Gene K

I think Im going to give a set of GT500 Coupe (166 lb/in) rear springs a try on my GT Deluxe. Ive decided the Roush rear springs just are not right for me. If the ride height turns out to be reasonable (Stock height to 0.5" Lower I am going to try some better shocks. Maybe the Koni STR.T.

Essentially Im trying to replicate the 2010 GT Base Suspension (Same front springs and bars as 2005-2009 with 166 lb/in rears and better damping).

socalwrench

Here's some useful information: https://mustangforums.com/forum/s197...g-allowed.html

GT500 springs have a taller installed height and will probably raise the backend of your car higher than stock. The last rear springs I looked at were approx. 175 lb/in (so 166 lb/in is probably accurate).