2001 Mitsubishi Eclipse Rear Suspension Parts Diagram

If you own a 2001 Mitsubishi Eclipse and are planning to service or upgrade the rear suspension, a clear understanding of the parts diagram is essential. The rear suspension of this third-generation Eclipse (2000–2005) is a fully independent multi-link setup, which provides a good balance of ride comfort and handling. This article breaks down the diagram, explains each major component, and offers practical guidance for maintenance and repairs.

Overview of the 2001 Eclipse Rear Suspension System

The 2001 Mitsubishi Eclipse uses a multi-link independent rear suspension. Unlike older solid-axle designs, multi-link systems allow each wheel to move independently, improving traction and ride quality. The rear suspension consists of several arms, a knuckle, coil-over strut units, and a stabilizer bar. All Eclipse models from 2001 are front-wheel drive (FWD), so the rear suspension does not drive the wheels. The design is common across trims: RS, GS, GT, and GTS.

Key Components of the Rear Suspension

Below are the main parts you’ll see on a typical diagram.

Upper Control Arm

The upper control arm connects the top of the knuckle to the subframe. It pivots on bushings at both ends and helps control camber and caster angles. Over time, the bushings can crack or wear out, leading to alignment issues and clunking noises. When replacing, use OEM or high-quality aftermarket arms to preserve geometry.

Lower Control Arm (A-arm)

The lower control arm attaches the bottom of the knuckle to the subframe. It is a robust stamped steel or aluminum piece depending on the model. This arm absorbs most of the lateral and longitudinal forces. Worn ball joints or bushings here cause loose steering and uneven tire wear.

Knuckle / Spindle

The knuckle is the central hub that connects the other arms, the strut, and the wheel bearing. It rotates as the wheel turns and provides the mounting point for the brake caliper. The knuckle itself rarely fails, but the attached wheel bearing is a common wear item.

Coil Spring and Strut Assembly

The 2001 Eclipse uses a coil-over strut design: the spring is mounted around the shock absorber. This assembly supports the vehicle weight and dampens road impacts. Leaking fluid from the strut or a sagging spring indicate replacement is needed. Many aftermarket options offer improved handling, but match spring rates to your driving needs.

Stabilizer Bar (Sway Bar) and Links

The stabilizer bar (also called anti-roll bar) connects the left and right sides of the suspension to reduce body roll during cornering. It attaches to the knuckle via small links with ball joints. Worn links create a metallic clunk over bumps and increase body lean. These are inexpensive and easy to replace.

Trailing Arms

Though not always labeled, the Eclipse rear suspension includes trailing arms that control front-to-rear wheel movement. These arms are often integrated into the lower control arm assembly. Check for bent or rusted trailing arms if the vehicle has been in an accident or driven in salt.

Wheel Bearings and Hubs

The wheel bearing is pressed into the knuckle and allows the wheel to spin freely. A failing bearing makes a humming or grinding noise that changes with speed. The hub assembly includes the wheel studs and sometimes the bearing as a unit. Replace the entire hub/bearing assembly if worn.

Understanding the Rear Suspension Diagram

A typical diagram shows the suspension from a top view and a side view. The top view reveals the layout of the control arms, sway bar, and subframe. The side view shows how the strut and spring connect to the knuckle. Labels often use abbreviations: UCA (upper control arm), LCA (lower control arm), SB (stabilizer bar), and RS (rear strut). Parts are numbered for cross-referencing with a manual.

When reading the diagram, note the orientation: the front of the car is usually at the top of the page. The subframe is shown as a dark outline, and the arms extend outward to the knuckle. The sway bar runs transversely across the subframe, with links dropping down to the knuckles.

Common Issues with the 2001 Eclipse Rear Suspension

Owners report several recurring problems:

• Worn control arm bushings: Causes vague handling and alignment drift. Check for cracked or deformed rubber.
• Leaking struts: Oil residue on the strut body indicates seal failure. The ride becomes bouncy.
• Broken sway bar links: A clunk from the rear over bumps is the classic symptom. Links are often replaced in pairs.
• Sagging coil springs: The rear of the car sits lower, and the ride may bottom out. Springs can break or lose tension.
• Wheel bearing failure: Listen for a growl that changes with speed. If severe, the wheel may have excessive play.

Inspect these parts regularly, especially if you hear unusual noises or notice uneven tire wear.

How to Use the Diagram for DIY Repairs

1. Identify the part you need: Use the diagram and your vehicle’s service manual to find the correct part number. Many online parts stores let you search by diagram.
2. Safely lift the vehicle: Always use jack stands. The rear suspension should be unloaded for most repairs, but some procedures (like tightening bolts) require the suspension to be compressed.
3. Follow torque specifications: Critical bolts like those on the lower control arm and knuckle must be torqued to factory specs—typically 70–100 ft-lbs for large bolts. Overtightening can damage bushings.
4. Replace in pairs: For springs, struts, and control arms, replace both sides to maintain balance. Sway bar links can be done individually, but matching new links is recommended.
5. Get an alignment: Any time you replace a component that affects the knuckle’s position (control arms, struts), a professional wheel alignment is necessary to prevent tire wear and handling issues.

Final Recommendations

For the 2001 Mitsubishi Eclipse rear suspension, use OEM or premium aftermarket parts from reputable brands like Moog, KYB, or Monroe. Avoid cheap no-name parts that wear out quickly. When following the diagram, double-check that you have the correct parts for your specific trim—RS and GT may have different spring rates. If you’re unsure, consult a factory service manual or an experienced mechanic. Replacing worn suspension components will restore ride quality, improve safety, and keep your Eclipse handling like new.