Features and Benefits:

• This kit contains specialty tools for servicing the front and rear crankshaft seals on 2001-2016 6.6L Duramax diesel engines. Includes: 3878 Rear Crankshaft Seal Installer to press fit the rear seal, 3879 Front Crankshaft Seal Installer to press fit the front seal, 4042 Front Crankshaft Seal/Wear Sleeve Remover to pull the front seal without damage, and 4043 Rear Crankshaft Seal Remover with jaws to grab and remove the rear seal safely. All components are precision engineered for Duramax applications. The installers properly fit the inner and outer seal bodies while the removers use controlled force and jaws to prevent seal and engine damage. This comprehensive kit services GM, Isuzu, and GMT800 HD trucks needing front and rear crankshaft seal removal and installation. Compare 3878, 3879, 4042 and 4043 to GM factory tools J-44642, J-44645, J-44641 and J-44644.


This kit contains specialty tools for servicing the front and rear crankshaft seals on 2001-2016 6.6L Duramax diesel engines. Includes: 3878 Rear Crankshaft Seal Installer to press fit the rear seal, 3879 Front Crankshaft Seal Installer to press fit the front seal, 4042 Front Crankshaft Seal/Wear Sleeve Remover to pull the front seal without damage, and 4043 Rear Crankshaft Seal Remover with jaws to grab and remove the rear seal safely. All components are precision engineered for Duramax applications. The installers properly fit the inner and outer seal bodies while the removers use controlled force and jaws to prevent seal and engine damage. This comprehensive kit services GM, Isuzu, and GMT800 HD trucks needing front and rear crankshaft seal removal and installation. Compare 3878, 3879, 4042 and 4043 to GM factory tools J-44642, J-44645, J-44641 and J-44644.