Note: This method can be used for calculating the speedometer gear for any vehicle: Mustang, Ford etc. What steps are you required to take to determine what speedometer transmission gear will fit your vehicle? Let’s find out. Ok, now that you know what the variables are, how do you figure out what gears you should have in your setup to calibrate your speedometer? To solve those I offer the calculators shown on the Calculator tab.How Do I Know Which Speedometer Gear Do I Need? And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. Driven Gears: This is the gear that is on the end of the speedometer cable that plugs into either the transmission or transfer case depending on if it is 2wd or 4wd.But, the Driven Gear tab also lists the drive gear in the tables, so you can look the drive gear up there as well. The Drive Gear tab lists the drive gears used for each year, transmission or transfer case, and axle ratio. Drive Gears : This is the gear that is on the output shaft of the transmission if the truck is a 2wd, or on the output shaft of the transfer case if it is a 4wd.One of the perennial questions is "What gears do I need to use to get the speedo to read correctly?" "It depends" is the best answer as there are several variables involved, including the rear tire size, or more correctly the tire's rolling diameter, the rear axle ratio, the speedometer drive gear, and the speedometer driven gear.īut the terms "drive gear" and "driven gear" are somewhat confusing, so here's are definitions: Entrant #25: Bruce moose4x4's 1996 BroncoĮntrant #27: Troy/66gtk's 1983 F150 XL SWB 4x2Įntrant #30: Mehmetcelikel's Brownie DuallyĮntrant #31: Kristopherdb's 1985 Flairside 4x4Įntrant #35: Dan aka dblohowiak's 1986 F250HDĮntrant #38: Jonathan's 1986 F350 short bed crew cab IDIĮntrant #51: Ken & Kathy's 1985 Flareside
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