Amazing what new parts, attention to detail, and "blueprinting" stuff does to make your ride easier.This 8.5" rear end that I built is totally silent on coast... the 7.5" that I had 'professionally built' had a whine on coast from day one... first drive no noise. I can feel the ever so slight reduction from 3.55 to 3.42. A little bit less leap. The new bushings on the rear control arms are so smooth, it makes me want to do the fronts now.