I took a look under the hood and found what the mystery part was. Its a engine mount/bushing. I dont know the proper name but it has been changed. I would've felt the vibration if it was broken still, but it purrs like a kitten. I've been a 12v tech for 23 yrs. as well as owning my own speed shop mostly installing and t-shooting stereos,remote car starters,etc. yet i am a virgin to the mechanical aspects of the brick. I must say the engineers had some brilliant ideas along with some questionable ones. All in all, this wont be my last volvo. back to work.- Ryan 96 850 wagon luv it.