Looks like it's either the tranny or driveshaft. I had all 4 tires spin balanced. No difference. It actually may be a tad worse. But anyways...
I pressed in the clutch 4 different times while on the interstate and the vibration going on. Each time the vibration continued. I guess the next logical step is to put the tranny in neutral and see what happens. If the vibration subsides (which I actually hope it doesn't) then the problem is with the tranny. If not, then we move on to the driveshaft.
Thanks guys!
-ftyler
