I have a plastic laminated card that dealerships gave to their sales personnel that says 3.07, 3.54 and 3.73 were the ratios available from the factory. Since they are Dana axles there is a whole bunch available as after market choices. HTH, DougS
PS I found another card that lists 2.72, 3.31, 3.54 and 3.73 with no mention of 3.07. Neither card indicates what years they are for.