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64-70 Mustang Heidts Independent Rear Suspension Kit, Outboard Brakes

IRC-850

Independent Rear Suspension (IRS) Upgrade for Classic 65-70 Mustang

Transform your classic 65, 66, 67, 68, 69, or 70 Mustang's ride and handling with a precision-engineered Independent Rear Suspension (IRS) system from Heidts. Designed specifically for 1964½–1970 Mustangs, this modern suspension upgrade replaces the traditional solid rear axle with a fully independent setup—bringing 21st-century performance to America’s favorite pony car without compromising its vintage exterior looks and character. Get Sharper Cornering and more predictable handling dynamics along with reduced body roll, enhanced ride comfort on uneven pavement, and better grip and stability in spirited driving and daily cruising!

Whether you're carving canyon roads or just want a smoother, more composed ride, an IRS system breathes new life into your classic Mustang—making it not just look like a legend but drive like one too!

Sold as KIT

Shipping: Limited Time Offer - FREE Shipping via Ground within 48 Contiguous States!
Pricing: $9,923.00

Customize Your Item

- Select Your 3rd Member Assembly -
 * required
- Add Rear Sway Bar Kit -
 * required
- Select Your Rear Brake Kit -
 * required
Qty:
FREE SHIPPING on orders *$199 or more

Special Notes

Key Product Features & Benefits:

  • Precision-Engineered Control Arms: Tubular upper and lower control arms ensure predictable handling and accurate alignment.
  • Adjustable Coil-Over Shocks: Customize ride height and dial in damping/rebound to your exact driving style.
  • Superior Suspension Geometry: Vastly improved over stock for enhanced traction and alignment stability.
  • Outboard Brake Design: Supports larger diameter rotors and caliper combinations for improved braking performance.
  • High-Horsepower CV Shaft Kits: Efficiently transfer power to the pavement, reducing drivetrain loss and improving response.
  • Flexible Drivetrain Compatibility: Designed to integrate with stock or upgraded drivetrains.
  • Easy Installation: Mounts to stock rear frame rails with minimal welding and trunk floor modification.
  • Fuel Tank Compatibility: Works with the original stock fuel tank.

 Benefits to Handling & Driving Experience

Upgrading to an Independent Rear Suspension (IRS) dramatically enhances your classic Mustang’s agility, ride comfort, and road manners. Compared to a stock live axle, IRS allows each wheel to react independently for optimal performance.

  • Sharper cornering and more predictable handling dynamics.
  • Reduced body roll (especially with optional rear sway bar kit) and minimized wheel hop during hard launches.
  • Improved ride comfort on rough or uneven roads.
  • Superior traction and stability during both spirited and daily driving.

 Important Installation Notes: 

  • Exhaust Routing: The stock exhaust must be custom routed to the rear or exit at the sides before the rear tires.
  • Chassis Reinforcement: For high-horsepower applications, subframe connectors are strongly recommended to support and stiffen the unibody.
  • Brake Compatibility: Factory disc brakes from 8” or 9” rear axles are not compatible with this custom IRS setup.
  • Install Instructions PDF: See "Documents" Tab Above to download the Instructions PDF

Details

Shipping Information

  • Item Requires Shipping
  • 150.0 lbs.
  • W32.0000” x H32.0000” x L58.0000”
  • FREE SHIPPING on orders *$199 or more
  • This item ships in its own box.
  • Limited Time Offer - FREE Shipping via Ground within 48 Contiguous States!

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