Ultimate Guide to 1970 AMC Rebel Machine Suspension Parts

Restoring or upgrading a 1970 AMC Rebel Machine requires careful attention to its suspension system. Known as a performance-oriented model with a 390 V8 and handling upgrades, the Rebel Machine’s suspension components are critical for proper ride, handling, and safety. This guide covers the key suspension parts you’ll need, what to look for, and how to choose between stock replacements and modern upgrades.

Understanding the 1970 AMC Rebel Machine Suspension System

The 1970 Rebel Machine came from the factory with a front independent suspension using coil springs and control arms, and a rear leaf spring setup. The front end features upper and lower control arms, ball joints, coil springs, shock absorbers, a sway bar, and steering linkage. The rear uses semi-elliptical leaf springs, shock absorbers, and sometimes a sway bar. Performance models had heavier-duty components compared to standard Rebels.

Key Suspension Parts for the Front End

Upper and Lower Control Arms – These arms locate the front wheels and allow vertical movement. Stock arms are stamped steel. For restoration, look for OEM-style replacements. For performance, tubular arms reduce weight and improve geometry. Ensure ball joint taper and bushings match the Rebel Machine.

Ball Joints – The 1970 Rebel uses separate upper and lower ball joints. Replace only with quality units (e.g., Moog or OEM). Check if they are press-in or bolt-in; the Rebel Machine typically has press-in lower and bolt-in upper.

Coil Springs – Front coil springs support vehicle weight and affect ride height. Stock springs are rated for the 390 engine’s weight. Replacement springs should match the original rate or choose variable-rate for comfort. For lowered stance, use 1–2 inch drop springs.

Shock Absorbers – Twin-tube gas shocks like Monroe or KYB work well for daily driving. For better control, use adjustable shocks (QA1 or Viking) or performance shocks (Bilstein). The rear shocks are typically mounted separately from the springs.

Sway Bar – The Rebel Machine came with a front sway bar (7/8 inch or 1 inch). Upgrading to a thicker bar (1-1/8 inch) improves cornering. Rear sway bars were optional; adding one reduces body roll.

Steering Linkage – Includes tie rods, center link, and idler arm. The Rebel Machine uses a standard Saginaw steering box. Upgrading to a quick-ratio box or power steering conversion is common. Use high-quality tie rod ends (Moog) for precise steering.

Rear Suspension Components

Leaf Springs – The rear uses 4-leaf progressive springs. Over time they sag. Replace with OEM-style springs (from Eaton Detroit Spring or General Spring) or mono-leaf composite springs for weight reduction and better ride.

Rear Shock Absorbers – Choose shocks to match your driving style. Gas shocks like Monroe Sensa-Trac or performance shocks (Bilstein) improve damping. For lowered cars, use shocks with shortened travel.

Spring Bushings and Shackles – Polyurethane bushings reduce flex and provide consistent geometry. Replacing worn rubber with polyurethane improves handling. Shackles should be heavy-duty to resist bending under load.

Rear Sway Bar – If your car didn’t have one, adding a 3/4 inch or 7/8 inch bar with polyurethane bushings greatly reduces body roll. Hellwig and Addco make bolt-on kits.

Choosing Between OEM and Performance Parts

For a concours restoration, OEM-correct parts are essential. Look for NOS (New Old Stock) or high-quality reproductions from vendors like Kanter, OER, or Parts Geek. For a driver or pro-touring build, performance upgrades are well worth the investment.

Tubular Control Arms – Brands like QA1, Hotchkis, and UMI offer tubular upper and lower arms with adjustable cross shafts for caster/camber. They provide better clearance and weight savings.

Coilovers – Converting the front to coilovers (e.g., QA1 or Viking) allows infinite ride height adjustability and improved damping. Requires cutting off the old spring pocket and welding in a mount. Not for beginners.

Steering Box Upgrade – The stock steering box can be replaced with a faster ratio (12.7:1 vs 16:1) from Firm Feel or Borgeson. Power steering conversion kits are available for manual-steer cars.

Disc Brake Conversion – While not suspension, upgrading to front disc brakes (from a 1973+ AMC or aftermarket kit) dramatically improves stopping power and is often done with suspension work.

Common Issues and How to Address Them

• Sagging front springs – Replace with OEM-rate coils from Eaton or Moog. Do not cut springs; it ruins ride quality.
• Worn ball joints – Clunking when turning or driving over bumps. Replace both upper and lower at the same time.
• Loose steering – Check tie rod ends and center link. Replace worn parts immediately for safety.
• Rear leaf spring sag – New leaf springs restore ride height. Add a leaf or use helper springs if staying stock.
• Bushings deteriorated – Replace all rubber bushings with polyurethane for precise handling. Note: polyurethane transmits more noise and vibration.

Where to Find Suspension Parts for Your Rebel Machine

Specialty AMC vendors are your best bet. Sources like Kennedy American, AMC Connection, and Galvin’s AMC Parts stock specific suspension components. Also check Summit Racing or Jegs for performance upgrades; filter by 1970 AMC Rebel Machine. RockAuto has many OEM-grade parts at competitive prices. Always verify part compatibility using your car’s VIN or assembly date.

Final Recommendations

For a street-driven Rebel Machine, start with a complete suspension rebuild using Moog or NAPA chassis parts. Replace all bushings with polyurethane for improved feel without harshness. Upgrade the front sway bar and add a rear bar if missing. Install gas shocks from Monroe or Bilstein. If you want better handling without sacrificing comfort, consider a moderate lowering of 1-1.5 inches using quality springs. For hardcore performance, tubular lowers, adjustable shocks, and a coilover conversion will transform the car, but expect a firmer ride.

Always get an alignment after any suspension work. Use performance alignment specs (e.g., 0.5 degrees negative camber, 5-6 degrees caster) for better cornering. Maintain proper tire pressure and inspect components annually.

Your 1970 AMC Rebel Machine deserves suspension parts that match its muscle car heritage. Whether you’re restoring to showroom condition or building a corner-carver, the right combination of OEM and performance parts will keep it driving like new—or better.