I have some strange vibrations? My pick up is vibrating between 25 and 15 mph when I am slowing down - for some reason it is worse when I am braking moderately. Just tonight it began a growl at about 65mph but became quiter after a few miles, but I still think I feel something different. I have also notice a litte "shudder" when I take off from a stop. Any advice is apprreciated. 03, 3500, 4wd, 6 spd, 120k miles