[BA.]

So what causes this to randomly happen for a bit and then stop and be pretty steady again ?

Its happened about 4 times this year.
Earlier this year, once, it pegged at 120 for about 30-60 seconds.

Otherwise its pretty steady, sometimes a +/- 2mph sway.

20221006_095922.mp4

drive.google.com

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[62BillT]

I would check over the Cable.

 

[craig32]

Lube the cable, it's about to break. Used to be 3 in 1 oil, something light like that. When it gets 10 jumping about 10 MPH, it's soon going to break.

 

[BA.]

The curious bit is that this cable only has around 5000 miles on it and it was indeed lubed with a lot of graphite when it was put in. The randomness of the issue had me wondering if a brittle/old speedometer gear might be a cause more than lube on a new cable. eg. could a small part of a plastic gear broken off at that end. I've never heard of that happening but it seemed plausible.

This has been going on for a year and a few thousand miles now. Well, off-and-on, right, like noted above.

 

[62BillT]

If the Cable is fine, it almost has to be the Speedometer itself. I doubt it would be a Transmission problem. If it's not really an issue, you may want to just wait till it breaks. Maybe have a replacement ready in case it does.

Extra note on the Cable Lube though, I believe we would use Chassis Grease in ours.

 

[japete92]

The one time (back in 1960 something) I lubed the speedo cable (because the needle was 'jumping and making a real racket) I used liquid graphite. I was told oil was incorrect but I do not remember why.

The liquid graphite solved my problems.

Pete

 

[65_&_67_Impala]

Speedometer Cable Lube - CorvetteForum - Chevrolet Corvette Forum Discussion

C3 General - Speedometer Cable Lube - Bouncing needle. I lubricated with white lithium grease as recommended by many and it made it worse...to the point of making noise in the gauge at more than 50 mph. So I pulled the inner cable, wiped it off, ran it in several more times to remove as much of...

www.corvetteforum.com

How to Properly Lubricate a New Speedometer Cable

Speedometer cables can be annoying, especially when you notice the crazy gyrations coming from the speedometer needle that jumps, skips or does not move at all. The problem looks serious and might lead someone to think that the engine can be at fault. In reality, the problem almost always lies...

itstillruns.com

Dorman Products - 04369

Flywheels and Flexplates

www.dormanproducts.com

https://bobistheoilguy.com/forums/threads/speedometer-cable-how-to-lubricate.323687/

https://www.napaonline.com/en/search/oil-and-chemicals/lubricants-and-penetrants/lubricants/speedometer-cable-lubricant/210975990

 

[Accelo]

Worn plastic gears will also cause this issue. Pull the speedometer slug from the tails shaft and inspect. Confirm the drive gear isn't spinning on the shaft and the teeth are in good shape.