If you own a 2004 Mitsubishi Eclipse, the suspension system is a key component that affects ride comfort, handling, and safety. Over time, parts wear out and need replacement. This guide covers the most common suspension parts for the 04 Eclipse, what to look for when buying, and how to make smart choices for your car.
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Understanding the 2004 Eclipse Suspension System
The 2004 Eclipse came in several trims (RS, GS, GT, and GTS) with slightly different suspension setups. The front uses a MacPherson strut design, while the rear features a multi-link arrangement. Key components include struts, springs, control arms, ball joints, tie rods, and bushings. Replacing worn parts restores ride quality and prevents uneven tire wear.
Common 2004 Eclipse Suspension Issues
Owners often report symptoms like clunking noises over bumps, excessive body roll, or a bouncy ride. The original struts and shocks tend to lose damping after 80,000–100,000 miles. Control arm bushings crack and cause vague steering. Ball joints can wear out and create steering play. Recognizing these signs early helps you plan repairs.
Worn Struts and Shocks
Struts on the front and shocks on the rear control wheel motion. When they fail, the car may bottom out on dips or feel unstable on freeways. Replacement is the only solution. Choose between standard replacements (OE-style) or performance upgrades like KYB or Monroe.
Deteriorated Bushings
Rubber bushings in lower control arms and trailing arms dry out and crack. This leads to clunks and misalignment. Polyurethane bushings are a popular upgrade for longer life and better handling, but they transmit more road noise.
Failing Ball Joints and Tie Rods
Ball joints connect the steering knuckle to the control arm. A loose ball joint can cause wandering steering. Inner and outer tie rods connect the steering rack to the wheels; worn ones cause play. Both should be inspected when replacing suspension components.
Key Suspension Parts for 2004 Eclipse
When shopping for parts, focus on these main categories:
Front Strut Assemblies
A complete strut assembly includes the strut, spring, spring mount, and boot. It simplifies installation because you don't need a spring compressor. Brand options: Monroe Quick-Strut, KYB Strut-Plus, or AC Delco. For sportier driving, consider adjustable coilovers.
Rear Shocks and Springs
The rear uses separate shock absorbers and coil springs. Replace shocks in pairs. OEM-style shocks from KYB (Excel-G) or Monroe (Gas-Magnum) are good choices. If you want to lower the car, choose matched lowering springs like Eibach or H&R with suitable shocks.
Control Arms and Bushings
Front lower control arms often come with ball joints and bushings pre-installed. Aftermarket arms from Moog, Mevotech, or Duralast are solid picks. Rear trailing arms and later arms also have bushings that can be replaced separately or as an assembly.
Sway Bar Links
These connect the sway bar to the control arm. Worn links cause knocking over speed bumps. Replace with Moog or OEM links. Upgraded aftermarket links with grease fittings last longer.
How to Choose the Right Parts
Selection depends on your budget and driving style.
OEM vs Aftermarket
Direct OE replacements from the dealer are expensive. Quality aftermarket parts from Moog, KYB, or Monroe offer good durability at lower prices. Avoid no-name brands that may fail quickly.
Standard vs Performance
If you daily drive and want comfort, stick with standard parts. For autocross or spirited driving, performance struts (e.g., KYB AGX adjustable) and springs (e.g., Eibach Pro-Kit) improve handling with a modest ride trade-off.
Complete Assemblies vs Components
Complete strut assemblies save time but cost more. If you have the tools and skills, buying individual struts and springs is cheaper. For DIYers, complete assemblies reduce risk of installation errors.
Installation Tips
Replacing suspension parts requires proper jack stands, a torque wrench, and penetrating oil for rusty bolts. Always get a wheel alignment after replacing any steering or suspension component. If you're not experienced, consider a professional mechanic.
Safety First
Use jack stands – never rely on a jack alone. Disconnect the battery when working near airbag sensors. Wear safety glasses when compressing springs.
Recommended Tools
Basic tools: socket set, wrenches, breaker bar, ball joint separator, spring compressor (if not using assemblies), and a torque wrench for lug nuts and suspension bolts.
Final Recommendation
For most 2004 Eclipse owners, the best approach is to replace worn components with quality aftermarket parts. For front struts: KYB Strut-Plus assemblies are a reliable all-in-one solution. For rear shocks: KYB Excel-G gas shocks provide a balanced ride. Pair with Moog sway bar links and control arms for longevity. If you want sharper handling without sacrificing daily comfort, choose KYB AGX adjustable struts and Eibach Pro-Kit springs. Stay away from ultra-cheap parts; focus on brands with known quality. Finish with a professional alignment to protect your tires and ensure safe driving. With the right suspension parts, your 2004 Eclipse will feel like new again.