I've seen a set of springs that ome from Japan. Thay are costly.
Me, I would not slam it!!
But whatI would do or consider is replicating the 2006-2007 Sport Edition suspension.
I'm still trying to get suspension part numbers . My dealer claims the Sport edition part #'s not listed yet.
I'm guessing the spring rates ar different and the sway bars are thicker.
I will guess that the struts are the same.
It is not documented in any brochures what the specific suspension differences are between my 06 HL Ltd. and the Sport edition.
If anyone knows wha they are ...let me know.
PS
I've been told by an Unreliable TMS guy that the Limited gets different spring rates as opposed to the base models . I'm not too sure of that. But then again, The 4WD Ltd. is several hundred pounds heavier than the base model stripped down. And those I've driven do handle way different than mine.