I am getting a chirping sound from my speedo.  Do you just replace the cable from the CC to the Speedo or is there a way to lube it? It's kinda jumpy also.  Thanks, Tom  

There is a grease fitting attachment you can buy, can't remember where I got mine, I will try to figure it out. It goes on the end of the cable to grease it. Or you can remove the inner cable and lube it by hand.

I had the same problems with my 79. I would first take the cable out clean it and lube it. Make sure there are no kinks. The problem may be in the speed odometer it's self. My speed odometer made the same sound, waved and finally pegged over to max. I had to send it out to have it re-built, works OK now.

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Here's the tool. Just be sure to use a lightweight grease...not a heavy wheel bearing type. The white lithium would be best, but I doubt you can find that in a grease-gun size.
While this may not be the best solution, since ya don't know how much grease yer putting in, it IS a lot easier/quicker than removing the speedo cable from the speedo head to get the inner cable out...
Plus, this will let ya put some lube on the cable, whether it fixes the noise/bounce or not....

Will this work on the speedo cable coming from the cruise control?  The instructions for the lubricator say it's for use on the trans end and also is for 62-74 Vette's.  Wonder if it's okay to use on an 81'?  Thanks,  Tom

THe fittings from the CC to the speedo head are a different thread...smaller, I think, than the regular speedo cable fittings, but...with a little ingenuity, it could be made to work....or you could just dis-connect the cable from the speedo head, and do it that way, without buying the tool. It's just such a pita to get the cable disconnected most of the time. At least, for me it is...but I'm lazy....

    Make sure you disconnect both endas of the cable if u use this tool. I've seen people "hard pack" grease in the cable sleeve and that does no good at all. I prefer to remove the cable. That way, I can inspect it to make sure there is no damage to the cable. Clean the cable with brake cleaner, dry it off real good, hand lube it and re-install. Before I connect it, I usaully use the drill test to make sure it's working right and the lube is distributed and re-connect it. Hope this will help.

I replaced my lower cable last year. It was not easy, but doable.

I had to lube mine about 3 years ago and have had no problems with it since.  It also stopped the jumping as well.