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Topic: Speed odometer cable

in Forum: C3 General Discussion


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Speed odometer cable

Posted: 6/25/06 10:19pm Message 1 of 6
ossw1
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Hi maybe somebody can help me with this. The speed needle keeps jerking back and forth its not steady. What would cause this?


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Speed odometer cable

Posted: 6/26/06 3:53am Message 2 of 6
Ron 78
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BINGHAMTON, NY - USA
Joined: 7/19/2003
Posts: 3808
Vette(s): ......
the cable needs to be greased or replaced


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Speed odometer cable

Posted: 6/26/06 6:25am Message 3 of 6
ossw1
Former Member
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
That's what thought might be going on. How hard is it to replace the cable?


Speed odometer cable

Posted: 6/26/06 6:34am Message 4 of 6
Brint77
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Cuyahoga Falls, OH - USA
Joined: 4/18/2006
Posts: 20
Vette(s): 1977 Corvette, 350 C.I., Light Blue

I just replaced the cable on my car and it was fairly easy.  Its under Speedometer Failure in Interior I think that would help you.

-Brint

Brint7738894.2821180556


Speed odometer cable

Posted: 6/26/06 11:22am Message 5 of 6
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20229
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
It could be the cable needs lubed, or is kinked somewhere, OR...it could mean that the speedo gear(s) are worn. Check the cable first for no kinks/sharp bends, lube it, and see how it works. Then, if it is still jumpin, you should check the condition of the two speedo gears.


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Speed odometer cable

Posted: 7/2/06 5:18am Message 6 of 6
78SEvette
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Holland, OH - USA
Joined: 11/29/2004
Posts: 217
Vette(s): 1978 Silver Anniversary Edition

   While you are doing your inspection, check to make sure that the end that mounts to the tranny is in good shape and not ovaled out. I had the same symptons in my 78. Lubed it didn't work replaced the cables didn't work. Whilw I was checking the speedo gear in tranny, I noticed that the housing that mounts to the tranny was ovaled out allowing the cable to mis-align the speedo gear drive. I replaced the cable housing and all is good. Woeks like new.

Jim




in Forum: C3 General Discussion


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