This kit is a "short" add-a-leaf kit in that it doesn't meet up at the spring mounts or upper retainers. No one really manufacturers a "long" add-a-leaf setup for the F150s, so it's tough to say what the difference in ride quality would end up being. That being said, this kit does tend to stiffen up ride quality a bit, especially with the factory rear shocks. The effect is much less noticeable with aftermarket shocks.