You will have to know how many teeth are on the DRIVE gear (the gear that's inside the tranny, on the output shaft), and you will also have to know the the rear gear ratio, and the tire size, to figure the needed DRIVEN gear (gear on the end of the speedometer cable). Take a look at your transmission I.D. tag, and post it back here. It will tell me what DRIVE gear you have. The code numbers to look for should read something like; 13-52-199. If I know this number, and the other variables, I can tell you what driven gear you will need to correct your speedometer reading.
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