If you have major drivetrain parts swapped a more expensive process involving swapping the odometer drive components is involved. The places listed above will be able to quote the conversion for you. It will cost a good deal more than a simple recalibration.
If you have swapped major drivetrain parts and need to have the odometer worked on, there is an alternative. Look at the link below for ratio conversion boxes offered by APT. It's a small custom made gearbox that goes inline with a custom made speedo cable. It takes the cable turns-per-mile from the gearbox and provides an output that is the turns-per-mile that the speedometer needs to work right. You provide them some numbers and a new speedo cable marked where you want the box installed and they do the rest.
http://www.gaugeguys.com/speedcorrect.htm
Doug L.
--Previous Message--
: Hi.
: I have my car back together again and
: very happily it is not smoking a bit. A
: news set of properly installed rings
: makes all the difference.
: So now my problem is the speedo is
: off by a mile. It appears to be reading
: slow by about 20 percent. My question
: is weather or not it is possible to
: recalibrate the speedometer?
: Thanks. P.J.
:
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