Speedo Calibration Gear??

Use a white 23 tooth gear, available from Jeep dealers. Not the best, but it isn't expensive & will work. Some guys find that they chew up quickly and have a short service life.
EDIT: the 21 tooth is a better match for 3.73 gears after checking http://www.hanlonmotorsports.com/t5speedo.asp calibrator.

The stock range of speedo gears work correctly with a limited range of tire sizes.

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.

needafox said:

can anybody clear this up a little better for me????

Click to expand...

Use the link in my post or see http://www.hanlonmotorsports.com/t5speedo.asp