Randy,Don't know a lot about it, but Liquid Springs appear to be a really major chassis modification---not to mention really expensive as well. Not in the same league as upgrading shocks or individual suspension components (and not a self-installed option for most folks). Bet there aren't a great number of "upgrades". Most of the folks with them got them with new builds.Mike
The real question would be do they work. I cant find any anyone who has installed them on a E450.