Speedometer cables and gears haven't been used for a couple of years
now. There is a sensor that picks up the shaft speed, and the computer
converts it to a speed. The dealer can recalibrate the computer.

Bruce L. Bergman wrote:
On Wed, 20 Jul 2005 18:00:09 -0400, "BW"
wrote:

I just picked up the new one and drove from Florida to MA, a trip I've taken
at least 20 times with 4 different vehicles. The milage has ALWAYS been 1245
+/- 10 miles. Most times it's within 2-3 miles (a creature of habit I guess.
Same places for gas, same hotel, same restaurants).

They put the big-tire speedometer cable drive gear in the trans, and
small tires on the car. The dealer parts counter can sell you a
replacement drive gear for the transmission with one or two more (or
less) teeth, which will correct the error. (Or at least get it a
whole lot closer.)

Or a good speedometer shop can sell you a little gearbox that goes
inline behind the speedometer head, and drops the cable speed going to
the speedometer by whatever gear ratio you need to get as close to
dead on as possible - someone said 6% for your car.

They are made for people running road rallies, where having the
odometer dead-nuts accurate is very important.

And then you change tire brands or change the tire size slightly
(and the running road-contact OD of the tires) and knock the
calibration off again.

-- Bruce --

--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
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