35 Ford Columbia Speedometer?

[jkflathead]

I am about to install the controls for an original Columbia two speed rear end in my '35 Ford coupe. Would it be ok to not install the speedometer conversion assembly under the dash? I understand that the speedometer will be off by 10-12 mph. Other than that is there a problem? I guess that I would have to block off one of the vacuum ports going to that mechanism. Advice? Thanks.

[KGS]

Originally Posted by jkflathead

I am about to install the controls for an original Columbia two speed rear end in my '35 Ford coupe. Would it be ok to not install the speedometer conversion assembly under the dash? I understand that the speedometer will be off by 10-12 mph. Other than that is there a problem? I guess that I would have to block off one of the vacuum ports going to that mechanism. Advice? Thanks.

No problem. I ran mine for quite a while until I got the changer. Just do the math when in overdrive; increase the indicated speed by 30%. BTW, my changer doesn't use vacuum, it's manually changed.

[Kurt in NJ]

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No vacuum ports for the speedometer, it uses linkage for the original system, perhaps you have later control