It will fit the following makes and models with 6.0L 6.6L and 7.8L Engines 2004-2009 GMC C6500 Topkick L6 475 7.8L. 2004-2009 GMC C7500 Topkick L6 475 7.8L. 2004-2009 GMC C8500 Topkick L6 475 7.8L. 2007-2007 GMC Sierra 2500 HD Classic V8 403 6.6L (6599cc); VIN D; Automatic Trans.; Allison Trans.; 6 Speed Trans.