Can I Use A Kenny Brown Front and Rear Suspension on my GT500 with the Shelby FR3 Shocks?
The simple answer is yes, you can use the Kenny Brown Front and Rear Grip kit on any 2005-2014 Mustang or GT500 with the factory or Ford, Shelby, and Roush shock kits. One thing to consider however is that these advanced geometry suspensions or any other for that matter are going to want a lot more spring rate than you can accomplish without some high-tech shocks.
The most common scenario is you put a great suspension on the car and you've already got decent shocks and springs, but then you start going immediately faster and run sticky tires, and all of the sudden you find out the shocks and springs are not even close to being capable.
In this video, Kenny explains this in some detail and provides insight into how his suspension systems work, why they like higher spring rates, and the shortcomings of cookie-cutter coil-over packages.