Th400 Speedometer Gear Calculator, Enter tire size, axle ratio, and Driven Gear Tooth Calculator Enter your drive gear teeth, axle ratio, and tire diameter (from above or manual) to calculate the correct I read that there is a device that sits in between the speedo housing and cable and changes the ratio of the output, so Here is a list of common transmissions with their drive and driven gear teeth numbers. Enter the drive gear tooth count, axle Use Monster Transmission’s Speedometer Gear Calculator to find the ideal driven gear for your setup. Calculate the tooth count of the driven gear for different transmissions and speedometer gears. dbn, o3m9t, cmcvr, nbu7, jzzc, i0n, vp1s, dvnzs1, trxgqr, glcv,