Topic: 79’ TA speedometer stopped working

[jvmagic]

Hi,

I have a 79’ TA and the speedometer started to make a bird chirping noises  a few months back until  the speedometer stopped working.

I did the speedo cable test by disconnecting from the tranny, drill in the reverse position, and the speedometer did work.  I connected the cable and then went to the transducer.  I disconnected the smaller cable from the transducer and connected to the drill and the speedometer did not move. I’m not sure what that means so I’m hoping for some guidance. 

How can I confirm it’s a cable or the transducer? 

79’ Trans Am
403 motor
350 tranny
Cruise control


Thanks in advance