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  1. #1

    Default speedo/anti lock adjustments

    I am going to install new wheels and tires 285/75/17 on my 07 NBS 4x4, should I take it to the dealer to have the speedo and anti-lock brakes systems adjusted. I have seen on the site that people have had some problems with these basic mods. Do I need to worry about this or not. Any help would be great.
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  2. #2


    Yes you do need to reprogram the speedometer. The reprogram will cover the ABS as the computer uses the VSS input <vehicle speed> for the ABS.
    You can buy an aftermarket re-programmer to do this. There are many available so do some searching here in the archives.

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  3. #3


    I know when my friends put tires that size on their duramax's they said the brakes felt squishy. I don't know if the reprogram would help with that though...
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  4. #4

    Default Thanks everyone

    Thanks for the replies. Does anyone know how much the dealer charges.....I cant see buying a programmer for a one time need unless its cheap. I know there is a lot you can do with the programmer but I probably will not have another use for it.

  5. #5
    Jr. Engineer
    Join Date
    Jan 2009
    Rochester, MN


    I buy and sell used Programmers and I bought one last week where the guy had the receipt for going to the dealer that listed 1-reprogram for bigger tires and 2-update computer (which I'm guessing was just because they were reprogramming for the bigger tires anyway and I have no idea why he did this if he had a programmer) and I think the total bill was like $150. Might as well just buy a programmer for that price.

    about your brakes feely squishy comment, it is probably just because they put bigger tires on which will decrease your braking performance.
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  6. #6


    the bigger tires will affect your breaking cuz of the extra weight. i dont know how they would help that through the computer tho
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  7. #7

    Cool speedo/anti lock adjustments

    Id go with a aftermarket programmer so you can adjust more than just the speedo/abs.

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