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The Pinion Inner Bearing on 11.5" Rear Axles (HDCS) has been changed for improved performance and Bearing life. This new Bearing will not fit with existing Inner Bearing cup Installer J-44417, but will fit existing Medium Duty Dana 80 Axle Bearing cup Installer J-45240. Due to the depth of the bore, approximately 10" from the cover surface, J-45240 must be used with J-8592 Driver Handle to seat the Bearing cup. To Install, J-45240 and the cup are placed into the bore, and Driven to seat with J-8592. Unapproved methods may not properly seat the cup.