Here are two sites to help you out. Your old speedo cable will thread into the 700R4. You will need to know what gears you have. You will have to unbolt the rear housing and remove the drive shaft to get to the drive gear. http://www.bowtieoverdrives.com/catalog/catalog.php?Action=GETSUBCAT&CATID=DA2 http://www.transmissioncenter.net/speedometer_calibration_______va.htm#700r4