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Speedometer drive gears 200 1980

uid 27's pic
posted by  Art Benstein on  Tue Dec 8 13:28 CST 2015
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Hi Don,

I had some opportunity to study the parts fiche for the M45 and M46 take-off gears.










Speedometer Drive Gear Part Numbers
teethaxleM45M46
163.151220257--
173.31380978--
183.54380979380754
193.73380980381681
203.911220484380753
203.31--380753


I have some vague recollection that an explanation exists for the 20-tooth gear being used in both 3.31 and 3.91-equipped M46, but I can't recall what it is.

The only two US speedometers I see in both the M46 and M45 applications are those you already mentioned, 0.96 and 0.98. The ratio of those ratios corresponds to the 2% difference between wagon and sedan tires. Not likely to be 10mph at any speed our cars can achieve, but one tooth different at the speedometer take-off could be as much as 7%.
--
Art Benstein near Baltimore

Bakers trade bread recipes on a knead to know basis.






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