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M41 Speedo gear application 1800

uid 5322's pic
posted by  alschnertz on  Mon Jun 23 14:12 CST 2003
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last visit: Fri Oct 24 10:32 CST 2014
[RELATED]

Matt,
I appreciate the input. I find speedometer errors annoying. Near as I can tell, if indeed the M41 did come from a 4.10:1 car, I'll be in business. I also think in that case the speedometer error will be almost nothing.

My calculations indicate about a half mph difference at 67 mph between a 4.10:1 with standard 165x15 tires (the 1800) and a 4.30:1 with the taller 195-75x15 tires (my 145.) I was surprised how close in diameter the 195-75x15 is to the original equipment 6.85x15 tire.

I'm getting way to detailed, I don't think the old speedometers were always on the money anyway. Still it is an interesting thought.
In any case, I do have a 4.10:1 axle out back somewhere....

Regarding your 122, my books show an overdrive used with a 4.56:1 in 60's 1800s from the factory, so there must be a correct gear out there somewhere. Although I guess that would not be on a "J" type.

Thom





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