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Originally Posted by Duke2.6
The speedometer gearing is set up for the 849 revs/mile of the OE 185/65R-15 tires and the axle ratio is 3.27:1, so revs at 60 are 849 x 3.27 = 2776.
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These revs would be applicable with a manual transmission with the rear wheels directly coupled to the engine.
However, in the case of an automatic, with a fluid coupling, the actual rpm at 60 mph is going to be 200-300 higher than 2776, and, hence the posted 3000 rpm figure.