I need help!!! I've got a 97 gt with some minor mods, procharger, tranny, 4.10 gears, so on and so forth. when i get between 90 and 110 the whole car feels like it's going to shake apart. It also makes this god awful noise. only a couple of mods to the rear, like the 4.10 and a posi trac. And running stock height and suspension. has anyone run into anything like this before. And what did you do to correct it. Thanks folks.....