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I need some help. I have a 69 RS with a newer 350 and TH350 automatic transmission. My problem is that the speedometer gets stuck at 80 mph and I am sure I am still accelerating. Does anyone know how to fix this or how to adjust it if I get bigger tires and wheels. Thanks
 

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If your speedometer otherwise works normally (no jumping, bouncing, etc.) below 80 mph but sticks at 80, chances are it's a problem in the mechanism inside the speedo head that a speedo or instrument shop will have to get into.

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JohnZ
'69 Z28 Fathom Green
 

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Mine bounces what dose that mean cable is well oiled and is not kinked
 

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If the pointer does not stay steady, the cable is going south. My 57 had a jumpy needle for many years before the cable let go. Lubrication is not the answer, tried that too.

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57 Plymouth Savoy in my family since new, just cosmetically restored, 93 S-10 waiting on the 80 Dodge Lil' red Express clone truck to be built then one s_10 for sale, Angie's mechanic and designated Vette cusser.
 
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