On cold mornings my speedometer doesn't read correctly. Everything under 40mph is normal, but once I hit 50 or so the speedometer goes to 140 and stays there. I also hear a knocking/whining when this is happening. It has also started to do this more often and in warmer weather.

Could this just be a bad cable/connection from the speedometer to the tranny (tighten the connection on tranny)?
Would WD-40 w/ graphite fix this?
Or should I just replace the speedometer cable?

Just looking for suggestions/solutions
Thanks

 

sounds more like the speedo head is going bad.

 

Check your flex capacitor, sometimes jumping to warp speed has adverse effects on it.

 

I was hoping that was the issue.

WTB: Flux Capacitor. PM me Pleeaassee.

 

1.21 jigawatts!!

 

Post counter?
LOL.......
J/k!

 

i had a similar issue when i first got my 80. Previous owner thought it was the cable, so i replaced that only to find the stock one perfectly intact, and the speed still being crazy. So i snatched up a used speedo on Ebay, threw that in and voila.