Specifications Number of Cover Bolts 12 Differential Case Construction Type Ford 9.75 Number of Pinion Teeth 10 Pinion Shaft Diameter 1.97 (in.) Number of Pinion Splines 31 Pinion to Driven Gear Ratio 3.55 Number of Pinion Bolts 12 Pinion Diameter 9.75 (in.) Pinion Material 8620 Steel Pinion Rotation Standard Number of Pinion Teeth 39 Taxonomy A Differential Taxonomy LD Taxonomy B Pinion and Driven Gear Taxonomy C Ford 9.75 Taxonomy D Rear Vehicle Applications 1997 Chevrolet Avondale 2003 C 2010 Ford E-150 2003 C 2005 Ford E-150 Club Wagon 1997 C 2002 Ford E-150 Econoline 1997 C 2002 Ford E-150 Econoline Club Wagon 1997 C 2002 Ford E-250 Econoline 1997 C 2010 Ford Expedition 1997 C 2010 Ford F-150 2004 Ford F-150 Heritage 2002 C 2003 Lincoln Blackwood 1998 C 2010 Lincoln Navigator