ok! i've got a vibration thats driving me nuts! i've got an 89 f-150 with a 302, the engine was rebuilt about a year and a half ago. anytime i put the engine to 3 grand or above it starts to vibrate in any gear. i put the truck in neutral and put the engine up above 3 g's and it vibrates. the only thing i could think that would cause the vibration would be the flywheel but i'm not too sure. any ideas??