Dana 60 There are two Differential Case Offsets for 1999-2004 Ford Super Duty Dana 60 Front Axles to accommodate different pinion gear diameters. Fast Ratio Cases are for 3.54 to 4.30 gear sets and they can also be used with special Thick Ring Gear Sets for 4.56-5.38 ratios. Slow Ratio Cases are used with stock type 4.56-7.17 ratio gear sets.
1999-2004 Ford F250 and F350 Super Duty available factory axle ratios were 3.73, 4.10, and 4.30. F450, F550 Super Duty trucks were offered with 4.30, 4.88, and 5.38 axle ratios.
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