Chevrolet C/K/R/V 6.6D Year Alt Upgrade Large Frame 2001 8247 8237 2002 8247 8237 2003 8291 8292 2004 8291 8292 2005 8291 8292 2006 8292 11076 NA 2007 8301 11234 NA 2008 8301 11234 NA 2009 8301 11234 NA