Dynatrac Free Spin Heavy-Duty Hub Conversion 1999-14 Ford Super Duty F-250/350 FO60-3X1104. Fits: 1999 - 2003 Ford 7.3L Powerstroke; 2003 - 2007 Ford 6.0L Powerstroke; 2008 - 2010 Ford 6.4L Powerstroke; 2011 - 2016 Ford 6.7L Powerstroke.
