Hello all, hope you guys can save me time on my Speedo. I have a aod and put a Speedo cable and when I went for my first drive it was off but was working. It was not slowing down like it should. Then it shot up to 90 and made a terrible noise from the dash. Did my Speedo in the cluster go bad? Was something not right caused it to break? It's a 59.
You may try lubricating it with lubriplate . Take the cable out of the housing and lube it as you put it back into the housing. Had to do this a lot when I worked at a Ford Truck dealer back in the '70's.
@e1956v Rusty at Speedometer Service in Colorado. He is an Alliance vendor. Speedometer, Generator And Alternator Repair In Colorado Springs (speedoservice.com)
What lubricant did you use in the speedometer cable? Don't know if it will help, but I just made a post on my website and YouTube channel about replacing the cable and lubing it with Motorcraft PTFE. https://www.hotrodreverend.com/post/part-119-speedometer-cable-replacement
Mine is a 56 speedo so not sure if 59 was still like this but besides lubing the cable, there is also a tiny weep hole with felt in it on the back of the speedo, just above where the cable attaches, that possibly needs a few drops of 3 in 1 oil in it. My speedo did exactly what you are describing after I had lubed the cable multiple times until I finally decided to pull the speedo and oil it.
Well, since I worked for Ford, it was probably that Motorcraft PTFE. It's been about 45 years ago. (Hard to believe).
So it was the Speedo itself. Something in it went bad. I pulled my original one out of my broken cluster and lubed it up and is good to go.
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