Our reducer has Stewart-Warner on both ends and is original to the car unless some sneaky devil switched it. With 4:10 gears you would be winding it pretty tight to go off the end of the speedometer scale. I found the speed warning buzzer handy though.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.