Xtreme-Grip™ Vintage Rear Suspension System 64 -70 Mustang and Cougar


SKU:  RSS-10-1000-00


The CorteX Xtreme-Grip Vintage Rear Suspension System for the 64-70 Mustang and Cougar delivers modern geometry, improved chassis strength and cornering grip with minimal modification.

* RSS-10-1000 requires a customer supplied 9 inch rear end or option 8.8*.


Suspension Upgrades:

  • Watts link
  • Torque arm
  • Reduction of unsprung weight and friction
  • Rear grip exponentially improved
  • Increase power off of corners.
  • Nose dive under braking nearly eliminated
  • Improved center of gravity


If you’ve never driven a professionally engineered watts link and torque arm suspension set-up, be prepared for a revelation.  You won’t be going back to anything else!


Coilover Options * 

Rear End Options

Must be Moser M88, FOX, SN95, or S197. Will not work on Explorer or Crown Victoria 8.8


Xtreme-Grip™ Vintage Rear Suspension System


Vehicles: Ford Mustang (64, 65, 66, 67, 68, 69, 70) and Mercury Cougar (67, 68, 69, 70)

CorteX delivers a complete redesign of the original suspension system and utilizes modern geometry that is suited for today’s performance tires.


  • Xtreme-Grip Vintage Watts link System
  • Xtreme-Grip Vintage Torque arm
  • Sub Frame Connectors
  • Rear Lower Control Arms
  • Bracketry for Watts link and Torque arm to Weld onto Customer Supplies 9 inch Rearend Housing
  • See options for use on 8.8 rear end (Must be Moser M88, FOX, SN95, or S197. Will not work on Explorer or Crown Victoria 8.8)
  • All necessary hardware

Note: See other Xtreme-Grip Vintage kit configurations for options of full floater rear end housing and/or axles.

Coilover sold separately. See options below.

Optimized Geometry, Lighter Weight

Particular consideration was given to packaging, weight, and suspension geometry for the vintage mustang platform.  The leaf springs suspension was discarded in favor of a watts link, torque arm, and Coilover package which does everything better than the original suspension.  When driving the car you can feel the reduction of unsprung weight and friction.

Cornering Grip

Rear grip is improved exponentially and power is put down effortlessly both in a straight line and coming off of corners.  The torque arm serves double duty and also virtually eliminates nose-dive under braking.  Instead the entire chassis squats as the deceleration loads push the entire car into the pavement at its center of gravity. If you’ve never driven a car with well-designed watts link/torque arm combination be prepared for a revelation.  You won’t be going back to anything else!

Increased Chassis Strength and Stiffness

Vintage Mustangs have lightweight flimsy unibody chassis that can compromise handling.

We engineered our suspension to increase chassis strength and stiffness for a superior response.  The geometry optimizes the roll center height, lateral roll center migration, and minimizes bumpsteer all the while allowing the build to adjust ride height as much as 2.5 inches to achieve the optimal stance both at the track and on the street.

The CorteX Xtreme-Grip Vintage Suspension System is designed to install with minimal permanent modifications to your pony.   Other suspension systems require the car to be completely cut up for the installation and actually make the vehicle even flimsier than it was from the factory while adding additional weight in the process.

Ease of Installation

To install our vintage rear system the only permanent modifications required are the installation of our weld-in subframe connectors and a simple modification to the rear trunk sheet metal just ahead of the gas tank to gain adequate for the watts link and coil-overs.  All modifications can be reversed at a later time if desired.

Pro-Tip: CorteX recommends that this Vintage Rear Suspension System be installed concurrently with the Xtreme-Grip Vintage Front Suspension System.

(1964, 1965, 1966, 1967, 1968, 1969, 1970)

Additional information

Weight 150 lbs
Dimensions 48 × 40 × 24 in


There are no reviews yet.

Be the first to review “Xtreme-Grip™ Vintage Rear Suspension System 64 -70 Mustang and Cougar”

You may also like…