Thank you! I decided to leave the rear leaf pack as is, I am happy with how it looks and rides great. I think that howl I am hearing is the tires. They are new meaty MT's, it feels like I can feel the knobs at 1-2 MPH, over 5-10MPH, nothing. No vibes. The larger diameter and heavier tires, the trans if shifting more, lost a little pep. Oh well.