RE: Tire Size Conversion

["Gary H." <62to65mopar@xxxxxxxxxxx>]

I thought the speedometer pinions were marked with color: gray, green, 
blue, purple, orange or brown? 

I don't know who sells these now. Imperial Services used to, but 
apparently they are hard to get hold of nowadays.

Gary H. 
 
Bill Maurits wrote:
> 
> OK...now how do I tell which ratio adapter I have? A 1.250 or an
> 0.800? The parts book says that the .8 should only be on a 904 and a
> .8 should only be on a 727, but I want to make sure for myself that I
> do have a .8 unit. Is it marked on it somewhere?
> 
> And who is the best source for these things these days again?
> 
> Thanks
> 
> Bill M
> 65 Coronet 500 'vert
> 
> 
> 
> On 5/18/07, Gary H.   wrote:
> >
> > For your 1965 (or 1962s to 1965's)
> >
> > A. Divide 63.36 by the car's tire circumference. The circumference is
> > tire diameter times 3.14. (e.g.,a 26 inch tall tire has 81.64
> > circumference so 63.36/81.64 = .776
> >
> > B. Multiply that result by 8 (8 x .776 = 6.208)
> >
> > C. Multiply that result by your axle ratio (e.g., 3.23 x 6.208 = 20.05)
> >
> > The result is the number of teeth needed on your car's speedometer
> > pinion, or 20 in the example above.
> >
> > Gary H.
> >
> > Bill wrote:
> > ...
> > > I'm trying to find info on how to convert modern tire sizes
> > > (215/75/14) to the old sizes (D75-14). I ultimately want to figure out
> > > what is the correct speedo gear is for my current setup....
> > 


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