Quote Originally Posted by joeybsyc
Thanks, but how would I know how many "speedometer revolutions per mile" i need to type into that chart? And is the plastic color coded gear the drive dear or the driven gear? My car has a 30" tall tire and a 3.00:1 rear end ration btw.

Type in 1000 ...

There are 4 different gears available for the driver ( the output shaft ) and they are either a 7, 8, 9, or 10 ...

With your rear in the ( 3.00 ) ... and your tall 30 inch tires ... you need the driver/driven ratio to be 2 to 1 ...

That means ... the number on the driven ... needs to be 2 times what is on the output shaft.

If your output shaft has a 7 on it ...
You need a 14

If your output shaft has a 8 on it
You need a 16

If your output shaft has 9 on it
you need a 18

If your output shaft has a 10 on it
You need a 20



There are no 14 tooth and 16 tooth available
The available driven gears are 17, 18, 19, 20, 21, and 22
So you need at least a 9 on the output shaft ...

I suggest a new bullet also ...