The Stovebolt Site Forums The Shop Area Driveline Speedometer issue 1956 3100

how many turns does the drive shaft do on 10 full Tire rotation.
do full turns on the tire and see what the shaft does. count drives shaft to full tire rotations.
do more than one turn

in the end you fix the issue a few ways.
if you can get a driven gear that works with current drive gear that matches what you need that is the easiest.
Second easiest is adapter.
third is drive gear and driven gear combo. (more effort to drop drive shaft trans etc)
then more effort more expensive.
Change rear end or the gears in the rear end.
or come up with perfect size tires (not really easy or many not be realistic)