I had a 1994 Crown Vic and 165000 miles on it and never a problem with speedo. You need to replace the cable and the gear next time. I guess you know to get the correct transmission plastic gear for your size differential.
If the part keeps getting chewed up the drive gear in the trans must be chipped.
Mechanical
odometers have been counting the miles for centuries. Although they are a dying
breed, they are incredibly cool because they are so simple! A mechanical
odometer is nothing more than a gear train with an incredible gear ratio.
Some odometer has a 1690:1 gear reduction!
That means the input shaft of this odometer has to spin 1,690 times before the
odometer will register 1 mile.
Odometers like this are being replaced by
digital odometers that provide more features and cost less, but they aren't
nearly as cool.
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