J-44642 Rear Crankshaft Seal and Wear Sleeve Installer Tool For Isuzu Duramax 2001-Later GMT800 2500HD 3500 with 6.6L Engine. This tool is designed to correctly install the rear crankshaft oil seal and wear sleeve on 2001-Later 6.6L Duramax engines (GMT800, 2500HD, 3500).
