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Thread: Speedo gear

  1. #11
    Aspen and Volare Member Moparqueen's Avatar
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    Sounds good, we just put new tires all the way around and need to see where speedo is at. It was off about 10 with 245/60/15 now we are running 275/60/15 in the rear. We have 355. Maybe you would know. Will take out this week to see and let you know

  2. #12
    Aspen and Volare Super Moderator aspen79's Avatar
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    There are charts to calculate the speedo gear teeth needed using tire diameter and rear gear ratio.

    Best way to get tire diameter is to check the manufacturers website or vendor. Summit lists the diameter with the other tire specs for example. Trying to measure with a tape is hit or miss if you'll get the actual number.

    http://enthusiast.yearone.com/faqs/t...do-gear-chart/
    Last edited by aspen79; 06-22-2016 at 08:04 PM.
    1979 Aspen Sunrise 500". Bought in 1987 with 72,000 miles and a mighty E24 California emission 90hp leaning tower of power/4-speed
    1996 Dakota with a torque monster (not) 3.9L V-6 and automatic owned since 1998. Now demoted to winter duty
    2008 Ford Mustang V6, the new summer daily driver

  3. #13
    Aspen and Volare Super Member 77rr2x4s's Avatar
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    Is it reading too fast or too slow? What tooth gear is in there now?

  4. #14
    Aspen and Volare Member Moparqueen's Avatar
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    Too fast, don't know what gear is in it now. Guess i should check.

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