Question About Fixing Speedo

17 inch tires really throw it off from what i hear. id try a 31 tooth gear i believe.

See http://www.hanlonmotorsports.com/t5speedo.asp for help with the speedo calibration.

The 23 tooth gears tend to be difficult. Some guys have no problems, while other guys find they chew up and last 3 months.


Here's some more sites to look at:

http://www.geocities.com/mgnedell/notchback/tech/speedo.html


See http://www.corral.net/tech/gearcalc.html for more help

Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.

See http://www.gaugeguys.com/ratioadapt.htm for more info.

I just borrowed a hand held GPS unit that tracks speed over land. After a few trips to work, I know that my speedo reads about 7mph too fast on average. So, whatever the speed limit is, I drive 10 mph faster according to my speedometer. 55 mph zone, 65 mph on speedo, Im going approximatley 58 mph. I've done this for a few years and I have yet to get any tickets. Besides, people are always hauling *** around here so I really don't worry about getting any speeding tickets.