So I think I have my vibration problem traced to the driveshaft. It has to be either out of balance or twisted slightly. Now I'm looking to replace it with something that will hold up to around 400-500 rwhp. Does anyone know what kind of hp numbers the Ford Racing aluminum driveshaft is capable of supporting? I am also looking for other options, so if you know of any other places that make a HD shaft, let me know.