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do you still have yoru stock rims? if so, bolt them up. it could be the low profile tire you are using or if the rims arent hub centric they could be off just a bit...i know the tundra world has an ongoing issue with some aftermarket rims being fine one moment and then shaking all over the next. i'd swap wheels/tires and drive it to see if its a suspension issue or just a tire/wheel issue. it could be that all is as good as its going to be, running low pro tires will cause alot more vibration and bumps to be felt...just nature of the beast.