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Speedometer pinion colour

Posted: Fri May 30, 2014 2:23 pm
by pingis
Today I am cleaning a gearbox so I can replace the old one which is very hard to shift from second and fourth gears to neutral. While cleaning the "new" gearbox I noticed the nut that holds the speedometer pinion is bright red as a London double decker. Are these nuts colour coded showing what end gear ratio they fit? Our 1957 Moggy has a kmh speedometer. The donor car is slightly younger but also had the 948 engine and a "smooth case".