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From
http://lists.twistedpair.ca/pipermail/galaxie/1998-March/001242.html



Another easy way to get your speedometer correct:

1. Drive your car and find out how far the speedometer is off. For example,
it may indicate 45 when you know you are going 60. Then, simply remove the
speedometer gear, count the teeth and multiply by the ratio (45/60) to speed
up the speedometer. You need less teeth to speed up the speedometer or more
teeth to slow it down.

2. Take the speedometer gear to your local Ford dealer and ask for one with
the desired number of teeth.

The nice thing about this method is that it takes everything into account
(transmission, rearend, tire size, etc). I did this just a couple of weeks
ago when I changed my rear end ratio from 2.80 to 3.25.

Mike



Key words

speedometer gear ratio number of teeth rear end
 
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