Hey does anyone else feel the floor shake a little when they floor it in there 4Runner? Its like when I add a lot of gas, the whole car feels like its vibrating a little. Anyway, I have had a 1998 and 2000 4runner, and they both do it.

tires need balancing?

maybe driveline has a dent?

Mine does that. It feels like the tires though. We still have the winter rims and tires on :S

I don't think it's the tires, it's just means engine's working hard :thinkerg:

did you check engine/trans. mounts ? I know my truck has a lot of vibration during accell, especially under load. my car shudders on letting the clutch out. Just a thought.