Simple & Complete The system replaces everything in the front end from steering and spindles to K member, along with the #1 cross member or radiator cowl support.  As delivered from Ford, this heavy part is separate from the K member, but is integral in the GR40 unit, which weighs just 42 lbs. complete.  Since the integral design combines the two members, it no longer resembles a letter of the alphabet so we refer to it as the “Front Cradle”.

Proven PerformanceThe geometry is nearly identical to that of the proven AIX National Championship-winning GR40SLA systems already on the market, with the exception of minor changes due to track, wheelbase and center of gravity differences between the S197s and earlier cars.

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Easy InstallationAll parts bolt on except for two small stiffener plates to be welded to the rear shock mounts on the rear axle and, in front, four 7/16” holes drilled to facilitate installation.

Because the SRA Geometry allows for devices such as the TorqueArm and Watts Link or Panhard Bar, the rear axle can be significantly enhanced.

Results from the Solid Rear Axle (SRA) chassis configuration is unparalleled in performance from other designs as it allows for devices to manage longitudinal loads (TorqueArm) and lateral loads (Watts Link or Panhard Bar).

LowThe inherent design of the S197 chassis allows us to make the car be very low in appearance, maintaining the well known “Griggs Stance,” as low as 2-1/2” at the rear K member mounting plate.  The resultant low center of gravity is FAST!

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The SRA Geometry provides room for ehanced predictability of the chassis via the TorqueArm managing longitudinal forces and the Watts Link (or Panhard Bar) to manage lateral loads.

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From Wikipedia: "Independent suspension typically offers better ride quality and handling characteristics, due to lower unsprung weight and the ability of each wheel to address the road undisturbed by activities of the other wheel on the vehicle. Independent suspension requires additional engineering effort and expense in development versus a beam or live axle arrangement. A very complex IRS solution can also result in higher manufacturing costs."

Wider Tires can be used to further increase your rear tire contact patch without having to replace your factory fenders, it is possible to fit tire widths up to 315mm!

Rear Weight Bias ObtainableOur test car yielded a 50.2% rear weight bias with a full tank of fuel and 210 lb. driver.  This was a S197 GT in street trim, with battery in the stock location and all systems stock except for the GR40 chassis and brakes.  Additional modifications can be made to a car to move the wieght bias even further to the rear.

This is designed with comfort in mind. Aside from bushing replacements and a coil-over conversion, there is little that can be done to increase performance or control - proving it less than ideal for racing applications.  You may think we forgot about the "IRS Bumpsteer Kit" - we will discuss that further below.

Griggs Racing chassis systems guarantee predictable performance at the maximum limit: our TorqueArm controls longitudinal movement under heavy throttle and braking, while the Watts Link controls lateral movement and offers roll center height adjustment.  For the serious racer or performance enthusiast, do not overlook this critical detail in vehicle dynamics!

The Independent Rear Suspension (IRS) was introduced at atime when modern construction had not created the most ideal roads. This geometry allows for independent articulation of each rear wheel, which is ideal when dealing with roads that have excessive pot holes. Additionally, it serves as a buzzword for manufacturers.

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We will continue the rear chassis debate by providing a history of each design along with their benefits below. If our short answer was sufficient for you, please make sure to read the  Front Chassis Debate

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The Independent Rear Suspension was implemented by factory production because of attention to NVH (Noise-Vibration-Harshness), prioritizing comfortability out of concern to a wide demographic appeal.  Catering to both the performance and comfort concerns, it was a grand slam that created market buzz talking about the "new and improved design", which is great for marketing material and sales.

Light Weight, Easy AccessThe complete GR40 system saves considerable weight and opens up space in the engine compartment as well, making working on the car a breeze.  Using GR40 aluminum spindles and Griggs 13.5” Sport Brake Kit, total OEM parts weight removed is 261 lbs.  Installation of the GR40 front end alone removes 30 lbs. from the front end of the car, most of it un-sprung.