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36threewindow

36threewindow

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Synchronizing speedometer

This question ranges from 1936 to 1965 so I'm putting under modified.

 I have 1936 Buick series 40 3 window coupe which had the 230 ci engine and 3speed manual trans and have replaced that with a 1965 Buick 401 nailhead (rebuilt stock) using a mating 65 THM400 with switch pitch trans. Using the original gauges & speedometer and cable. The speedometer reads 10 mph at standstill with  engine running and I,m sure off at all speeds but just got it to wher it is driving and only a few short trips while workng some bugs out.

 I know there is a gear in the trans that attaches to the speedometer cable can anyone tell me what size gear I need to change that too to bring it into sink with cable & speedo. Or is there more to it ?

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Use a GPS app on a smart phone to find out how much your off. Then most transmission shops can set you up with the right gear.

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