Very often it becomes necessary to recalibrate the speedometer after changes are made to the rear axle ratio or rear tire size.  Sometimes this can be accomplished by simply changing the ddriven gear at the end of the speedo cable thatss inserted into the transmission.  Before this gear can be changed the correct tooth count must be confirmed based on the changes made. 

In order to determine the tooth count for the "driven" gear it is also necessary to know (or find out) the exact tooth count on the ddrive gear located on the output shaft of the transmission.  Some transmissions use drive gears that have 1 or 2 different tooth counts.  This can be found by removal of the transmissionss tail-housing, or simply finding out what the standard OEM tooth count is.  Once that information is available using the provided tooth-count calculator for the driven gear is an easy task.

Keep in mind, that very often only a limited number of driven gears are available for specific transmissions.  Sometimes it becomes necessary to use a gear with the closest available count.    

 To access our Tooth-count Calculator use the link provided (Above).