Porsche 944 Turbo Rear Suspension Parts: A Complete Guide

The Porsche 944 Turbo (951) is known for its balanced handling, thanks in large part to its sophisticated rear suspension. Unlike the front strut setup, the rear uses a semi-trailing arm design with torsion bars, offering a unique blend of compliance and control. Over time, these components wear out or can be upgraded for better performance. This guide covers the essential rear suspension parts for the 944 Turbo, common issues, and what to consider when replacing or upgrading.

Understanding the 944 Turbo Rear Suspension Layout

The 944 Turbo rear suspension is a semi-trailing arm system, which is essentially a multi-link design. Each rear wheel is attached to an aluminum trailing arm that pivots on bushings. The trailing arm is connected to the chassis via a lateral link (also called a toe link or track rod). Springing is provided by torsion bars that run transversely inside the rear crossmember, while double-acting gas shocks control damping. This setup gives a low unsprung weight but requires careful alignment and maintenance.

Key Components

The major parts include:

• Trailing arms (aluminum)
• Rear torsion bars ( adjustable for ride height)
• Rear shocks (gas filled, often with threaded bodies for coilovers)
• Trailing arm bushings (rubber or polyurethane)
• Lateral links (toe links) and their bushings
• Sway bar (optional on some models, but common on Turbo)
• Hub carriers and wheel bearings
• Parking brake mechanisms

Common Wear Items and Symptoms

Owners typically need to address these parts as the car ages:

1. Trailing Arm Bushings

The rubber bushings where the trailing arm mounts to the chassis degrade over 30+ years. Symptoms include vague rear end feel, clunking when going over bumps, and excessive rear toe change under load. When these bushings fail, alignment numbers can shift unpredictably.

2. Torsion Bars

Torsion bars rarely break, but the adjusting mechanism (eccentric bolts) can seize. Also, factory bars may sag over time, causing uneven ride height. Upgrading to stiffer bars or switching to coilover springs is common for track use.

3. Shocks

Original shocks lose damping after 50k-80k miles. A worn shock leads to bounce, poor tire contact, and reduced cornering grip. Many owners replace with Bilstein or Koni, or convert to coilovers.

4. Lateral Links (Toe Links)

The toe link bushings (both inner and outer) wear out, causing vague steering and wandering. Adjustable links allow precise alignment for lowered cars.

5. Parking Brake Hardware

The internal drum parking brake parts (shoes, springs, cables) often seize from disuse. This can cause dragging or noise.

Replacement vs Upgrade Considerations

For a daily driver, choose high-quality OEM replacements or improved rubber bushings (like 944 Racing or Lindsey Racing) for longevity. Polyurethane bushings (powerflex) offer more precise feel but can transmit more noise and vibration. For track or autocross, consider:

• Adjustable torsion bars or coilover conversion (e.g., KW, Ground Control)
• Monoball trailing arm bushings (eliminates compliance)
• Adjustable lateral links (to dial in alignment)
• Sway bar upgrade (larger diameter, adjustable)

Popular Aftermarket Brands

Here are reliable suppliers for 944 Turbo rear suspension parts:

• Pelican Parts: OEM quality replacement bushings, shocks, and hardware.
• Lindsey Racing: Performance bushings, torsion bars, and coilover kits.
• Rennbay: Bolt-in adjustable links and polyurethane bushings.
• Paragon Products: Rebuild kits, bearings, and hardware.
• Bilstein / Koni: For replacement shocks (B6/B8 for lowered cars).

Step-by-Step Considerations for Replacement

Replacing rear suspension parts on a 944 Turbo requires careful procedure due to torsion bar preload. Here are basic guidelines:

1. Safety first: Support the car on jack stands. The torsion bars are under load.
2. Remove wheels and brakes: Access to trailing arm bolts.
3. Support the trailing arm: Unbolt shock and disconnect lateral link.
4. Remove torsion bar: Note the preload setting (count splines) if reusing. For new bars, install and adjust ride height via eccentric bolts.
5. Replace bushings: Press out old rubber, press in new (poly may need lubrication).
6. Reassemble: Torque bolts while suspension is at normal ride height (car on ground).
7. Align: After any suspension work, a professional alignment is critical. The 944 is sensitive to rear toe and camber.

If you are unfamiliar with torsion bars, consider having a specialist shop do the job. Improper torsion bar adjustment can affect ride height and handling.

Cost Overview

Prices vary widely:

• Trailing arm bushings (set): $50-150 for rubber, $80-200 for polyurethane.
• Replacement shocks (pair): $200-500 for Bilstein/Koni.
• Coilover conversion (complete): $800-2000+.
• Torsion bars (pair): $300-600 for aftermarket.
• Lateral links (adjustable pair): $150-400.

Common Mistakes to Avoid

• Mixing spring rates: If you upgrade torsion bars, ensure shocks are valved accordingly.
• Neglecting alignment: Even new factory parts can cause poor handling if toe is off.
• Over-tightening bushings: Rubber bushings need to be tightened at ride height to avoid binding.
• Ignoring parking brake: A stuck brake can cause heat buildup and damage bearing.

Final Recommendation

For most 944 Turbo owners, start with new OEM-style trailing arm bushings and fresh shocks (Bilstein B6). This restores original handling without harshness. If you track the car, go to polyurethane bushings and adjustable lateral links for better control. For serious performance, consider a coilover conversion that eliminates torsion bars. Whichever route you take, always prioritize a quality alignment after installation.

Maintaining the rear suspension on a 944 Turbo is key to preserving its legendary handling. Whether you are refreshing a daily driver or building a track car, understanding your options will help you make smart, lasting choices.