The Ford Barn - View Single Post - speedo gear-in tranny

Daves55Sedan · 11-17-2021, 08:28 PM

Re-reading the op's post again; as long as you are not changing your original rear-end gears to a different ratio or changing to a different tire size, just count the number of teeth on your original speedo driven gear and select a new gear with matching number of teeth in the transmission you are installing.
If you are swapping to a '57 or later FM, you should be able to remove the rear extension housing and speedo drive gear off your new transmission and install your old speedo drive gear and extension housing and keep your original nylon speedo driven cable and gear.

11-17-2021, 08:28 PM	#9
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: speedo gear-in tranny Re-reading the op's post again; as long as you are not changing your original rear-end gears to a different ratio or changing to a different tire size, just count the number of teeth on your original speedo driven gear and select a new gear with matching number of teeth in the transmission you are installing. If you are swapping to a '57 or later FM, you should be able to remove the rear extension housing and speedo drive gear off your new transmission and install your old speedo drive gear and extension housing and keep your original nylon speedo driven cable and gear.