If you will check the parts manual, it will show a rear end ratio of
3.545 for non overdrive cars and 3.90 for those fitted with overdrive.
John
64/66 BJ8s
On 5/15/2011 4:25 PM, Per Schoerner wrote:
> Hi
> I'm trying to figure out the speedometer drive gearing inside the
> different gearboxes. I'm helping a friend with his speedometer. He has
> a 100-6 which was delivered without overdrive. My own car is a 3000
> mk2 with overdrive. The rear axle gear ratio on these cars are the
> same, as far as I understand, according to Clausagers book. But the
> speedometers are different. The 3000 speedometer needs 980 revolutions
> per minute to show 60 (MPH) and advance the odometer 1 mile in one
> minute. The 100-6 speedometer needs 1575 revolutions per minute to do
> the same thing. Note that both cars are imported from the states, so
> both are speedos are in miles.
> Does anyone know what the difference is? Well, I can calculate it of
> course, but I thought asking on the list would be safe in case I have
> got something wrong.
>
> Best regards, Per from Sweden.
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