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Triumph TR3 - speedometer error

Hello out there:
Does any body out there know what the error would be when using a speedometer from a non-overdrive car with a 3.7:1 rear end on an overdrive car with a 4.1:1 rear end.
Chuck

With the ratios you mention, it may be out by 10.8% on the speed and on the mileage counters.


My speedo broke recently and I sent it to Nisonger, just east of New York City for repair.

Mine speedo has the digits 1180 printed on the front. My TR3A has a 3.7 rear end and overdrive. The crown gear in the diff. has 37 teeth and the pinion has 10 teeth.

My speedo has a gear inside it with 20 teeth for the main odometer as well as for the trip counter. There is a calculation you can do based on a web-site explanation of this.

You will probably have to send it away to have the gears inside changed.

Check all about TR speedos at:- http://ourworld.compuserve.com/homepages/arhodes/speedo.txt

Or you can ask nisonger directly by e-mail at:-

info@nisonger.com

Don Elliott, 1958 TR3A

Don Elliott

This thread was discussed on 14/12/2001

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