The AMC Spirit, produced from 1979 to 1983, is a compact car that has earned a loyal following among classic car enthusiasts. Over time, suspension components wear out, leading to poor ride quality, handling issues, and safety concerns. Replacing or upgrading suspension parts is a common task for owners who want to restore or improve their Spirit. This guide covers the key suspension parts you’ll need, compatibility with other AMC models, and practical tips for sourcing and installing components.
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Overview of the AMC Spirit Suspension System
The AMC Spirit uses a traditional suspension design with independent front suspension and a solid rear axle. Understanding the basic layout helps you identify the parts you need.
Front Suspension Components
The front suspension of the Spirit features unequal-length control arms (upper and lower), coil springs mounted on the lower control arm, tubular shock absorbers, and a stabilizer bar (sway bar). Steering knuckles and ball joints connect the control arms to the wheel hubs. Rubber bushings isolate the control arms from the frame, but these wear out and cause looseness.
Rear Suspension Components
The rear suspension is a solid axle with leaf springs, shock absorbers, and sometimes a stabilizer bar. The leaf springs are multi-leaf and attached to the axle via U-bolts and to the frame through spring shackles and bushings. Rear shocks are typically mounted between the axle and the frame. Some Spirit models may have an optional rear sway bar.
Common Suspension Issues in the AMC Spirit
Age and mileage take a toll on the Spirit’s suspension. Typical problems include:
- Sagging or broken coil and leaf springs
- Leaking or worn-out shock absorbers
- Cracked or deteriorated rubber bushings (control arm, spring, sway bar)
- Loose or worn ball joints and tie rod ends
- Bent or rusted sway bar links
- Noisy or clunking suspension over bumps
Addressing these issues promptly prevents further damage and restores driving comfort and safety.
Types of Replacement Suspension Parts
When restoring or upgrading your Spirit’s suspension, you have several options for each component.
Shocks and Struts
The front uses separate shock absorbers, not struts. Rear shocks are also separate. Replacement shocks are available in standard OEM-style or gas-charged designs for improved damping. For a stock ride, choose OEM equivalents. For better handling, consider performance shocks from brands like KYB, Monroe, or Bilstein, but ensure they fit the Spirit’s mounting points.
Coil Springs and Leaf Springs
Front coil springs are typically rated by wire diameter and free height. Worn springs can sag, so replace them in pairs. Aftermarket coils may offer a slight lift or lower stance. Rear leaf springs are available as complete assemblies or individual leaves. New leaf springs restore ride height and load capacity. If you carry heavy loads, consider heavy-duty leaf springs.
Control Arms and Bushings
Upper and lower control arms can be replaced as complete units or just the bushings. Polyurethane bushings are a popular upgrade because they are more durable and improve steering response. However, they transmit more road noise. Rubber bushings provide a quieter ride and are fine for restoration. Control arms may also include ball joints; some aftermarket arms come pre-assembled.
Sway Bars and End Links
A front sway bar reduces body roll. The stock bar can be upgraded to a thicker diameter aftermarket bar for better cornering. Sway bar end links and bushings also wear out. Replacing them with polyurethane versions tightens the bar’s action.
Compatibility and Interchangeability
The AMC Spirit shares its platform with the AMC Concord and the Jeep CJ? Actually, the Spirit uses a modified version of the AMC Hornet platform. Many suspension parts are interchangeable with the 1978-1983 AMC Concord and Eagle models. Specifically, front control arms, coil springs, and shocks may swap, but always verify part numbers. Rear leaf springs and shocks also interchange with Concord and Eagle sedans/wagons. The Jeep CJ uses different components, so avoid those. Always cross-reference parts using a reputable supplier’s catalog or enthusiast forums.
Choosing the Right Material and Quality
For a daily driver or restoration, OEM-style parts from brands like Moog, TRW, and AC Delco (though AC Delco is GM-focused, some parts fit) provide reliable longevity. For performance or lowered vehicles, choose components from companies that specialize in AMC parts, such as BJ’s Off-Road or Sunman Engineering. Polyurethane bushings are great for handling but require periodic lubrication. Avoid cheap no-name parts that may fail prematurely. Stick to reputable brands recommended by AMC clubs.
Where to Find AMC Spirit Suspension Parts
Because the Spirit is no longer in production, parts are not at every retailer. Check:
- Specialized AMC parts suppliers (online and catalog)
- Classic car salvage yards that have AMC vehicles
- Enthusiast clubs and forums with classifieds
- National auto parts chains that still carry some chassis parts for older vehicles (though stock is limited) Always call ahead to confirm availability. When buying used parts, inspect carefully for rust and wear.
Installation Considerations
Replacing suspension components requires basic mechanical skills, proper tools (spring compressor, ball joint press, torque wrench), and safety precautions. Work on a level surface and support the vehicle securely on jack stands. After installation, a professional wheel alignment is necessary. If you are not comfortable, hire a mechanic experienced with classic cars. Many suspension parts are heavy; use caution.
Final Recommendations
For a standard restoration, replace all wear items at once: shocks, springs, bushings, ball joints, and tie rod ends. Use rubber bushings for a quiet ride and OEM-grade shocks. If you want improved handling without sacrificing comfort, upgrade to a set of gas shocks and polyurethane sway bar bushings. For lowered or performance builds, consider aftermarket coil springs and adjustable shocks, but confirm spring rates to avoid a harsh ride. Always prioritize safety: inspect steering components and brake lines while you’re under the car. With careful selection and proper installation, your AMC Spirit will drive like new and remain reliable for years.