Spedometer Gear Question

Hello All,

We bought a 66 Polara 383 2Dr Hardtop for my son about a year ago. We bought it at an auction and it was stated it had a "New 727 Transmission". So take that for what it is worth.

When we got the car, the speedometer was not operational. We assumed they never ran the cable after the tranny swap. However after buying another cable, we found the old cable there, just not plugged into the transmission. So we plugged it in and viola a moving spedometer.

However it doesn't seem...

Spedometer Gear Question
Author: griswold00