The Ford Barn - View Single Post - Need How-to info

coilover · 12-23-2010, 11:49 PM

Bow Tie Overdrives has a chart where you plug in your tire size and rear end ratio and it gives the drive gear and driven gear tooth count for correct speedo reading. It's for GM so the gear part numbers and colors (on GM plastic gears) won't mean anything but the tooth count will be right for any brand car. Ford probably has gears with the same tooth count. A good speedometer shop will also have an adaptor that fits on the tranny just like the speedo cable and then the cable fits on the other end of this. They can either over or under drive the output of the speedometer gears in the trans.

12-23-2010, 11:49 PM	#8
coilover Member Join Date: May 2010 Posts: 33	Re: Need How-to info Bow Tie Overdrives has a chart where you plug in your tire size and rear end ratio and it gives the drive gear and driven gear tooth count for correct speedo reading. It's for GM so the gear part numbers and colors (on GM plastic gears) won't mean anything but the tooth count will be right for any brand car. Ford probably has gears with the same tooth count. A good speedometer shop will also have an adaptor that fits on the tranny just like the speedo cable and then the cable fits on the other end of this. They can either over or under drive the output of the speedometer gears in the trans.