Look at the anti sway underneath. The sway bars have holes further back in addition to holes that are used. Some owners have moved the bolts to the other holes in theory making them working better and less MH sway. I did mine front and back. In the back it helped some. In the front the angle was wrong. I removed the front when I added a heavy duty anti sway bar. In the rear I also added a heavy duty anti sway bar but left the factory anti sway in holes shortening the bar. The term CHF is slang for "cheap handling fix". On the Ford chassis you pretty much need anti sway bars front and rear,