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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.
    The diference between stupidity and genius is that genius has limits.

    2007 NBS Silverado
    LT2 Z71
    2.5" Levelling Kit
    Hood Stripes
    Chrome Grill
    GM Bed Liner & Tonno
    Dick Cepek Rims 18X9
    Hankook RF10 Tires 275/65/18
    De-Badged Tailgate

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  2. #2

    Default

    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.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3

    Default

    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...
    Dan
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

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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.
    The diference between stupidity and genius is that genius has limits.

    2007 NBS Silverado
    LT2 Z71
    2.5" Levelling Kit
    Hood Stripes
    Chrome Grill
    GM Bed Liner & Tonno
    Dick Cepek Rims 18X9
    Hankook RF10 Tires 275/65/18
    De-Badged Tailgate

    More Mods Coming

  5. #5
    Jr. Engineer
    Join Date
    Jan 2009
    Location
    Rochester, MN
    Posts
    231

    Default

    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.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  6. #6

    Default

    the bigger tires will affect your breaking cuz of the extra weight. i dont know how they would help that through the computer tho
    PETE
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
    5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust


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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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