RE: Speedo Gear color code ??

[ledman_70@xxxxxxxxxxx]

Have you tried Brewer's Dan? They carry a few.

Dan McCormack wrote:
> 
> Well I checked both my 63 and 64 Plymouth FSM and this gets even more 
> confusing. It seems like manual & automatic and V8 and 6 cyl. trannys 
> use a different number of teeth for the speedo gear. I'm not sure what 
> the difference is between the manual and automatic but the 6 cyl. tranny 
> 
> has 7 teeth on the output shaft and the 8 cyl. tranny has 8 teeth on the 
> 
> output shaft. It shows the number of teeth needed with a 700 x 14 tire 
> which is 26.80" in diam. (sound familar Rich?) and a 3.91 rear end 
> (manual V8 tranny) as a 19 tooth dark blue but... there's also a sub 
> note that says with this combo to use a .9058:1 ratio adaptor. (Mopar 
> made ratio adaptors???????) It shows a 21 tooth gray for the 3.55 rear 
> end. I guess the 21 tooth is as close as your going to get unless you 
> can find one of those ratio adaptors or use a slightly taller tire.
> 
> This sure is a lot more confusing than the 66 and up gears which I'm 
> familar with. I discoverd years ago that if you have a stock height tire 
> 
> of about 27" that the speedo gear teeth (66 and up) will match the first 
> 
> 2 numbers of the rear end ratio. For example a 3.23 uses a 32 tooth gear 
> 
> and a 3.91 uses a 39 tooth gear ect. If you have smaller dia. tires you 
> need more teeth and if you have taller dia. tires you need less teeth. 
> That last statement should be true for the 65 and older gears too.
> 
> Dan



Jeff Adams
64 Polara


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