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05-10 GR40ST Ultimate Street Front SLA Chassis System
[S197 GR40ST Front]

Kit Contents

  • Tubular Front Cradle
  • SLA Tower Kit
  • Bump Steer Kit
  • GR40 Lower Street Steering Shaft
  • Steering Rack Kit
  • SLA Tubular Front Lower Control Arms
  • SLA Street Front Upper Control Arms
  • Ball Joints
  • Upper Ball Joint Adapter
  • Koni SLA Street Coil-Over Kit
  • Front Anti-Roll Bar Kit, Zero Bind


Characteristics of GR40 SLA Systems

Rigid:  Each system includes a provision for solid mounting the motor in a way that greatly increases chassis stiffness without using motor plates, which are expensive to install.  This affords the serious enthusiast nearly the same rigidity as full motor plates, but without the need to remove or even touch the engine during installation.  The rear plate is shaped to accommodate all known long tube header combinations.

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Proven Performance:  The 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.  

Low:  The 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!

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”.

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Light Weight, Easy Access:  The 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.

Rear Weight Bias Obtainable:  Our 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.

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BIG TIRES FIT: The unique GR40 SLA design allows us to fit 305-18 tires on 10.5” rims (standard front and rear) under stock sheet metal.  Larger sizes will fit.

Easy Installation:  All 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. 

Incredible Feel, Input & Response:  The first impression of all drivers that have tested this chassis is the car drives and feels like it weighs half of its actual weight.  All S197 GR40SLA cars require a steering rack change due to dimensional differences, and two racks are offered.  For vehicles driven primarily on the street, a variable ratio unit with the same gearing used on 2003-2004 Cobras is recommended.  For those that demand quicker response, we offer a very quick-responding steering rack, recommended for autocrossers, drifters and experienced road racers.  This system steers faster and more accurately than any GR40 system to date. 


You must supply your own SN-95 ('99-'04) spindle and hub assemblies

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