I assume you have verified your body mount bushings are all in good shape? Are your rocker arms front and rear the same distance to the ground with it up on the jack stands?

We'll work on this GTO project soon once we finish the last mods on the Silverado this week. My friend is looking for a suspension upgrade and Ridetech seems a good choice. The new rotors and tis wheels arrived so we can clear the garage tomorrow.

Is the car a highway driver or more geared for auto crossing ? he needs to know what he really wants out of his highway ride, big difference between highway and auto crossing.
Ridetech is a great product, however, for my preference I personally should have done more research for what I ultimately wanted from a highway ride perspective.
https://lateral-g.net/forums/showthread.php?t=58995

Don't reply to that guy. He's just a spammer that wants you click his garbage link.