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Synchro909 · 08-02-2017, 07:06 PM

I didn't want to hijack SSssteamer's thread on the same subject so I started this one.
Firstly, some background. My 1930 CCPU is fitted with a 26% Mitchell O/D and 3.78 diff but the speedo reads about 16-17% fast. Clearly, the speedo drive gear should be about that % larger. The O/D, I believe comes fitted with an 18 tooth gear but for some reason known only to the previous owner, it has a 17 tooth gear in it. By my calculations, I need a 20 tooth gear (black). I plan in fitting a 3.54 diff to it soon and for that, I'd need a 19 tooth gear (pink).
The cost of freight from the US is stupid, as has been discussed here recently so I am hoping that armed with the right information, I might be able to buy them here. I am lead to believe that Mitchell uses gears etc from a more modern Ford gearbox in their O/Ds. If so, which one and even better, does anybody have a part number please?

08-02-2017, 07:06 PM	#1
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 8,043	Speedometer drive gears I didn't want to hijack SSssteamer's thread on the same subject so I started this one. Firstly, some background. My 1930 CCPU is fitted with a 26% Mitchell O/D and 3.78 diff but the speedo reads about 16-17% fast. Clearly, the speedo drive gear should be about that % larger. The O/D, I believe comes fitted with an 18 tooth gear but for some reason known only to the previous owner, it has a 17 tooth gear in it. By my calculations, I need a 20 tooth gear (black). I plan in fitting a 3.54 diff to it soon and for that, I'd need a 19 tooth gear (pink). The cost of freight from the US is stupid, as has been discussed here recently so I am hoping that armed with the right information, I might be able to buy them here. I am lead to believe that Mitchell uses gears etc from a more modern Ford gearbox in their O/Ds. If so, which one and even better, does anybody have a part number please? __________________ I sometimes wonder what happened to the people who asked me for directions. Even at my age, I still like to look at a young, attractive woman but I can't really remember why.