GR40SS "Super Street"
Includes the foundation to make a street-driven Mustang into a smooth riding Porsche killer. This kit was configured to give you incredible hookup and cornering performance. This system focus on the weakest link in the S197 platform the front suspension. This is the best place to start on your S197 Mustang and will give you a great foundation for future upgrades. Major components include Coil-Over Front Struts, urethane bushings and the GR40ST Rear Suspension. Installation is as easy as it gets with no welding required. Whether you drive your Mustang to work or in the canyons this kit is guaranteed to yield significant performance improvements.GR40ST Ultimate Street Performance
The first of the Griggs Racing S197 SLA systems, includes the foundation to make a street-driven Mustang into a smooth riding Porsche killer. This kit was configured to give you incredible hookup and cornering performance. This system focus on the weakest link in the S197 platform the front suspension. Significant weight will be shed from the front end and give you a great foundation for future upgrades. Major components include a Tubular Front Cradle, Koni Coil-Overs and an SLA System. Installation is as easy as it gets with no welding required. Whether you drive your Mustang at the strip or in the twisties this kit is guaranteed to yield significant performance improvements. This is the most popular SLA system.GR40TT Autocross/Open Track System
The second of the Griggs Racing S197 SLA systems is engineered for the serious Mustang driver that uses his car on the road course, and still occasionally drives on the street. The kit includes all the components as the Ultimate Street Kit but includes adjustable Severe Duty Lower Control Arms, spring rate changes, and Watts Link. This system will improve performance over the Ultimate Street System but it will have a slight increase road noise.GR40RT World Challenge / American Iron
The kit that wins it all. THE standard of excellence. The most popular chassis system in late-model road racing history. Twelve years in development, it is the most dominant system on the market today. The proof is in the race records. If you want to be consistently fast you need the GR40RT chassis. If you don’t win with this, its time to check your driving. There is no comparison for this one. And race parts with a lifetime warranty... really
Why Griggs Racing?
. Each kit includes a provision for solid mounting the motor in a way that greatly increases chassis stiffness, without using motor plates that are expensive to install; affording the serious enthusiast nearly the same rigidity as full motor plates, but can be installed without touching the engine, or even removing it from the car during installation. The rear plate is shaped to accommodate all known long tube header combinations.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 CG differences between the ‘05s and earlier cars.Low
: The inherent design of the S197 chassis allows us to make the car be very low in appearance; while maintain the well know “Griggs Stance” as low as 2½ inches 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 to spindles to K member, along with the #1 cross member or radiator cowl support. Delivered from Ford this is a heavy part and a separate piece from the K member, but integral in the GR40 unit which weighs just 42 pounds 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”.Light weight, easy access
: The complete GR40 system saves considerable weight as well, and makes working on the car a breeze. Using GR40 Alum spindles and Griggs 13.5” Sport Brake Kit, total OEM parts weight removed is 261 lbs. Total installed GR40 front end weight removes 30 pounds from the front of the car, most of which is un-sprung.Rear weight bias obtainable
. Our test car yielded a 50.2 % rear weight bias full of fuel and with 210# driver, this was a GT in street trim, battery in stock location all systems stock except for the GR chassis and brakes. Other mods and/or track prep could move the weight back further.BIG TIRES FIT:
The Unique GR40 SLA design allows us to fit under the stock sheet metal 305-18 tires on 10.5” rims, are standard Front and Rear. Larger sizes will fit.Easy Installation:
All parts bolt on except for two small stiffener plates that need to be welded to the rear shock mounts on the rear axle. In the front, four 7/16” holes must be drilled to facilitate the installation.Incredible feel, input and response.
The first impression of all drivers that have tested this chassis is the car drives and feels like it weighs half of its real weight. All SN197 GR40SLA cars require a steering rack change due to dimensional differences, and two racks are offered. Recommended for vehicles driven primarily on the street is the variable ratio unit with gearing as used on 03-04 Cobras. For those that demand quicker response, we also offer a very quick responding steering rack for those that want fast response and this is recommended for autocrossers, experienced road racers, and drifters. This system steers faster and more accurately than any GR40 system to date. We also supply a larger competition suitable steering fluid cooler with all fittings and hoses to replace the extra long power steering hoses that are in the way of a clean installation, and to ensure long life of the PS system.