Noisy Speedo - Impala Tech
Troubleshooting Diagnosing problems

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post #1 of 4 (permalink) Old 10-11-2018, 06:48 PM Thread Starter
Join Date: Sep 2010
Location: USA
Posts: 65
Noisy Speedo

Every now and then I hear an annoying grinding sound and the speedometer needle on my '63 Impala starts jumping around wildly while driving. Then it returns to normal and the sound disappears. Could that be an indication that my speedometer cable is loose or beginning to fail or, perhaps, something worse down in the tranny?
Hal is offline  
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post #2 of 4 (permalink) Old 10-11-2018, 07:21 PM
Join Date: Jan 2006
Posts: 12,923
In the tranny no. In your speedometer cable, or the odometer itself, yes.

The speedometer cable is easy to pull, inspect, clean, and relube with dry graphite powder. The Odometer may require disassembly of the dash to get to, and a used one to replace it with, as I doubt you will find any one to repair what you have.

It could be the nylon plastic gear set in the transmission that drives the cable that is going bad; as plastic does wear. You can replace them with aluminum gears out of a pick-up truck or another set of plastic ones but it requires removing the tail housing to get to the drive gear.

Big Dave
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post #3 of 4 (permalink) Old 10-12-2018, 03:08 PM Thread Starter
Join Date: Sep 2010
Location: USA
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Thanks Big Dave!
Hal is offline  
post #4 of 4 (permalink) Old 10-13-2018, 10:52 AM
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Join Date: Dec 2012
Location: virginia
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Dave hit all the likely offenders. Your symptoms point to a 'lub' problem. As Dave said, lub with the graphite.
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