Restoring or upgrading a classic Mopar vehicle often starts with the suspension. Whether you’re bringing a 1970 ‘Cuda back to factory spec or giving a 1969 Charger a modern handling edge, having the right suspension parts is critical. This guide covers the essential classic Mopar suspension components, what to look for when buying, and how to choose between original equipment and aftermarket options.
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Mopar Lowering Spring Set - P4510854
Understanding Classic Mopar Suspension Architecture
Most classic Mopars (from the 1960s and early 1970s) use a front torsion bar system with rear leaf springs. This setup is durable but can feel dated by modern standards. Key components include:
- Torsion bars – The primary front spring. They are adjustable for ride height and stiffness.
- Control arms – Upper and lower arms with ball joints and bushings.
- Steering knuckles and spindles – Attach the wheels and brakes.
- Sway bars – Reduce body roll.
- Leaf springs – Rear suspension, multi-leaf or mono-leaf.
- Shock absorbers – Dampen motion, front and rear.
- Bushings and mounts – Rubber or polyurethane.
Understanding these parts helps you identify what needs replacement or upgrade.
Key Factors When Choosing Suspension Parts
Compatibility and Year Specifics
Classic Mopar models share many parts, but there are differences. For example, 1962-1965 B-body cars have different torsion bars and control arms than 1966-1970 models. Always verify parts for your specific year and body style (A-body, B-body, E-body, etc.).
Restoration vs. Performance
Your goal determines the parts:
- Restoration – Use OEM-style or replacement parts that match factory specifications. Look for parts with correct finishes (e.g., original black phosphate or gold cadmium).
- Performance – Upgrade to tubular control arms, adjustable torsion bars, firmer bushings, and performance shocks. These improve handling and ride quality.
Material and Construction Quality
Reputable brands use heavy-gauge steel or billet aluminum. Avoid cheap parts with poor welds or thin metal. For bushings, polyurethane offers better road feel and durability than rubber, but transmits more vibration.
Front Suspension Components
Torsion Bars
Torsion bars are rated by thickness (e.g., 0.80”, 0.85”, 0.92”, etc.). Stock bars are fine for restoration; for performance, Firm Feel or Hotchkis bars increase spring rate. Adjustable torsion bars allow fine-tuning ride height.
Control Arms
- Upper Control Arms – Stock steel arms work but can flex. Tubular arms (from ADTR, Magnum Force, or Rare Parts) reduce weight and improve alignment range.
- Lower Control Arms – Usually heavy-duty. Replace bushings with polyurethane for better response.
Ball Joints and Tie Rods
Use Moog or Spicer for OEM-quality replacement. For performance, Steering & Suspension or Rebel parts offer increased durability.
Sway Bars
Add or upgrade sway bars to reduce body roll. Hellwig and Addco make direct-fit kits for classic Mopars. A 1-1/8” front bar with poly bushings is a common upgrade.
Rear Suspension Components
Leaf Springs
- Stock replacement – Eaton Detroit Spring makes exact reproductions.
- Performance – Hotchkis or Landrum offers lowered or firmer leaves. Mono-leaf or fiberglass springs save weight.
Shackles and Bushings
Replace worn shackles with Competition Engineering or Moroso units. Use polyurethane bushings for less deflection.
Shocks and Struts
- Restoration – KYB Gas-a-Just or Monroe for a stock ride.
- Performance – Bilstein, QA1, or RideTech adjustable shocks dial in damping. Coilover conversions are popular for full adjustability.
Steering and Alignment Parts
- Steering Boxes – Firm Feel offers rebuilt stock boxes with faster ratios, or go with Flaming River rack-and-pinion for modern feel.
- Pitman and Idler Arms – Replace when worn. Moog is a solid choice.
- Alignment – Aftermarket control arms provide more adjustability for camber and caster.
Bushings and Hardware
- Rubber – Original ride comfort. Buy from Dorman or Rare Parts.
- Polyurethane – Energy Suspension offers complete bushing kits for most Mopars. Expect a firmer ride.
Brand and Option Recommendations
For Restoration
- Mopar Performance – Limited but genuine OEM-style.
- USA Parts – Good fit for many A- and B-body models.
- Rare Parts – Hard-to-find brackets and hardware.
For Performance Upgrades
- Hotchkis – Complete suspension packages (coils, leafs, sway bars).
- ADTR – Tubular arms, sway bars, and bracing.
- Firm Feel – Torsion bars, boxes, and steering components.
- QA1 – Adjustable shocks and coilover systems.
Budget-Friendly
- Moog – Reliable steering and suspension parts.
- Energy Suspension – Bushings and bumpers.
- Addco – Sway bars.
Installation Considerations
- Torsion bars require proper indexing; mark orientation before removal.
- Leaf springs – Replace bolts and nuts; an alignment afterward is necessary.
- Polyurethane bushings must be lubricated with the supplied grease.
- Sway bar links should be tight but not over-torqued.
Final Recommendations
If the goal is a daily driver with improved handling, focus on:
- Upgraded sway bars (front and rear)
- Polyurethane bushings
- Good shocks (Bilstein or QA1)
- A rebuilt or performance steering box
For a rare restoration, stick with OEM-correct parts from reputable suppliers like Eaton Detroit Spring and Rare Parts. Avoid mixing stock and aftermarket components without thorough alignment.
Take your time researching part numbers and cross-referencers. Classic Mopar parts are widely available, but quality varies. Invest in the best parts you can afford—suspension directly affects safety and enjoyment.