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I know taking the cover off and counting is the easiest method, but this has had me intrigued for a while now, the same axles with the same gears but different "stock" tires end up with varying actual ratios.

If the blazer came with 31x10.50r15 tires and is advertised as having a 3.42 axle ratio, did it in fact have a 3.42 effective ratio with the 31" tires stock?