I installed the Hellwig sway bar front and rear, adjusted the hellwig overload springs, pulled them down from 5 in to 3 in.Took for a test drive passing 18 wheelers and other large trucks no more tail wagging and took almost all the rocking feeling out of steering much improvement.
Mine was bottoming out on dips and speed bumps. I am third owner. I drove from Fl to home 1k and I said something is going to change.Much better but will keep working on it
FWIW Hellwig seems to be telling folks to adjust them down to 2". Not sure if its different on your 2009. I know the Ford chassis had a change that allowed for an additional 500 pounds on the front axle; yours may not have that modification given its age.
__________________ 2023 Ford F-150 XLT SCREW 3.5EB (Max Tow Pkg., Black Appearance Pkg., Bed Utility Pkg.)
1727 Payload / 4150 RAWR