From a dead stop, it will vibrate the whole front end if I get on it too much. I let off, and ease the throttle....she does not vibrate. It is smooth at all speeds..highway and street. It only happens from a dead stop and if I get on it too much from the get-go. The tires are not spinning on the pavement or hopping. It occurs whether I have the traction control on or off. Ugh...thanks.