• Press fit front seal to engine block & crankshaft for proper fitment of inner & outer seal body (works w/ 3878)
• Services GM/ISUZU 6.6L Duramax 2001+ GMT800, 2500HD & 3500
• Installation instructions: Set new seal on inner body of tool. Attach outside ring of tool to the end of the crankshaft assembly, turn forcing screw to press in new seal
• Compare to GM Factory tool J-44642
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