pulsation from 2500 to 4000, stange inside car...
 

i have no clue what it is i searched and all that jazz, but when im going up to 4000 it sounds like a hum/pulse that gets louder and speeds up till 4000, i feel it in the seat and steering wheel and hear it everywhere, but there are no pull probs while it happens. whats the deal?

Leaking exhaust, broken motor mount, out of balance wheels and or alignment.