Dan The Gear Man® Tech Note 1977-1991 Chevy & GMC Dana 60 Front Differential Cases PS-141D
There are two Differential Case Offsets for 1977-1991 Chevy and GMC 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. Use Slow Ratio Cases for stock type 4.56-7.17 ratio gear sets
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