Mercedes CLK 350 Rear Suspension Parts Guide

If you own a Mercedes-Benz CLK 350 (W209 chassis, 2005–2009), the rear suspension is a critical system that affects ride comfort, handling, and tire wear. Over time, bushings wear, shocks leak, and control arms develop play. This guide covers the essential rear suspension parts you may need to replace, common symptoms of wear, and what to look for when buying replacements.

Understanding the CLK 350 Rear Suspension Layout

The CLK 350 uses a multi-link independent rear suspension. Key components include:

• Upper and lower control arms (also called wishbones)
• Trailing arms
• Strut rods (or tie rods)
• Stabilizer bar (sway bar) and links
• Coil springs and shock absorbers (or struts, depending on the configuration)
• Rear subframe bushings
• Wheel bearings (often part of the hub assembly)

These parts work together to keep the rear wheels aligned and absorb road imperfections. On the CLK 350, the rear suspension is prone to specific wear points, especially in the control arm bushings and shock absorbers.

Common Rear Suspension Problems on the CLK 350

Worn Control Arm Bushings

The most frequent issue is worn bushings in the upper and lower control arms. Symptoms include:

• Clunking or knocking noises from the rear when going over bumps
• Vague or wandering rear end during cornering
• Uneven tire wear (especially on inner edges)

Leaking Shock Absorbers

Shock absorbers on the CLK 350 often leak after 60,000–80,000 miles. Signs include:

• Oil residue on the shock body
• Bouncy or unsettled ride
• Rear end sagging (if the shock is no longer providing damping)

Failed Sway Bar Links

Sway bar links connect the sway bar to the control arm. Worn links produce a metallic rattle or clunk over uneven pavement.

Subframe Bushing Wear

The rear subframe is mounted to the body via large rubber bushings. As they deteriorate, you may feel a thud from the rear or notice the rear axle shifting during acceleration or braking.

Choosing Replacement Parts

OEM vs. Aftermarket

Original Equipment Manufacturer (OEM) parts (e.g., Lemförder, TRW) are the same as factory parts. They offer guaranteed fit and durability but cost more.

Aftermarket brands like Meyle, MOOG, and Bilstein provide good alternatives at lower prices. Meyle HD (heavy duty) upgrades the rubber to a more durable material. MOOG parts often include improved grease fittings.

Key Considerations

• Bushing material: Rubber is OE-spec; polyurethane (Powerflex, Energy Suspension) offers longer life and sharper response but transmits more road noise.
• Shock absorbers: Bilstein B4 (OE replacement) or B6 (uprated) are popular. Monroe and Sachs also make direct replacements.
• Control arms: Many aftermarket arms come pre-loaded with bushings, saving labor. For example, a complete lower control arm with bushing installed is often a better value than pressing in a new bushing.
• Sway bar links: MOOG and Lemförder are reliable. Check if your CLK 350 has the sport suspension (often with thicker sway bar) – parts may differ.

Step-by-Step Replacement Guide (Overview)

While full instructions are beyond this guide, here is the general process for replacing rear control arms and shocks:

1. Safety first: Support the vehicle on jack stands, never just the jack.
2. Remove the wheel.
3. Disconnect the sway bar link from the control arm.
4. Remove the shock absorber lower bolt and top mounting nuts (inside the trunk or wheel well).
5. Remove the control arm bolts – note the alignment of washers and bushings.
6. Install new control arm – tighten bolts only with the suspension loaded (vehicle on the ground).
7. Install the new shock – new bolts and nuts are recommended.
8. Reconnect the sway bar link.
9. Repeat on the other side – always replace suspension parts in pairs.
10. Get a professional alignment – rear toe and camber will be affected.

Note: Always torque fasteners to factory specifications. Replace any rusty or damaged bolts.

Signs You Need a Full Rear Suspension Overhaul

If your CLK 350 has over 100,000 miles and shows multiple symptoms, consider replacing all rear control arms, shocks, and sway bar links at once. This saves labor and ensures consistent performance.

Parts List for a Complete CLK 350 Rear Suspension Kit

A typical kit might include:

• 2 rear shock absorbers
• 2 upper control arms (left and right)
• 2 lower control arms (left and right)
• 2 trailing arms (if applicable)
• 2 sway bar links
• 4 subframe bushings (optional but recommended)
• 2 stabilizer bar bushings (if worn)

Estimated cost: Aftermarket kit $400–$700; OEM kit $800–$1,200.

Final Recommendation

For most CLK 350 owners, a high-quality aftermarket kit from Meyle or MOOG paired with Bilstein B4 shocks provides the best balance of cost and longevity. If you plan to keep the car long-term, consider upgrading to polyurethane bushings for the sway bar and control arms. Always replace parts in pairs and get an alignment after any rear suspension work.

Investing in quality rear suspension parts not only restores ride comfort but also improves safety and extends tire life. Consult a qualified mechanic for installation if you're not experienced with suspension work.