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1957 Chevy Bel Air Sport Coupe
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Discussion Starter · #1 ·
Does anyone know if there should be an o-ring in the end of the speedo cable housing that screws onto the transmission? If so, what size would the o-ring be? (700R4 trans, stock 1957 speedo cable) Also can a person use thread sealer or teflon tape on the fitting to prevent any leakage?

Thanks
Doug
 

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Trifive Automotive Electrical Wiring Expert
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27,084 Posts
There is no O-ring or thread sealer needed on the speedometer cable. The speedometer drive is sealed by the housing to the gear in the transmission.
 

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Don mean to hijack this thread, but can you post pictures of where the speedo cable is on the tranny? Also is it hard to replace? Where is it at behind the speedometer and do I have to remove stuff to get it off?
 

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The "plug" that goes in the transmission has an o-ring, but the cable attachment does not. There should also be a seal on the gear itself, again part of the plug assembly, not the cable.

Think of it this way, if you didn't connect the cable, there should be no leak.
 
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