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all i know is that the fj was designed around a certain wheel size, tire size, and backspacing... spacers change that geometry, and cause forces and moments (think physics....) where they're not supposed to be... but, you'll have issues with any changes from stock if you're talking equipment lasting as long as the factory gear would... if you understand how everything works and the effects of changes, you'll be fine... Keep an eye on everything and if you can't tell, it never hurts to have a trained set of eyes on it every once in a while...
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