Speedometer calibration. January 05, 2006, 05:50:07 PM Have an '88 Tbird sport with AOD trans. I am building an 8.8 axle with 4.10s. I have a 23 tooth gear on the electronic speedo sensor that gives me the correct MPH for my 3.73s. Anyone ever heard of a box I can put on my speedo sensor to recal the speedo, and where can I get one? Quote Selected