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Porsche > 928 (1978-1995) > 928GTS 5.4L 1992-95 > Suspension & Axle > Spring Plate >

Uprated Rear Spring Plate, With G50 Gearbox. Porsche 911 1987-89
Uprated Rear Spring Plate, With G50 Gearbox. Porsche 911 1987-89 - 91133300906
Uprated Rear Spring Plate, With G50 Gearbox. Porsche 911 1987-89 - 91133300906/2, 91133300902, 91133300906 - PR08008P
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91133300906/3
Product Information
Product Information
Uprated Rear Spring Plate, With G50 Gearbox.
Upgrade your Porsche’s suspension precision with this Uprated Rear Spring Plate, designed specifically for G50 gearbox-equipped Porsche 911 models (1987–1989). This enhanced spring plate replaces the factory unit with a stronger, stiffer design that improves rear suspension control and geometry accuracy.
Sold Each.
x2 Required Per Car.

Fits:
  • Porsche 911 1987-1989 3.2L G50

Diagram Ref No 6

What This Product Does:

  • The uprated rear spring plate connects your Porsche’s torsion bar to the rear suspension arm, transferring spring tension into the chassis. It controls ride height, rear camber, and toe, and ensures the suspension geometry remains stable under load.
  • The “uprated” design improves on the original factory plate by using stronger materials and stiffer rubber bushes, reducing unwanted flex and maintaining alignment during hard cornering, acceleration, and braking.
  • For Porsche 911 models equipped with the G50 gearbox (1987–1989), this version ensures perfect fitment with the later rear suspension layout and provides a more precise, performance-focused response.

Symptoms Of A Worn Or Failing Spring Plate:
  • Uneven or Unstable Rear Ride Height – The car may sit lower on one side or show inconsistent ride height after bumps.
  • Poor Handling or “Rear-End Float” – The rear feels loose or unpredictable when cornering, braking, or accelerating.
  • Excessive Noise or Clunking – You may hear knocks or creaks from the rear suspension as the bushes wear or the plate moves.
  • Excessive Tire Wear – Incorrect geometry from worn plates can cause uneven rear tire wear, especially on the inside edge.
  • Vibration or Instability at Speed – Worn bushes can allow unwanted movement in the rear suspension, affecting high-speed stability.

Why Replacement With Uprated G50 Versions Matter:
  • Restores Geometry Precision: Keeps torsion bar alignment correct, maintaining stable camber and toe under load.
  • Improves Handling: Firmer bushings and stiffer construction minimize flex, improving cornering response and balance.
  • Eliminates Rear-End Slop: Reduces play and movement in the suspension for a tighter, more connected driving feel.
  • Enhances Durability: Modern uprated materials resist corrosion, fatigue, and aging better than the originals.
  • Essential for Restorations & Performance Builds: Ensures suspension performs at its best when upgrading shocks, torsion bars, or ride height.



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

91133300906
91133300906
91133300902
91133300906

The product you are viewing cross references to these numbers
Related products
Washer For Camber Adjuster, 12.4 x 25 x 4MM. Porsche 911 / 928 1965-95 - PCG33314302, 90133314300, 90133314302
2
Washer For Camber Adjuster, 12.4 x 25 x 4MM. Porsche 911 / 928 1965-95
Special Order item
PCG33314302
Product Information
Product Information
Washer For Camber Adjuster 12.4 x 25 x 4MM.
The Porsche Washer for Camber Adjuster is a genuine OEM component designed to ensure precise suspension alignment. Used as part of the camber adjustment assembly, this washer acts as a spacer and load distributor, helping maintain secure and accurate positioning of the suspension arms.
Sold Each.

Fits:
  • Porsche 911 1965-1968 2.0L / 912 SWB (F)
  • Porsche 911 1969-1969 2.2L / 2.4L / 2.7L RS LWB (F)
  • Porsche 928 4.5L 1978-82
  • Porsche 928S2 4.7L 1984-86
  • Porsche 928S4 5.0L 1987-92
  • Porsche 928GTS 5.4L 1992-95


What This Product Does:

  • As a washer used in a camber adjuster, its job is to act as a spacer or shim between the adjuster mechanism and adjacent components (arm, bracket, nut, etc.).
  • Helps maintain the correct alignment spacing / preload so that camber adjustment geometry is precise and held firmly.
  • Prevents metal-to-metal friction, distributes load, and ensures fasteners seat properly.

Signs / Symptoms Of Fault Or Need For Replacement:
  • Camber adjustment doesn't stay stable — alignment drifts or slips.
  • Unwanted play in suspension / control arm area near the adjuster.
  • When removing or reinstalling camber adjuster, the original washer is worn, bent, or shows damage.
  • Hard to achieve the correct alignment or shim stack due to missing or damaged spacer.

Why Replacement Matters:
  • Ensures accurate alignment — camber settings rely on precise spacing, and a worn or missing washer can ruin alignment.
  • Preserves hardware life — correct spacing reduces uneven stress or wear on adjuster bolts, bushings, or arms.
  • Maintains safety and handling — camber out of spec can lead to poor tyre contact, excessive wear, or less stable cornering.

Diagram Ref No 29



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

PCG33314302
PCG33314302
90133314300
90133314302

The product you are viewing cross references to these numbers