This might be more information than you might want, however, it does explain how to correct your speedometer reading, if you are so inclined, and your car has one of the listed transmissions...
chevellestuff.net
Transmission Speedometer Gears
Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes.
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