Since replacing the Pantera's stock 4.22 ring gear with a 3.77 and a taller 5th gear obviously my odometer on my speedo is off...just curious how much it is off...anyone done the math? The rear tire diameter is 27" Mad Dawg Antenucci Team Pantera Racing The 1st & still the only vintage race team in open road racing www.teampanteraracing.com