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[Swingshiftworker]

My guess is that lifting your FJ in any way (and adding oversized wheels and tires) will probably result in voiding (or actually the refusal of Toyota to honor) your warranty for any suspension related claims and could also put you at risk of "voiding" any axle or drivetrain claims as well.

If this happened you could try to sue Toyota for failing to honor the warranty, but you'd have to prove that the changes you made did not "materially" alter the sytems in question, which (unlike changing the type of air or oil filter you use) would be very difficult to do if you lift your FJ, body chop it and mount oversized wheels and tires. So, if you don't want to "self-insure" for any potential problems related to the lift, just don't do it.