ProActive Gears NP261/263 | NP271/273 Transfer Case 1.5" Sprocket Drive | Driven. Fits: 1999 - 2003 Ford 7.3L Powerstroke; 2001 - 2004 Chevy/GMC 6.6L LB7 Duramax; 2003 - 2004 Ram 5.9L Cummins; 2003 - 2007 Ford 6.0L Powerstroke; 2004.5 - 2005 Chevy/GMC 6.6L LLY Duramax; 2004.5 - 2007 Ram 5.9L Cummins; 2006 - 2007 Chevy/GMC 6.6L LLY & LBZ Duramax; 2007.5 - 2009 Ram 6.7L Cummins; 2008 - 2010 Ford 6.4L Powerstroke; 2010 - 2018 Ram 6.7L Cummins.