Description

Backordered with no ETA (Updated 6/3/25)

Fits: 2001-2016 6.6L Duramax LB7/LLY/LBZ/LMM/LML

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-44645

CTA: 3879