CorteX 1964-1970 Mustang & Cougar Xtreme-Grip Complete Rear Suspension System & M88 Axle Combo


6,395.00 6395.0 USD 6,395.00


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How to Buy

Due to the technical nature of this product, it is highly recommended that you call us to order.

Step 1. Choose your rear end, either with a new Moser M88 housing included in this package, or with a premium 9" axle housing (sold here)

Step 2. Choose your rear shocks. You can browse available rear shocks here.

Step 3. Choose your brakes. You can browse available rear brake systems here.


Xtreme-Grip™ Vintage Rear Suspension System, with Moser M88 Rearend Housing

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

  • Ideal for modern performance tires
  • Optimize stance, adjust ride height as much as 2.5 inches lower
  • Corrects the roll center height, lateral roll center migration
  • Minimizes bumpsteer
  • Adjustable for track or street use

A complete redesign utilizing modern geometry

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.

Feel the reduction of unsprung weight and friction.

Rear grip is exponentially improved 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 a well-designed watts link/ torque arm combination be prepared for a revelation. You won’t go back to anything else!

Easy install with minimal alteration to your Mustang

The CorteX Xtreme-Grip Vintage Suspension System is designed to install with minimal permanent modifications to your pony.

To install, the only permanent modifications required are the weld-in subframe connectors and a simple modification to the rear trunk sheet metal just ahead of the gas tank to gain adequate clearance for the watts link and coil-overs.  Rest assured, all modifications for a CorteX build can be reversed at a later time if desired.

A Vintage Mustang has a lightweight flimsy unibody chassis that can compromise handling; as a result, when other suspensions systems require the car to be completely cut up during installation… but, this actually makes the vehicle even flimsier than factory original while adding additional weight in the process.

Increase chassis strength and stiffness

The engineers at CorteX designed the Watts Link System to optimize superior responsiveness and durability using professional engineering and testing methods.

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


  • Xtreme-Grip Vintage Watts link System
  • Xtreme-Grip Vintage Torque arm
  • Sub Frame Connectors
  • Rear Lower Control Arms
  • Moser M88 Rearend Housing and axle with Big Bearings
  • All necessary hardware

Coilover sold separately. See "how to buy" section at top

New Gen 2 Differential Cover

  • New Low-pressure diecast mold ensures better casting strength
  • Includes baffled breather port for the option of connecting our breather or overflow tank to the cover instead of the axle tube.
  • Revised internal fluid dynamics for better R&P and bearing lubrication
  • Eliminated carrier load bolts which were prone to leaking and unnecessary in all but the most extreme drag racing environments.
  • All covers now have threaded holes pre-machined for mounting our diff breather tank.
  • All covers now have 13-14 GT500 temperature sensor port

Other Options include:

  • Powder Coating
  • Complete Assemblies with gear sets and various differential options

Due to the custom nature of these kits, we encourage you to call to order. We will work with you to determine the proper shocks, brake system, and axle system for your setup.