On speedo's that I have looked at, there is not a solid connection between the cable and the needle. . It is like two disc magnets face to face , with an air gap between them. The disc from the cable side turns and the disc from the needle side trys to keep up thru the magnetic field.
If there is a rough spot somewhere between the speedo gear in the tranny and up to the cable end that screws onto the speedo head, it will cause the needle to bounce. If your inner cable spins freely in the outer cable, then you might check the speedo drive gear in the tranny.. I would think that eventually that plastic gear would wear the teeth....................................MO
-------Original Message-------
Date: 3/23/2015 6:24:41 PM
Subject: Re: Speedometer Lube
Taking the car out for a cruise after lubing the speedo head and cable, there is not much improvement. Symptoms are a little different. Previously the hiccup was just about as regular as a heartbeat. Now it's a little more haphazard but still there. So unless something happens to break, I guess I'll just put up with it.
Paul L.
On Friday, March 20, 2015 at 9:07:58 AM UTC-5, Paul L. http://1962to1965mopar.ornocar.org/ml-le wrote:
While I've got my instrument cluster out of the car I'd like to address a small issue I'm having with my speedo. While driving about every 5 seconds the needle will bounce a little. Usually about 5-10 mph. It will first drop down a few miles an hour and then bounce back up to the correct speed. I have had the speedo cable out and lubed a few years ago first with liquid graphite and then a second time with Vaseline. Neither one ever made any difference. I'm wondering if there is a problem with the speedo head and a way to lube it? I have an extra instrument cluster that I'm going to disassemble later today to get an idea if it's possible. Butwould appreciate any input from someone who may have done this before.
Paul L.
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