I looked in my stash of parts and found one speedometer head unit that was as close as possible to what mileage I had and went from there. Or don't worry about it at all. In PA old vehicles are exempt from mileage statements as they can not be confirmed accurate. I mean a 35 year-old vehicle...
Probably the speedo head unit is bad. That is my guess. I had some scream and go almost 1/2 way around the second time. Lubed the head unit on a few and replaced the speedo head on a few more. Common issue on old vehicles.
Check out this thread. I used cable a chain lube, grease, oil what ever was available. No special recipe. Just something clean and greasy. I looked quick to see if I still had the tube and didn't see it. But good...
You don't need the bottom loose to pull or install the inner cable. I done it many times. It can be a little tricky but nothing a few twists and turns won't quickly resolve. And when I said lube it silly I meant just that. Push it in and out a few times to get the lube thru and thru. Good Luck.
Yes it can be done. I would not tell you to do it if it can't be done. They make speedometer cable lube. I also use cable lube and light grease. But speedometer cable lube worked best. Good Luck. Report back. Be Safe.
Pull the cable out thru the top behind the speedometer head and get some speedometer cable lube and grease that thing silly. But yes replace the gear. If you have issues I probably have a few around here. Enjoy the weekend. Be Safe and Take Care.
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