- Last seen
- Joined
- Oct 16, 2022
- Thunderbird Year
- 1956
My speedometer reads about 10 mph slow according to my GPS (and the local sheriff) . It has a 312 with an early air cooled FM automatic tranny and I was told the rear axel was changed at some point but I don't know what gear ratio it is. I saw in the parts catalog there are 4 different gears for the cable depending on the combo. Any way to tell which one I have?