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The Rear Crank Shaft Seal on Gen V V6/V8 Engines is Installed in reverse to Gen IV Engines, and existing Installer J-41479-B will not fit the new Seal. J-41479-10 is an Adapter that fits new Seal, and is used with previously essential J-41479-B to Install the Seal correctly, without having to remove the Rear cover. Rear cover Removal requires removing the Oil pan. The new Seal and J-41479-10 are placed onto the Rear of the Crank Shaft and Piloted into the Bore. J-41479-B is attached to the Crank Shaft, and used with J-41479-10 to seat the Seal. Unapproved methods will damage the Seal, cover, or Crank Shaft.