Mulitple Make Application DC-AA-14-11.5 ATS Protector Rear Differential Cover - 14-Bolt, 11.5 Ring Gear American Axle Fits: GM 2001+ 2500HD & 3500w/ Full Floating Axle (All Duramax & 8.1L Equipped Trucks) Dodge 2003 2500 High Output Diesels 2003 3500 Standard & High Output 2004-2006 2500 & 3500, Standard & High Output Diesels