If a rear axle is known to be the original axle installed by the factory and the vehicle has a SPID, a simple method to determine the rear axle ratio would be to lookup the axle RPO.
Without a SPID or if it's possible the axle had been swapped
at some point the axle code on axle can be used to determine the axle ratio.
Naturally, this assumes the original gears remain in the original housing.
A manufacturer code will be metal stamped on the axle tube adjacent to the carrier for field identification. This code will be stamped on the right front inboard side, letters and numerals 1/4" high, 3" outboard of carrier and/or are located on a metal tag attached to a cover bolt.
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