i don't think that a body modification will affect anything related to your warranty... but i am wanting to change my suspension and add shocks and springs and some others... this could possibly have a warranty issue, because i know someone would say that changing the position of the axle blah blah blah would cause a problem. bull meneur (sp?). unfortunately i have the 100,000 mile warranty. but i may end up going for the mods after all.