Reducing body roll. SS springs, sway bar, or both?

Before I added a rear sway bar on my Duster I had similar issues with body roll and my 295/40/18’s having a little contact on the inner wheel well. After the sway bar I had no issues at all, and that’s with 120 lb/in rear springs.

The problem with SS springs isn’t just the ride height, they’re too stiff for most handling set ups. Typically these A-bodies when set up for handling have a rear spring rate around 120-130 lb/in, and use a rear sway bar with that rate. The rear bar is helpful because most of the aftermarket ones are adjustable, so, you get your base spring rate and then adjust as necessary for your car and its particular set up.

A-body SS springs are 160 lb/in, which can help hook for straight line traction but is too stiff for the vast majority of handling set ups. Some of that will counter the additional roll couple from raising the rear ride height, but again, not ideal at all for a car set up for handling.