speedo/anti lock adjustments

**bob13** · 03-12-2009, 02:09 AM

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.

**Jimmiee** · 03-12-2009, 08:09 AM

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.

**95CTburb19** · 03-12-2009, 01:23 PM

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...

**bob13** · 03-12-2009, 11:00 PM

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.

**mjalstad** · 03-13-2009, 12:07 AM

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.