71 roadrunner speedometer issues

[nkrupa71]

So I have a 71 roadrunner, the last time I drove it on the road which was about 3 weeks ago, the speedometer needle started to bounce around 40 mph and the gauge itself was vibrating and making a humming noise. When I got to a light, it stopped bouncing and humming. Occurred twice while I was driving. Any suggestions or comments would be much appreciated! Thanks!

 

[PurpleBeeper]

It sounds like your speedometer cable is hanging up inside the housing. You might want to see if you can get some graphite up inside the cable housing. It'd be best if you could remove the cable from the housing, but I can't remember if that's possible.

 

[drobertson]

A new speedometer cable isn't that expensive,,, fixed a similar issue on my car.