Got the new starter in my CD. This morn I drove to the post office.
It made a very weird noise, starting at about 5-10 mph, a whooping sound> woop woop woop wooping, faster as I accelerated. At 40 45 mph was SO loud I expected others on the road to notice, but no. Opened windows, no sound from outside.
I reached up & put back of my fingers on insturment panel, my fingers literally were bouncing off the inst panel. Got home 'bout an hour ago, will remove panel tomorrow & see what I can see, hopefully something simple.
Anyone else have similar issues??

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"I applaud your elaborate system of denial"

Speedometer cable? Would change speed while accelerating and is in contact with the instrument cluster.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

X2 ^^^ .... Don't drive it a lot, it may harm the speedo gear in the transmission from the extra friction/resistance.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Can the actual cable itself be replaced, or must the whole assembly be replaced, end to end?

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"I applaud your elaborate system of denial"

The cable can be replaced if the housing/casing is in ok condition. If the cable looks ok they can often be thoroughly cleaned, the casing flushed with a solvent and the cable sparingly lubed with lithium grease. Lube the upper foot of the cable very sparingly to prevent the grease from getting into the speedometer head.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

I'd disconnect the cable and see if the noise goes away before doing anything else...

Good advice X2^^^

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer