the front seems fine with .920 torsion bars and Bilsteins
circle track rear springs and Bilsteins ,ride seems harsh in the rear.
thinking maybe softer rear springs and keep the Bilsteins?
You could always swap out the Bilsteins for another set (borrowed, perhaps) in the rear just to see if it's the springs, or the shocks.
I wouldn't say the ride with the Bilsteins was harsh in the Mustang, but the damping/rebound rates were definitely not "soft", and the car felt much more planted at speed. I really noticed a difference when powering out of corners that had less than perfect road surfaces - instead of skipping sideways or pushing into oversteer, the rear held firm with the Bilsteins in place. They didn't degrade the ride quality, and it's not that those GTs were known for a cushy suspension in the first place.
