Speedometer cable question

[jason999]

Hello,

I installed a new speedometer cable on my 1966 C10 with original gauges and a turbo 350 transmission. I greased the cable and checked for binds but it still made a ridiculous kind of honking noise at times when I picked up speed.

Yesterday, I unscrewed the cable thumbscrew from the gauge slightly (2 turns?) and the noise stopped!

So I am thinking that the inner cable is slightly long. At first I was going to add a rubber washer inside of the thumbscrew that attaches to the gauge. I thought that I could tighten it down and still leave the space that it seems to need.

After thinking about it, I believe that I could probably just disconnect the cable from the transmission and cut a very small amount off of the cable. I would obviously trim from that end because the gauge end has the fitting. I believe the cable is a little long at the transmission end and it is forcing more cable out of the gauge end than it needs, resulting in the noise.

Does that sound correct?

Maybe I could just leave the thumbscrew a little loose but I would rather tighten it.