1964–1966 Mustang Proforged Steering & 70–73 Spindle Upgrade Kit

Performance Steering Meets Proven 70–73 Mustang Spindle Design

The 1970–1973 Mustang spindle has long been a favorite upgrade among early Mustang builders—and for good reason. Compared to factory 64–66 spindles, these feature stronger steering arms, a larger pin diameter, and more robust wheel bearings, making them far better suited for today’s wider radial tires and higher cornering loads.

Paired with high-strength Proforged steering components, this kit improves steering precision, feedback, and durability. The result is a front-end foundation that feels confident at highway speeds, more responsive in corners, and capable of handling modern performance demands.

True Bolt-On Convenience—No Guesswork Required

Anyone who has pieced together a steering and spindle swap knows the frustration of incompatible parts and endless trial-and-error. This all-inclusive kit eliminates that problem entirely.

Every component is engineered to work together seamlessly, saving time, money, and frustration during installation. Whether you’re a seasoned Mustang builder or tackling your first 64–66 upgrade, this kit delivers a straightforward, reliable install with predictable results.

Built to Last with a 1 Million Mile Warranty

Proforged steering components are designed for extreme durability and long service life. Each part is backed by Proforged’s industry-leading 1 Million Mile Warranty for added confidence on the road.

Warranty registration and full terms available at Proforged.com/Warranty.

Features & Benefits

• Complete 1964–1966 Mustang steering and spindle upgrade kit

• Includes idler arm, pitman arm, center link, inner & outer tie rod ends, sleeves, and spindles

• 1970–1973 Mustang–style spindles provide:

  • Larger wheel bearings

  • Improved steering geometry

  • 5-lug wheel conversion

  • Broad compatibility with aftermarket brake kits

• High-strength forged spindles, particle tested and E-coated for corrosion resistance and long-term durability

• Precision-engineered Proforged steering components for OE-style fit with increased strength

• Eliminates compatibility issues and simplifies installation

• Includes spindle lock nuts, castle nuts, and cotter pins for convenience

Fitment Notes

• Fits manual steering 1964–1966 Mustangs only

• Not compatible with factory power steering

• Retains or converts to 5x4.5" bolt pattern

• Aftermarket brake kits designed for 1970–1973 Mustang drum spindles are recommended

• Wheel bearings and dust seals not included