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When I changed from 3.73 to 3.08 it made my speedometer
15 mph slow. I was already using 60 series tires and it
was a little slow to begin with.
I had an article that Hot Rod Magazine did on this problem
and it was full of all the formulas and gears available.
There are actually 2. They are ,or were, color coded.
I figured out what I needed and went to the dealer. He
had the cable gear and showed the inside gear. When
he tried to order it, it came back as discontinued.
There was a fellow who advertised in Hemmings that
could build a unit to fix any of these problems. I ordered
one of the units after giving him all the measurments
he requested. The unit made the speedo 15 mph fast.
I gave up out of frustration and decided to live with it.
There are advantages to this. I know that when I am
showing 55, I am actually doing 70. It is a cobweb in
my truck and does bother me a little. I would like to
hear what others have done.
EdB
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