Author Topic: Speedometer problems  (Read 2506 times)

kansascdr

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  • Posts: 7
  • Gender: Male
  • Mustang: 68 coupe
  • Daily driver: 1968
  • Location: Kansas
Speedometer problems
« on: March 18, 2011, 08:52:47 PM »
I changed the rear end in my 68 coupe years ago and the speedometer was always way off. It is a 3:5 to 1 with standard 14 inch tires. The problem is when I am doing 45 by the speedometer I am really doing 65. At 50 it is really 70 and at 60 it is really 85. I replaced a 16 tooth speedometer gear with 19 tooth and it is worse. How can I figure this out? Do I need more teeth or less?

TheJ

  • Full Member
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  • Posts: 93
  • Gender: Male
  • Mustang: 1973 Mach 1
  • Daily driver: 1993 Dodge Shadow
  • Location: Wisconsin
Re: Speedometer problems
« Reply #1 on: March 19, 2011, 11:43:48 AM »
Here are a couple of speedometer gear calculators.

http://home.mchsi.com/~jroal/drive.htm

http://www.classic-cougar.com/tools/speedocalc/speedocalc.php

Hope this helps.

 

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