My dealer told me the FJ lift kit will bolt right in, if that helps.
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'99 "Big Boy" 4Runner SR5 4wd
ARB Bumper/ SmittyBuilt winch/ Hella 500's, Roof Rack,Deck plate Mod/ ISR mod/ TRD "O" TB gasket/ K&N air, FlowMaster,3" Toytec front, OME 851 LC 2" lift coils rear, extended length LC shocks rear, diff drop, Toytec brake line extension, Definity Dakota M/T LT265/75/16 tires,Lowrance GPS, Kenwood head unit, Sony Xplode 4 channel 800 watt amp, rear Stealth speaker box w/ 10" JL sub, backlit Inclinometer, Cobra 19 CB, TRD Off Road decals