1972 Chevy El Camino determinig final gear ratio

1972 CHEVROLET EL CAMINO
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AKAHOSHI
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Drive Train Axles Bearings problem
1972 Chevy El Camino V8 Two Wheel Drive Manual 90k miles

Isn't there a quick way of determining gear ratio? I sort of remember having to rotate the drive wheel and at the same time count the rotation on the drive shaft? It's been awhile since my high school days. I think the el camino came with 3:73, but I want to reduce inorder to lower my rpms @ highway speed and still keep my Richmond T-10 4spd.
Thanks!
Feb 23, 2009 at 1:23 PM
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DOCFIXIT
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That's right rotate tire once count turns of shaft.
What RPMS does it turn at 60mph?
Feb 23, 2009 at 3:56 PM
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