Anyone off hand knows what color speedo gear is needed with a 3 speed f100 and a 3.25 gear? Thanks in advance to the brain trust.
Don't know IF the below calculator link will help or not with the truck 3 spd. But it will give gear color for the car transmissions (C6 & 4 spd) once you feed in the required info into the calculator. IF the speedo drive gear on the output shaft in the 3 spd is the same as one of the transmission options in the calculator then it should work.
https://www.428cobrajet.org/speedo-calc
https://www.428cobrajet.org/speedo-calc