speedomter cable

[63 wrongbed]

I put in a 63 fordomatic transmission in my 63 F100, it had a 3 on the tree I used the original cable but it is reading about 15 mph slower. I was wondering what tooth gear I need to get for it read correctly, any help much appreciated

[longcabjohn]

use the gear from the 3 speed, gears match rear end not trans



Johnny

[63 wrongbed]

I used the speedometer drive gear from the 3 speed, it reads 15 mph slower bat 40 mph

[chris401]

If it was reading wrong before and seems to operate normally it probably had the 4.56 axle originally. Do you know the current axle ratio?