Are Triumph and Healey Front Suspension Parts the Same?

If you own or work on British sports cars from the 1950s and 1960s, you have likely wondered whether front suspension parts from Triumph and Austin-Healey are the same. While both marques share a similar era and engineering philosophy, their front suspension designs differ significantly. This article explains the key differences, what parts might be interchangeable, and what to watch out for during restoration or upgrades.

The Two Legends: Triumph and Healey

Triumph produced models like the TR2, TR3, TR4, TR6, Spitfire, and GT6. Austin-Healey offered the 100, 3000, and Sprite (which later became the MG Midget). Both cars use independent front suspension, but the geometry, components, and mounting points are not identical.

Front Suspension Design Differences

Triumph Front Suspension

Most Triumph models from the TR2 to TR6 use a double-wishbone setup with coil springs and lever-arm shock absorbers. The upper wishbone pivots on a kingpin pin, while the lower wishbone is anchored to the chassis. The steering link is through a rack-and-pinion system on later models (TR4 onward) or a worm-and-sector box on earlier ones. The suspension uses trunnions (threaded pivots) that require regular greasing. Spitfires and GT6s have a simpler double-wishbone setup with a single lower arm and a transverse leaf spring on some variants.

Austin-Healey Front Suspension

The Austin-Healey 100 and 3000 use a similar double-wishbone layout but with a few key differences. The upper wishbone is shorter on Healeys, giving different camber and caster angles. The shock absorbers are lever-arm type but have different bolt patterns and arm lengths. Healeys also use a kingpin and trunnion design, but the thread pitch and dimensions differ from Triumph. The steering gear is a worm-and-sector unit that is unique to Healey. The Sprite uses a different system based on the Morris Minor, with a single lower wishbone and a torsion bar.

Are Any Parts Interchangeable?

Bushings and Bearings

While both cars use rubber or polyurethane bushings, the sizes and shapes vary. Some aftermarket companies offer universal poly bushings that can be trimmed to fit, but you cannot directly swap a Triumph lower wishbone bushing into a Healey. The same goes for ball joints: Triumph lower ball joints have a different taper and thread size than Healey units.

Steering Components

Tie rod ends may look similar but have different thread sizes and taper angles. The steering rack (for later Triumphs) is completely different from the Healey's steering box. There is no direct cross-compatibility.

Shock Absorbers

Lever-arm shocks appear similar but have different operating arms and mounting hole spacing. You cannot put a Triumph shock on a Healey without modification. However, some modern telescopic conversion kits are made for specific models and may share a common shock absorber (e.g., Monroe or Spax units) – but the brackets and hardware will be car-specific.

Springs and Sway Bars

Coil spring free length, rate, and diameter differ. Triumph springs are often stiffer and shorter. Sway bars have different diameters and mount points. Do not mix them.

Custom and Aftermarket Options

Several aftermarket suppliers (e.g., Moss Motors, British Parts Northwest) offer upgraded suspension components for both marques. While a few generic items like tie rod adjusters might share threading, it is risky to assume. Always check part numbers and consult the supplier.

Practical Considerations for Restoration or Upgrade

Sourcing Correct Parts

Use model-specific parts catalogs. Many parts are still reproduced but are not interchangeable between Triumph and Healey. When rebuilding, replace all bushings, ball joints, trunnions, and kingpins with the correct parts for your car.

Performance Upgrades vs. Originality

If you want stiffer handling, look for springs and sway bars designed for your specific model. Some companies sell “stage 2” or “fast road” kits that include matched springs, shocks, and bushings. These are far more reliable than attempting a cross-breed setup.

Common Mistakes to Avoid

• Assuming that because both cars are British, the parts are the same.
• Using Healey kingpins in a Triumph hub (they have different spline counts).
• Trying to install a Triumph steering rack into a Healey (completely different chassis geometry).

Final Recommendation: Don't Assume Compatibility

Front suspension parts from Triumph and Healey are not interchangeable in any direct bolt-on sense. While both marques share a basic independent suspension concept, the specific dimensions, mounting points, and geometries are unique. Attempting to mix parts can lead to poor handling, uneven tire wear, and safety issues. Always consult a reputable parts supplier or a specialist before purchasing. For restoration, stick with model-specific parts. For upgrades, look for kits designed for your exact car. Your Healey will thank you with proper cornering, and your Triumph will reward you with predictable road manners.