what speedometer gear do I need?

[jerry S]

I have a C6 auto in my Mach 1 with the following forward gearing

1st gear = 2.71
2nd gear = 1.53
3rd gear = 1

and a 3.70 rear axle ratio

I have 16x8 wheels and am running 235/50-16 tires in the rear (for now). Those rear tires will be changed out to 245/50-16s the next time around. I think the C6 has 6 teeth on the drive gear. If I have done my cipherin and figgerin correctly, I need a 17 tooth driven gear, which ain't available, so I have to choose between 16 and 19. With 16 being closer to 17 than 19, I think I need one of those (TCI tan color). Can anyone confirm?

thanks

 

[cobraii351]

With a 6 tooth drive gear and your new tire sizw 17 would be the closest. And sure they make a 17 tooth. SPEEDOMETER GEAR LH ROTATION 17 TOOTH 1964-1973 | CJ Pony Parts

Tim