modified with lowered suspension and stiffer springs, the factory ball joint may no longer allow optimal camber and geometry settings. This de-cambered version gives a relatively easy bolt-in method to move the geometry in the right direction without major suspension redesign.
- It offers both improved handling (by more negative camber) and also improved front end stability and precision (by replacing worn or standard joints with a stronger, correctly designed part).
- Considering the age of 911/914 front suspension components, renewing joints such as this one is a worthwhile investment in safety, longevity and driving feel.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90134104904
The product you are viewing cross references to these numbers
- 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)
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:
Diagram Ref No 17, 19, 20, 21
What This Product Does:
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.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91134104905
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Incl. ball joint, hub nut, lock plate, split pin.
Providing 3mm additional negative camber.
Price is Each
Fits:
Porsche 911 1968-72
Diagram ref no 13, 15, 16 and 17
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90134104904
The product you are viewing cross references to these numbers
- 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)
Incl. ball joint, hub nut, lock plate, split pin.
Providing 3mm additional negative camber.
Price is Each
Fits:
Porsche 911 1972-89
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91134104905
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Priced Per Pair.
Fits:
Porsche 911/912/914 1968-71
Rennline Decambered Ball Joints are a track ready solutions for 911/912/914 owners looking to perfect their suspension setup. These Decambered Ball Joints rectify the problem of limited camber adjustment on the top of the strut by moving the bottom of the strut further from the body. With the same upper strut mount location these ball joints alone can gain up to -.75° of camber and gain .5" of track width improving the stance and stability of the front end all at once. Combine these with Rennline adjustable camber plates and monoball mounts for maximum adjustability on the track and the street. These are a perfect compliment for any street or track suspension, and are a must have for those looking to precisely dial in the ultimate alignment setup. Kit includes backing plate/ring, bottom locking plate and cotter pin to secure locking plate. Everything you need for a factory correct install.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
S0300XEARLY
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
Fits: Left and right.
Fits:
Porsche 911 1969-89
Porsche 914 1972-76
Price is for each.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90134142600
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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 914 (1970-1976)
Restore your Porsche’s legendary steering feel with the Front Wishbone Ball Joint Kit — the updated “New Type (FI16)” design used on 911 and 914 models.
The ball joint links the front lower wishbone (A-arm) to the steering knuckle, allowing controlled pivoting as the suspension moves. It maintains precise wheel geometry and ensures responsive handling.
Sold Each.
x2 Kits Required Per Car.
Fits:
Diagram Ref No 13, 15, 16, 17
What This Product Does:
Symptoms Of Wear Or Failure:
- Steering play / looseness — the steering may feel vague or “sloppy.”
- Knocking or clunk noises — a distinct knock over bumps or during suspension travel.
- Uneven or rapid tire wear — particularly on the front tires, due to misalignment or movement under load.
- Vibration or shimmy — especially during cornering or when driving over uneven surfaces.
- Borderline geometry shifts — alignment may change subtly when load is applied or when cornering.
- Reduced road feel / control — the front end may feel less precise or less responsive.
- Restores Steering Precision & Control - Worn joints introduce slack and movement. Replacing them ensures crisp, direct response from your steering.
- Maintains Alignment Under Load - A healthy ball joint holds the wheel geometry consistent even when cornering or under load.
- Prevents Further Suspension Damage - Allowing play in a ball joint transfers forces to other components — control arms, bushings, knuckles, etc. Replacing it protects the rest of the suspension.
- Eliminates Noise & Harshness - New joints operate cleanly with no unwanted knocking or vibration.
- Safety & Reliability - Because the ball joint is a critical steering link, a failed joint can degrade or compromise safe vehicle control. Having robust, correctly functioning joints is essential.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91134104905
The product you are viewing cross references to these numbers
- 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)
This groove nut is used to secure the front lower wishbone (A-arm) ball joint on classic Porsche suspension systems. Manufactured to the exact dimensions and thread specifications of the original Porsche part, it provides reliable clamping strength and precise seating of the ball joint within the control arm.
Sold each, fits left and right
Fits:
Porsche 911 1969 - 1989
Porsche 914 1972 - 1976
Diagram ref no 17
This groove nut locks the ball joint securely into the front wishbone, maintaining correct alignment and preventing movement under cornering loads and braking forces. Its machined groove design allows for proper engagement with a locking ring or pin, ensuring long-term stability and safety.
