VCCA Home Forums Thread Like Summary - 1931 Speedometer cable leaking at transmission

1931 Chevrolet - My Speedometer cable is leaking where it connects to the transmission. The connection seems tight and the speedometer works fine.
Are there any seals or other methods to prevent leaking? I'm using 600W oil.
If required, where can I get parts? Thanks

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If you find that it is actually the cable and not the fitting that is leaking, I used adhesive lined shrink tubing to cure the leak I had on the cable and at the joint with the cable and the ferrule. The cable stays flexible and leak free.

originally there was only a round felt washer.

main reason for leaks is overfilled transmission.

also make sure that your speedo cable goes UP HILL away from transmission, it it SLOPES DOWN then fluid will find its way !! once it starts weeping hard to stop.

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Hello jtrue,
Dave39MD is probably correct about a leaking oring or other seal within the screw-on speedo cable cap. In order to be sure of where the leak is at, clean (brake clean) and dry in a good size area around the speedo connection. Verify the transmission is properly serviced with lube. Go for a short drive. Dust speedo area with talcum/baby/foot/whatever powder for the true location of the leak. With lube migrating everywhere, it's hard to tell what is leaking. Maybe the cap is cracked or deformed from excessive tightening, maybe somewhere else.

I used an o ring inside the cap that screws on to the transmission. I think there was an old piece of felt or cork inside when I started.

Dave