I've checked eVeRYTHiNG, yanked on every bit of the suspension with my 4ft pry bar just to see if it has excessive play. I figured if it was the upper mount (considering it's a pillow ball type) I'd be able to physically see if it was damaged, but I'm having a very hard time figuring out where the trouble spot is. I've done the wheel shake-down and I've got nothing on ball joints or the tie rods. The noise happens whenever the right front suspension hits a sudden undulation in the road, and at high speed I can feel a vibration from that side as well (55mph+). Could this possibly be a wheel bearing problem that isn't audibly groaning? I've experienced something similar when I was working at Toytoa.