8 With the four-link arms installed, the front axle was lowered until the taller Rough Country coils could be slipped into place. Different rate coils are provided, depending on whether the truck is a gas or diesel model. The kit provides two bumpstop extensions. The factory jounce cup and bumper are reused with the extension bolted into place. New sway bar link extensions allow full reuse of the factory front sway bar.