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Rear Trailing Arm

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SPF0988K
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SuperPro Trailing Arm Top Silencer Block.
Replacement for Porsche parts No. 90133105900
SET OF 4

superpro

Fits:
Porsche 911 1970-89
Porsche 912
Porsche 911 SWB

Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:

- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsive steering
- Longer service life of suspension components.

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SPF0988K
90133105900

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90133105900
Product Information
Product Information
Trailing arm top silencer block. Sold each.

porsche

Fits:
Porsche 911/912 1965-89

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90133105900
90133105900

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90133105900/1
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Trailing arm top silencer block. 4 required per car. Sold each.
A rubber-bonded bushing pressed into the upper mount of the rear trailing arm. It isolates noise/vibration and fixes the trailing arm’s pivot geometry so toe/camber stay stable under load. Porsche lists it for 1965–89 911/912 (also 912E and 930). Four are used per car. 
oematch

Fits:
Porsche 911/912/930 1965-89


Why replace them and typical age-related failures: Cracked or perished rubber → rear-end clunks, squeaks, and “rear-steer” feel on throttle/brake. Ovalised inner sleeve → unstable alignment; car wanders and tramlines. Oil/heat-swollen rubber → excess compliance and braking instability. Replacing restores correct alignment, handling and braking stability  

Common issues you’ll see Play at the trailing-arm pivot (visible with a pry bar); torn rubber. Uneven rear-tyre wear (inside edges from toe change under load). Noisy rear suspension over small bumps. Alignment won’t hold after a set-up (bushings deflect back). 

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Diagram Ref No 3



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90133105900
90133105900
90133105900HD

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About Rear Trailing Arm

Porsche Rear Trailing Arms | Design911 Suspension Components for Stability, Alignment & Handling Precision

Rear trailing arms are vital components in your Porsche’s suspension system, connecting the rear axle or hub carrier to the chassis. They control the rear wheel’s forward and backward motion while maintaining correct alignment, geometry, and stability during braking, cornering, and acceleration. Properly functioning trailing arms are key to preserving the balance, grip, and ride comfort Porsche is famous for.

At Design911, we supply a complete range of rear trailing arms, bushes, and associated components engineered for precision fitment, strength, and durability. Crafted from high-quality steel or aluminium alloys, our trailing arms provide the perfect combination of rigidity and lightweight performance. Whether for routine servicing, restoration, or track-focused upgrades, our parts restore suspension integrity and improve both comfort and control.

What Do Rear Trailing Arms Do?

Trailing arms form a structural link between the chassis and the rear wheel assembly, ensuring that the wheel remains correctly positioned and aligned through all driving conditions.

Core Functions:
• Control rear wheel movement under acceleration and braking.
• Maintain correct rear axle geometry and wheel alignment.
• Absorb road shocks to improve comfort and stability.
• Enhance traction, grip, and straight-line performance.
• Support suspension articulation and chassis balance.

High-quality rear trailing arms keep your Porsche’s suspension geometry stable — ensuring predictable, precise handling on both road and track.

Why Do Rear Trailing Arms Fail or Degrade?

Trailing arms operate under constant load and movement, making them vulnerable to wear, corrosion, and metal fatigue over time.

Common Causes of Failure Include:
• Worn or cracked bushings leading to excess play.
• Corrosion or rust weakening the arm structure.
• Impact damage from road debris or kerb strikes.
• Metal fatigue from repeated high-load driving.
• Loose or damaged mounting bolts affecting alignment.

When trailing arms fail, symptoms include clunking noises, unstable handling, uneven tyre wear, and poor rear-wheel alignment — making timely replacement essential for performance and safety.

Why Replace or Upgrade Your Porsche Rear Trailing Arms?

Replacing worn or damaged trailing arms restores suspension geometry, stability, and control. Upgraded performance arms enhance chassis stiffness, adjustability, and precision — ideal for spirited driving or motorsport use.

Key Benefits:
• Restores suspension alignment and stability.
• Improves handling precision and cornering balance.
• Eliminates vibration, noise, and excess rear-wheel play.
• Constructed from corrosion-resistant, high-strength materials.
• Fits Porsche 911, 944, 968, Boxster, Cayman, Cayenne, and Macan models.
• Ideal for servicing, performance upgrades, or full restorations.

Design911’s Porsche rear trailing arms deliver exceptional engineering, ensuring your Porsche drives with the strength, precision, and control it was designed for.

Highlights

• Premium Porsche rear trailing arms and mounting components.
• Precision-engineered for suspension accuracy and strength.
• Restores handling, alignment, and ride comfort.
• Available in standard or performance-grade materials.
• Suitable for both classic and modern Porsche models.
• Perfect for restoration, servicing, or track preparation.

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