With age, the original groove nut may corrode, lose thread integrity, or deform during removal. Using a worn or non-spec nut can lead to incorrect torque, potential loosening, or suspension play.
Replace when:
• Replacing the front ball joints or wishbone assemblies
• The threads are damaged, corroded, or rounded
• Performing a front suspension rebuild or alignment correction
Installing a fresh groove nut ensures proper torque retention, precise alignment, and dependable suspension performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90134142501
The product you are viewing cross references to these numbers
- 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)
Sold as a kit - Incl.: ball joint, hub nut, lock plate, split pin - 2 kits required per car.
Fits:
Porsche 911 08/1972-1989
Porsche 914 08/1971-02/1976
Diagram ref no 13, 15, 16 and 17
Mounting Location & Function:
• This ball joint connects the lower wishbone (control arm) to the steering knuckle at the front suspension of the car.
• It allows controlled pivoting and movement as the wheel travels over bumps and during steering, while maintaining a stable, precise alignment under loads.
Manufactured in Europe to OE specifications, this kit restores safe and precise steering by linking the control arm to the steering knuckle, allowing controlled tire movement. Over time, ball joints wear out or become damaged, leading to steering play, uneven tire wear, or knocking noises. Replacing them with OE Match parts ensures durability, reliability, and proper suspension performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91134104905
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Fits: Left or Right
Porsche 911 08/69-07/71
Porsche 914 1970-72
Price is for each.
Replace your tired ball joints to restore the original steering, worn ball joints degrade steering precision. Ball joints connect the front strut to the control arms and a failure causes loss of control. To avoid potential safety issues, street cars should replace at 100k miles, track cars more often.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1-90134104900
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 914 (1970-1976)
Price is for each.
Fits:
Fits: Left or Right
Porsche 911 08/1969-07/1971
Porsche 914 1970-1972
Diagram ref no 13, 15, 16 and 17
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90134104904
The product you are viewing cross references to these numbers
Porsche Ball Joints
At Design911, we supply performance and replacement ball joints for Porsche models, helping you restore precise steering feel and keep your suspension working as intended.
Our product range in this category
Use the filters on this page to narrow down ball joints and related hardware by Porsche model, year and position on the car.
Why do Porsche Ball Joints matter?
Ball joints are pivot points in your Porsche suspension, sitting between the control arms and the steering knuckles. They allow the wheels to move up and down with the suspension while also steering smoothly from lock to lock. Over time, the joints can wear internally or their protective boots can split, allowing dirt and moisture in. This leads to play, noise and less precise steering, and in severe cases can compromise safe suspension movement.
- Maintain accurate steering and predictable handling on your Porsche
- Help keep alignment and suspension geometry within specification
- Address knocking, looseness and other symptoms of wear before they worsen
- Support long-term safety, tyre life and overall confidence in the car
Common options & kits
Individual replacement parts
Specific ball joints or related hardware to address a particular corner or component without changing everything at once.
- Ideal for targeted repairs
- Lets you replace only what is needed
- Helps keep initial work focused on the problem area
Matched sets or pairs
Ball joints supplied as left/right or front/rear sets so both sides are renewed together.
- Consistent steering feel and suspension behaviour
- Helps avoid uneven wear or different responses side to side
- A sensible choice for routine suspension refresh work
Complete kits
Grouped parts designed to refresh a wider section of the suspension in one go, often including joints, arms and associated hardware.
- Everything specified in a single package
- Saves time compared with sourcing parts individually
- Ideal when upgrading or restoring your Porsche
Brands available in this category
For this category we stock a wide choice of trusted brands for Porsche models. You can also browse and filter by brand on this page to focus on your preferred manufacturers.
When should you review or replace your Porsche ball joints?
Checking ball joints regularly helps you spot wear, damage or age-related deterioration before it affects steering precision or leads to more extensive suspension repairs.
- Knocking, clunks or vibration from the suspension area over bumps
- Steering that feels vague, wanders or needs constant correction
- Uneven or accelerated tyre wear that points to geometry issues
- Play or roughness detected in the joint during inspection, or split dust boots letting in contamination
If any of these apply, it is a good time to review your ball joints and replace anything that is past its best so your Porsche stays dependable and reassuring to drive.
Explore Porsche ball joints with Design911
Browse ball joints for Porsche at Design911 — from individual components to complete suspension refresh kits — and find options to suit everything from routine maintenance to performance upgrades and full restoration projects.