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  • 1965 - 1973 Classic Mustangs -General/Talk-
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what speedometer gear do I need?

  • Thread starter Thread starter jerry S
  • Start date Start date Apr 12, 2011

jerry S

New Member
Sep 3, 2003
1,365
1
0
52.22N 5.12E
Apr 12, 2011
#1
  • Apr 12, 2011
  • #1
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
 
C

cobraii351

Founding Member
Jan 10, 2000
1,104
4
39
Altoona, PA
Apr 12, 2011
#2
  • Apr 12, 2011
  • #2
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
 
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