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Thread: swapped out 3:55 gear to a 4:10 gear now speedometer is reading a faster speed.

  1. #1
    Join Date
    May 2009
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    oklahoma
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    3

    Cool swapped out 3:55 gear to a 4:10 gear now speedometer is reading a faster speed.

    swapped out 3:55 gear to a 4:10 gear now speedometer is reading 10 mph faster.
    Need info on how to correct speedometer reading error.

  2. #2
    Join Date
    Apr 2010
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    South Florida
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    1,456
    You need a hand held tuner.


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  3. #3
    Join Date
    Oct 2010
    Location
    Michigan
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    1,843
    ^^^What he said^^^
    2004 Black Marauder: #2237 Born on 4/1/2004

    Eaton Swapped and a bunch of other goodies!

  4. #4
    Join Date
    Jul 2014
    Location
    NY
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    1,147
    Reach out to Marty from mosspeedshop.com for a tune. He is a member here. A tune will correct the speedometer issue and will make the shift points a lot better. You will be very happy you did.

  5. #5
    Join Date
    Jun 2011
    Location
    Northeast OH
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    7,493
    You need a SCT xcal 3 or 4 and a tune..see Marty O as mentioned. He can set you up with all
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  6. #6
    Join Date
    Feb 2007
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    over here, with the 40's of beer.
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    swapped out 3:55 gear to a 4:10 gear now speedometer is reading a faster speed.

    Or, with a pass through device and a editor, you can edit the as built in the byte map and adjust from there, just 1’s and 0’s...


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  7. #7
    Join Date
    Mar 2008
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    Meh. These will correct it.




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