97 toyota 4runner shaking over 40 = Please help me!!!?

Steering wheel does not shake at all
engine in neutral at high rpm's does not shake (so not motor mounts)
when driving above 40mph the entire car shakes pretty hard
sweet spot (mild vibration) at 68mph
shifted from drive to reverse several times on a flat surface to check for a clicking u-joint and nothing
What the heck else could it be???
Please help, I'm broke and I commute and I don't want to get stuck in the middle of no where

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